P1516

Code

BUICK P — Powertrain

Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Brand: BUICK

Type: P — Powertrain

Views: UK: 43 EN: 91 RU: 58

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1516

CADILLAC P — Powertrain

Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Brand: CADILLAC

Type: P — Powertrain

Views: UK: 43 EN: 101 RU: 60

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

Repair manuals

Manual library for CADILLAC

206

Browse 206 CADILLAC manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

CADILLAC

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Code

P1516

CHEVROLET P — Powertrain

Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Brand: CHEVROLET

Type: P — Powertrain

Views: UK: 49 EN: 91 RU: 60

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

Repair manuals

Manual library for CHEVROLET

917

Browse 917 CHEVROLET manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

CHEVROLET

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Code

P1516

CHRYSLER P — Powertrain

Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Brand: CHRYSLER

Type: P — Powertrain

Views: UK: 47 EN: 86 RU: 58

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

Repair manuals

Manual library for CHRYSLER

193

Browse 193 CHRYSLER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

CHRYSLER

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P1516

FORD P — Powertrain

Intake Manifold Runner Control Input Error

Brand: FORD

Type: P — Powertrain

Views: UK: 43 EN: 107 RU: 60

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

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Code

P1516

Generic P — Powertrain

IMRC Input Error (Bank 1)

Brand: Generic

Type: P — Powertrain

Views: UK: 43 EN: 93 RU: 69

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1516

GM P — Powertrain

Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Brand: GM

Type: P — Powertrain

Views: UK: 49 EN: 95 RU: 61

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

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Code

P1516

GMC P — Powertrain

Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Brand: GMC

Type: P — Powertrain

Views: UK: 50 EN: 169 RU: 66

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1516

HUMMER P — Powertrain

Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Brand: HUMMER

Type: P — Powertrain

Views: UK: 33 EN: 76 RU: 47

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

HUMMER: 201012
- H36
- H3T6
HUMMER: 200924
- H24
- H314
- H3T6
HUMMER: 200818
- H24
- H314
HUMMER: 20078
- H24
- H34
  - Automatic
  - Automatic
  - Standard
  - Standard
HUMMER: 20054
- H24
HUMMER: 20046
- H12
  - 2004 H1
  - 2004 H1
- H24
HUMMER: 20034
- H12
  - 2003 H1
  - 2003 H1
- H22
  - 2003 H2
  - 2003 H2
HUMMER: 20022
- H12
  - 2002 H1
  - 2002 H1
HUMMER: 20018
- H18
HUMMER: 20004
- H14
HUMMER: 19994
- H14
HUMMER: 19988
- H18
HUMMER: 19978
- H18
HUMMER: 199612
- H112
HUMMER: 19958
- H18
HUMMER: 19944
- H14
HUMMER: 19934
- H14

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Code

P1516

JAGUAR P — Powertrain

Gear Change Neutral Drive Fault

Brand: JAGUAR

Type: P — Powertrain

Views: UK: 46 EN: 98 RU: 62

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1516

LAND ROVER P — Powertrain

Failure in the activation in park / neutral

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 30 EN: 66 RU: 43

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

Repair manuals

Manual library for LAND ROVER

413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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Code

P1516

LINCOLN P — Powertrain

Intake Manifold Runner Control Input Error

Brand: LINCOLN

Type: P — Powertrain

Views: UK: 48 EN: 93 RU: 58

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

Repair manuals

Manual library for LINCOLN

166

Browse 166 LINCOLN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LINCOLN

LINCOLN: 202425
- Aviator7
- Corsair5
- Nautilus6
- Navigator7
  - Black Label
  - L Black Label
  - L Livery
  - L Premiere
  - L Reserve
  - Premiere
  - Reserve
LINCOLN: 202332
- Aviator9
- Corsair5
- Nautilus6
- Navigator12
LINCOLN: 202234
LINCOLN: 202130
LINCOLN: 202045

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Code

P1516

MAZDA P — Powertrain

Gear Change Neutral Drive Fault

Brand: MAZDA

Type: P — Powertrain

Views: UK: 45 EN: 92 RU: 59

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

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Code

P1516

MERCURY P — Powertrain

Intake Manifold Runner Control Input Error

Brand: MERCURY

Type: P — Powertrain

Views: UK: 48 EN: 119 RU: 77

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

Repair manuals

Manual library for MERCURY

296

Browse 296 MERCURY manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MERCURY

MERCURY: 201118
- Grand Marquis2
  - 4.6 V
  - 4.6 W
- Mariner10
- Milan6
MERCURY: 201022
- Grand Marquis2
  - 4.6 V
  - 4.6 W
- Mariner10
- Milan6
- Mountaineer4
MERCURY: 200928
- Grand Marquis2
  - 4.6 V
  - 4.6 W
- Mariner10
- Milan8
- Mountaineer4
- Sable4
MERCURY: 200828
- Grand Marquis4
- Mariner8
- Milan8
- Mountaineer4
- Sable4
MERCURY: 200727
- Grand Marquis4
- Mariner6
- Milan8
- Montego4
- Monterey1
  - 2007 Monterey
- Mountaineer4
MERCURY: 200625
- Grand Marquis4
- Mariner6
- Milan6
- Montego4
- Monterey1
  - 2006 Monterey
- Mountaineer4
MERCURY: 200526
- Grand Marquis6
  - GS
  - GSL
  - Limited Edition
  - LS
  - LSE
  - Ultimate Edition
- Mariner4
- Montego4
- Monterey1
  - 2005 Monterey
- Mountaineer6
- Sable5
MERCURY: 200416
- Grand Marquis2
  - GS
  - LS
- Marauder1
  - 2004 Marauder
- Monterey1
  - 2004 Monterey
- Mountaineer6
- Sable6
MERCURY: 200320
- Grand Marquis3
  - GS
  - LS
  - LSE
- Marauder1
  - 2003 Marauder
- Mountaineer4
- Sable12
MERCURY: 200228
- Cougar3
- Grand Marquis3
  - GS
  - LS
  - LSE
- Mountaineer6
- Sable13
- Villager3
MERCURY: 200129
- Cougar4
- Grand Marquis2
  - GS
  - LS
- Mountaineer4
- Sable16
- Villager3
MERCURY: 200029
- Cougar3
- Grand Marquis2
  - GS
  - LS
- Mountaineer4
- Mystique6
- Sable11
- Villager3

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Code

P1516

OLDSMOBILE P — Powertrain

Throttle Actuator Control TAC Module Throttle Actuator Position Performance

Brand: OLDSMOBILE

Type: P — Powertrain

Views: UK: 42 EN: 94 RU: 58

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

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Code

P1516

Other P — Powertrain

IMRC Input Error (Bank 1)

Brand: Other

Type: P — Powertrain

Views: UK: 42 EN: 94 RU: 57

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

Repair manuals

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Code

P1516

PORSCHE P — Powertrain

Intake manifold resonance flap

Brand: PORSCHE

Type: P — Powertrain

Views: UK: 31 EN: 56 RU: 41

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

Repair manuals

Manual library for PORSCHE

136

Browse 136 PORSCHE manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

PORSCHE

PORSCHE: 202177
PORSCHE: 202059
- 718 Boxster6
- 718 Cayman7
- 718 Spyder1
  - 2020 718 Spyder
- 9118
- Cayenne10
- Macan4
  - 2020 Macan Base
  - GTS
  - S
  - Turbo
- Panamera20
- Taycan3
  - 4S
  - Turbo
  - Turbo S

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Code

P1516

SATURN P — Powertrain

Throttle Actuator Control TAC Module Throttle Actuator Position Performance

Brand: SATURN

Type: P — Powertrain

Views: UK: 51 EN: 102 RU: 64

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

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Code

P1516

SUBARU P — Powertrain

Idle Air Control Solenoid Signal 4 Circuit Low Input

Brand: SUBARU

Type: P — Powertrain

Views: UK: 41 EN: 94 RU: 61

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

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Code

P1516

VOLKSWAGEN P — Powertrain

Intake Manifold Changeover Valve Circuit Open

Brand: VOLKSWAGEN

Type: P — Powertrain

Views: UK: 46 EN: 97 RU: 70

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty electronic throttle body / throttle actuator (TAC) assembly
Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
Poor 5 V reference, ground, or battery/charging system issues
Carbon buildup or mechanical binding in throttle plate
PCM/ECM software bug or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power / limp-home mode
Delayed, erratic or no throttle response to accelerator pedal
Surging or unstable idle
Engine may refuse to increase RPM or sudden loss of power

What to check

Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
Verify battery voltage (should be ≈12–14.5 V) and charging system operation
Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
Check for obvious carbon buildup or mechanical obstruction on throttle plate
Check for TSBs or software updates for throttle control on this model/year

Signal parameters

Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
Good sensor ground (low resistance to chassis ground)
Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

Contaminated or sticking throttle body causing position not to follow command
Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

Repair manuals

Manual library for VOLKSWAGEN

626

Browse 626 VOLKSWAGEN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

VOLKSWAGEN

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