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P1252 — Pedal Correlation PDS1 and LPDS High

Detailed page for trouble code P1252.

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Code

P1252

FORD P — Powertrain

Pedal Correlation PDS1 and LPDS High

Brand: FORD
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or contaminated accelerator pedal position sensor(s)
  • Corroded, loose or damaged wiring / connector to pedal sensors
  • Short to 5V reference or ground on one sensor circuit
  • Poor ground or 5V reference from PCM
  • Intermittent connector contact or water intrusion at pedal harness
  • Failed PCM (less common)

Symptoms

  • MIL/Check Engine light ON
  • Reduced engine power / limp mode
  • Poor or inconsistent throttle response
  • Unexpected engine hesitation or inability to accelerate
  • Possible stored or pending related throttle/pedal codes

What to check

  • Read freeze frame and full scan data; note throttle and pedal sensor voltages/percentages
  • Visually inspect pedal assembly, sensor connectors and wiring for damage or water
  • Check battery voltage and PCM power/ground integrity
  • Backprobe pedal sensor pins and observe voltage while moving pedal
  • Wiggle test harness and connectors while monitoring live data for intermittent faults
  • Check for recent repairs or aftermarket parts that may affect pedal wiring

Signal parameters

  • Typical pedal sensor outputs operate from a 5 V reference; expected operating range ~0.5–4.5 V (manufacturer-specific)
  • Both sensor signals should change smoothly and proportionally as the pedal moves
  • PCM expects a specific correlation between PDS1 and LPDS; a large difference or one stuck at a fixed voltage will set the code
  • Look for shorts to 5 V (stuck high) or to ground (stuck low) and for noisy or intermittent waveforms

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
  2. Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
  3. With key ON (engine off), backprobe each pedal sensor signal, reference, and ground. Verify 5 V reference present and good ground continuity to chassis/PCM.
  4. Slowly operate the accelerator pedal while watching live data for PDS1 and LPDS voltages/percentages. Expect smooth, proportional change. Record values at rest, mid-travel and full travel.
  5. If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
  6. Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
  7. If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
  8. After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
  9. If faults persist after sensor and harness repair, verify PCM power/grounds and consider PCM diagnosis or replacement only after ruling out all wiring/sensor causes.

Likely causes

  • Faulty accelerator pedal position sensor (PDS1 or LPDS)
  • Wiring harness damage at the pedal (pinched, chafed, broken)
  • Connector corrosion or poor pin contact at pedal or ECM/PCM
  • Lost 5V reference or ground to pedal sensors
  • Aftermarket modifications or incorrect pedal assembly replacement

Fault status

⚠️ Status
P1252 — Pedal correlation: PDS1 and LPDS signal correlation high (accelerator pedal position sensors disagreement).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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Code

P1252

JAGUAR P — Powertrain

VSV Stuck On VA/VV

Brand: JAGUAR
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or contaminated accelerator pedal position sensor(s)
  • Corroded, loose or damaged wiring / connector to pedal sensors
  • Short to 5V reference or ground on one sensor circuit
  • Poor ground or 5V reference from PCM
  • Intermittent connector contact or water intrusion at pedal harness
  • Failed PCM (less common)

Symptoms

  • MIL/Check Engine light ON
  • Reduced engine power / limp mode
  • Poor or inconsistent throttle response
  • Unexpected engine hesitation or inability to accelerate
  • Possible stored or pending related throttle/pedal codes

What to check

  • Read freeze frame and full scan data; note throttle and pedal sensor voltages/percentages
  • Visually inspect pedal assembly, sensor connectors and wiring for damage or water
  • Check battery voltage and PCM power/ground integrity
  • Backprobe pedal sensor pins and observe voltage while moving pedal
  • Wiggle test harness and connectors while monitoring live data for intermittent faults
  • Check for recent repairs or aftermarket parts that may affect pedal wiring

Signal parameters

  • Typical pedal sensor outputs operate from a 5 V reference; expected operating range ~0.5–4.5 V (manufacturer-specific)
  • Both sensor signals should change smoothly and proportionally as the pedal moves
  • PCM expects a specific correlation between PDS1 and LPDS; a large difference or one stuck at a fixed voltage will set the code
  • Look for shorts to 5 V (stuck high) or to ground (stuck low) and for noisy or intermittent waveforms

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
  2. Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
  3. With key ON (engine off), backprobe each pedal sensor signal, reference, and ground. Verify 5 V reference present and good ground continuity to chassis/PCM.
  4. Slowly operate the accelerator pedal while watching live data for PDS1 and LPDS voltages/percentages. Expect smooth, proportional change. Record values at rest, mid-travel and full travel.
  5. If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
  6. Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
  7. If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
  8. After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
  9. If faults persist after sensor and harness repair, verify PCM power/grounds and consider PCM diagnosis or replacement only after ruling out all wiring/sensor causes.

Likely causes

  • Faulty accelerator pedal position sensor (PDS1 or LPDS)
  • Wiring harness damage at the pedal (pinched, chafed, broken)
  • Connector corrosion or poor pin contact at pedal or ECM/PCM
  • Lost 5V reference or ground to pedal sensors
  • Aftermarket modifications or incorrect pedal assembly replacement

Fault status

⚠️ Status
P1252 — Pedal correlation: PDS1 and LPDS signal correlation high (accelerator pedal position sensors disagreement).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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Code

P1252

KIA P — Powertrain

Pressure Regulator Control Solenoid Valve No. 2 Circuit Malfunction

Brand: KIA
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or contaminated accelerator pedal position sensor(s)
  • Corroded, loose or damaged wiring / connector to pedal sensors
  • Short to 5V reference or ground on one sensor circuit
  • Poor ground or 5V reference from PCM
  • Intermittent connector contact or water intrusion at pedal harness
  • Failed PCM (less common)

Symptoms

  • MIL/Check Engine light ON
  • Reduced engine power / limp mode
  • Poor or inconsistent throttle response
  • Unexpected engine hesitation or inability to accelerate
  • Possible stored or pending related throttle/pedal codes

What to check

  • Read freeze frame and full scan data; note throttle and pedal sensor voltages/percentages
  • Visually inspect pedal assembly, sensor connectors and wiring for damage or water
  • Check battery voltage and PCM power/ground integrity
  • Backprobe pedal sensor pins and observe voltage while moving pedal
  • Wiggle test harness and connectors while monitoring live data for intermittent faults
  • Check for recent repairs or aftermarket parts that may affect pedal wiring

Signal parameters

  • Typical pedal sensor outputs operate from a 5 V reference; expected operating range ~0.5–4.5 V (manufacturer-specific)
  • Both sensor signals should change smoothly and proportionally as the pedal moves
  • PCM expects a specific correlation between PDS1 and LPDS; a large difference or one stuck at a fixed voltage will set the code
  • Look for shorts to 5 V (stuck high) or to ground (stuck low) and for noisy or intermittent waveforms

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
  2. Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
  3. With key ON (engine off), backprobe each pedal sensor signal, reference, and ground. Verify 5 V reference present and good ground continuity to chassis/PCM.
  4. Slowly operate the accelerator pedal while watching live data for PDS1 and LPDS voltages/percentages. Expect smooth, proportional change. Record values at rest, mid-travel and full travel.
  5. If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
  6. Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
  7. If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
  8. After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
  9. If faults persist after sensor and harness repair, verify PCM power/grounds and consider PCM diagnosis or replacement only after ruling out all wiring/sensor causes.

Likely causes

  • Faulty accelerator pedal position sensor (PDS1 or LPDS)
  • Wiring harness damage at the pedal (pinched, chafed, broken)
  • Connector corrosion or poor pin contact at pedal or ECM/PCM
  • Lost 5V reference or ground to pedal sensors
  • Aftermarket modifications or incorrect pedal assembly replacement

Fault status

⚠️ Status
P1252 — Pedal correlation: PDS1 and LPDS signal correlation high (accelerator pedal position sensors disagreement).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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Code

P1252

LAND ROVER P — Powertrain

Vacuum switching valve stuck in vacuum to atmosphere / vacuum for vacuum

AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or contaminated accelerator pedal position sensor(s)
  • Corroded, loose or damaged wiring / connector to pedal sensors
  • Short to 5V reference or ground on one sensor circuit
  • Poor ground or 5V reference from PCM
  • Intermittent connector contact or water intrusion at pedal harness
  • Failed PCM (less common)

Symptoms

  • MIL/Check Engine light ON
  • Reduced engine power / limp mode
  • Poor or inconsistent throttle response
  • Unexpected engine hesitation or inability to accelerate
  • Possible stored or pending related throttle/pedal codes

What to check

  • Read freeze frame and full scan data; note throttle and pedal sensor voltages/percentages
  • Visually inspect pedal assembly, sensor connectors and wiring for damage or water
  • Check battery voltage and PCM power/ground integrity
  • Backprobe pedal sensor pins and observe voltage while moving pedal
  • Wiggle test harness and connectors while monitoring live data for intermittent faults
  • Check for recent repairs or aftermarket parts that may affect pedal wiring

Signal parameters

  • Typical pedal sensor outputs operate from a 5 V reference; expected operating range ~0.5–4.5 V (manufacturer-specific)
  • Both sensor signals should change smoothly and proportionally as the pedal moves
  • PCM expects a specific correlation between PDS1 and LPDS; a large difference or one stuck at a fixed voltage will set the code
  • Look for shorts to 5 V (stuck high) or to ground (stuck low) and for noisy or intermittent waveforms

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
  2. Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
  3. With key ON (engine off), backprobe each pedal sensor signal, reference, and ground. Verify 5 V reference present and good ground continuity to chassis/PCM.
  4. Slowly operate the accelerator pedal while watching live data for PDS1 and LPDS voltages/percentages. Expect smooth, proportional change. Record values at rest, mid-travel and full travel.
  5. If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
  6. Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
  7. If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
  8. After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
  9. If faults persist after sensor and harness repair, verify PCM power/grounds and consider PCM diagnosis or replacement only after ruling out all wiring/sensor causes.

Likely causes

  • Faulty accelerator pedal position sensor (PDS1 or LPDS)
  • Wiring harness damage at the pedal (pinched, chafed, broken)
  • Connector corrosion or poor pin contact at pedal or ECM/PCM
  • Lost 5V reference or ground to pedal sensors
  • Aftermarket modifications or incorrect pedal assembly replacement

Fault status

⚠️ Status
P1252 — Pedal correlation: PDS1 and LPDS signal correlation high (accelerator pedal position sensors disagreement).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

320

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Code

P1252

LINCOLN P — Powertrain

Pedal Correlation PDS1 and LPDS High

Brand: LINCOLN
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or contaminated accelerator pedal position sensor(s)
  • Corroded, loose or damaged wiring / connector to pedal sensors
  • Short to 5V reference or ground on one sensor circuit
  • Poor ground or 5V reference from PCM
  • Intermittent connector contact or water intrusion at pedal harness
  • Failed PCM (less common)

Symptoms

  • MIL/Check Engine light ON
  • Reduced engine power / limp mode
  • Poor or inconsistent throttle response
  • Unexpected engine hesitation or inability to accelerate
  • Possible stored or pending related throttle/pedal codes

What to check

  • Read freeze frame and full scan data; note throttle and pedal sensor voltages/percentages
  • Visually inspect pedal assembly, sensor connectors and wiring for damage or water
  • Check battery voltage and PCM power/ground integrity
  • Backprobe pedal sensor pins and observe voltage while moving pedal
  • Wiggle test harness and connectors while monitoring live data for intermittent faults
  • Check for recent repairs or aftermarket parts that may affect pedal wiring

Signal parameters

  • Typical pedal sensor outputs operate from a 5 V reference; expected operating range ~0.5–4.5 V (manufacturer-specific)
  • Both sensor signals should change smoothly and proportionally as the pedal moves
  • PCM expects a specific correlation between PDS1 and LPDS; a large difference or one stuck at a fixed voltage will set the code
  • Look for shorts to 5 V (stuck high) or to ground (stuck low) and for noisy or intermittent waveforms

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
  2. Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
  3. With key ON (engine off), backprobe each pedal sensor signal, reference, and ground. Verify 5 V reference present and good ground continuity to chassis/PCM.
  4. Slowly operate the accelerator pedal while watching live data for PDS1 and LPDS voltages/percentages. Expect smooth, proportional change. Record values at rest, mid-travel and full travel.
  5. If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
  6. Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
  7. If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
  8. After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
  9. If faults persist after sensor and harness repair, verify PCM power/grounds and consider PCM diagnosis or replacement only after ruling out all wiring/sensor causes.

Likely causes

  • Faulty accelerator pedal position sensor (PDS1 or LPDS)
  • Wiring harness damage at the pedal (pinched, chafed, broken)
  • Connector corrosion or poor pin contact at pedal or ECM/PCM
  • Lost 5V reference or ground to pedal sensors
  • Aftermarket modifications or incorrect pedal assembly replacement

Fault status

⚠️ Status
P1252 — Pedal correlation: PDS1 and LPDS signal correlation high (accelerator pedal position sensors disagreement).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

166

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

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Code

P1252

MAZDA P — Powertrain

Pressure Regulator Control Solenoid 2 Circuit Malfunction

Brand: MAZDA
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or contaminated accelerator pedal position sensor(s)
  • Corroded, loose or damaged wiring / connector to pedal sensors
  • Short to 5V reference or ground on one sensor circuit
  • Poor ground or 5V reference from PCM
  • Intermittent connector contact or water intrusion at pedal harness
  • Failed PCM (less common)

Symptoms

  • MIL/Check Engine light ON
  • Reduced engine power / limp mode
  • Poor or inconsistent throttle response
  • Unexpected engine hesitation or inability to accelerate
  • Possible stored or pending related throttle/pedal codes

What to check

  • Read freeze frame and full scan data; note throttle and pedal sensor voltages/percentages
  • Visually inspect pedal assembly, sensor connectors and wiring for damage or water
  • Check battery voltage and PCM power/ground integrity
  • Backprobe pedal sensor pins and observe voltage while moving pedal
  • Wiggle test harness and connectors while monitoring live data for intermittent faults
  • Check for recent repairs or aftermarket parts that may affect pedal wiring

Signal parameters

  • Typical pedal sensor outputs operate from a 5 V reference; expected operating range ~0.5–4.5 V (manufacturer-specific)
  • Both sensor signals should change smoothly and proportionally as the pedal moves
  • PCM expects a specific correlation between PDS1 and LPDS; a large difference or one stuck at a fixed voltage will set the code
  • Look for shorts to 5 V (stuck high) or to ground (stuck low) and for noisy or intermittent waveforms

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
  2. Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
  3. With key ON (engine off), backprobe each pedal sensor signal, reference, and ground. Verify 5 V reference present and good ground continuity to chassis/PCM.
  4. Slowly operate the accelerator pedal while watching live data for PDS1 and LPDS voltages/percentages. Expect smooth, proportional change. Record values at rest, mid-travel and full travel.
  5. If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
  6. Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
  7. If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
  8. After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
  9. If faults persist after sensor and harness repair, verify PCM power/grounds and consider PCM diagnosis or replacement only after ruling out all wiring/sensor causes.

Likely causes

  • Faulty accelerator pedal position sensor (PDS1 or LPDS)
  • Wiring harness damage at the pedal (pinched, chafed, broken)
  • Connector corrosion or poor pin contact at pedal or ECM/PCM
  • Lost 5V reference or ground to pedal sensors
  • Aftermarket modifications or incorrect pedal assembly replacement

Fault status

⚠️ Status
P1252 — Pedal correlation: PDS1 and LPDS signal correlation high (accelerator pedal position sensors disagreement).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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Code

P1252

MERCURY P — Powertrain

Pedal Correlation PDS1 and LPDS High

Brand: MERCURY
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or contaminated accelerator pedal position sensor(s)
  • Corroded, loose or damaged wiring / connector to pedal sensors
  • Short to 5V reference or ground on one sensor circuit
  • Poor ground or 5V reference from PCM
  • Intermittent connector contact or water intrusion at pedal harness
  • Failed PCM (less common)

Symptoms

  • MIL/Check Engine light ON
  • Reduced engine power / limp mode
  • Poor or inconsistent throttle response
  • Unexpected engine hesitation or inability to accelerate
  • Possible stored or pending related throttle/pedal codes

What to check

  • Read freeze frame and full scan data; note throttle and pedal sensor voltages/percentages
  • Visually inspect pedal assembly, sensor connectors and wiring for damage or water
  • Check battery voltage and PCM power/ground integrity
  • Backprobe pedal sensor pins and observe voltage while moving pedal
  • Wiggle test harness and connectors while monitoring live data for intermittent faults
  • Check for recent repairs or aftermarket parts that may affect pedal wiring

Signal parameters

  • Typical pedal sensor outputs operate from a 5 V reference; expected operating range ~0.5–4.5 V (manufacturer-specific)
  • Both sensor signals should change smoothly and proportionally as the pedal moves
  • PCM expects a specific correlation between PDS1 and LPDS; a large difference or one stuck at a fixed voltage will set the code
  • Look for shorts to 5 V (stuck high) or to ground (stuck low) and for noisy or intermittent waveforms

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
  2. Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
  3. With key ON (engine off), backprobe each pedal sensor signal, reference, and ground. Verify 5 V reference present and good ground continuity to chassis/PCM.
  4. Slowly operate the accelerator pedal while watching live data for PDS1 and LPDS voltages/percentages. Expect smooth, proportional change. Record values at rest, mid-travel and full travel.
  5. If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
  6. Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
  7. If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
  8. After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
  9. If faults persist after sensor and harness repair, verify PCM power/grounds and consider PCM diagnosis or replacement only after ruling out all wiring/sensor causes.

Likely causes

  • Faulty accelerator pedal position sensor (PDS1 or LPDS)
  • Wiring harness damage at the pedal (pinched, chafed, broken)
  • Connector corrosion or poor pin contact at pedal or ECM/PCM
  • Lost 5V reference or ground to pedal sensors
  • Aftermarket modifications or incorrect pedal assembly replacement

Fault status

⚠️ Status
P1252 — Pedal correlation: PDS1 and LPDS signal correlation high (accelerator pedal position sensors disagreement).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

296

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

MERCURY

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Code

P1252

Other P — Powertrain

Pedal Correlation PDS1 and LPDS High

Brand: Other
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or contaminated accelerator pedal position sensor(s)
  • Corroded, loose or damaged wiring / connector to pedal sensors
  • Short to 5V reference or ground on one sensor circuit
  • Poor ground or 5V reference from PCM
  • Intermittent connector contact or water intrusion at pedal harness
  • Failed PCM (less common)

Symptoms

  • MIL/Check Engine light ON
  • Reduced engine power / limp mode
  • Poor or inconsistent throttle response
  • Unexpected engine hesitation or inability to accelerate
  • Possible stored or pending related throttle/pedal codes

What to check

  • Read freeze frame and full scan data; note throttle and pedal sensor voltages/percentages
  • Visually inspect pedal assembly, sensor connectors and wiring for damage or water
  • Check battery voltage and PCM power/ground integrity
  • Backprobe pedal sensor pins and observe voltage while moving pedal
  • Wiggle test harness and connectors while monitoring live data for intermittent faults
  • Check for recent repairs or aftermarket parts that may affect pedal wiring

Signal parameters

  • Typical pedal sensor outputs operate from a 5 V reference; expected operating range ~0.5–4.5 V (manufacturer-specific)
  • Both sensor signals should change smoothly and proportionally as the pedal moves
  • PCM expects a specific correlation between PDS1 and LPDS; a large difference or one stuck at a fixed voltage will set the code
  • Look for shorts to 5 V (stuck high) or to ground (stuck low) and for noisy or intermittent waveforms

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
  2. Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
  3. With key ON (engine off), backprobe each pedal sensor signal, reference, and ground. Verify 5 V reference present and good ground continuity to chassis/PCM.
  4. Slowly operate the accelerator pedal while watching live data for PDS1 and LPDS voltages/percentages. Expect smooth, proportional change. Record values at rest, mid-travel and full travel.
  5. If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
  6. Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
  7. If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
  8. After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
  9. If faults persist after sensor and harness repair, verify PCM power/grounds and consider PCM diagnosis or replacement only after ruling out all wiring/sensor causes.

Likely causes

  • Faulty accelerator pedal position sensor (PDS1 or LPDS)
  • Wiring harness damage at the pedal (pinched, chafed, broken)
  • Connector corrosion or poor pin contact at pedal or ECM/PCM
  • Lost 5V reference or ground to pedal sensors
  • Aftermarket modifications or incorrect pedal assembly replacement

Fault status

⚠️ Status
P1252 — Pedal correlation: PDS1 and LPDS signal correlation high (accelerator pedal position sensors disagreement).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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9,274

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Code

P1252

RAM P — Powertrain

Vacuum Reservoir Control Circuit High

Brand: RAM
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or contaminated accelerator pedal position sensor(s)
  • Corroded, loose or damaged wiring / connector to pedal sensors
  • Short to 5V reference or ground on one sensor circuit
  • Poor ground or 5V reference from PCM
  • Intermittent connector contact or water intrusion at pedal harness
  • Failed PCM (less common)

Symptoms

  • MIL/Check Engine light ON
  • Reduced engine power / limp mode
  • Poor or inconsistent throttle response
  • Unexpected engine hesitation or inability to accelerate
  • Possible stored or pending related throttle/pedal codes

What to check

  • Read freeze frame and full scan data; note throttle and pedal sensor voltages/percentages
  • Visually inspect pedal assembly, sensor connectors and wiring for damage or water
  • Check battery voltage and PCM power/ground integrity
  • Backprobe pedal sensor pins and observe voltage while moving pedal
  • Wiggle test harness and connectors while monitoring live data for intermittent faults
  • Check for recent repairs or aftermarket parts that may affect pedal wiring

Signal parameters

  • Typical pedal sensor outputs operate from a 5 V reference; expected operating range ~0.5–4.5 V (manufacturer-specific)
  • Both sensor signals should change smoothly and proportionally as the pedal moves
  • PCM expects a specific correlation between PDS1 and LPDS; a large difference or one stuck at a fixed voltage will set the code
  • Look for shorts to 5 V (stuck high) or to ground (stuck low) and for noisy or intermittent waveforms

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
  2. Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
  3. With key ON (engine off), backprobe each pedal sensor signal, reference, and ground. Verify 5 V reference present and good ground continuity to chassis/PCM.
  4. Slowly operate the accelerator pedal while watching live data for PDS1 and LPDS voltages/percentages. Expect smooth, proportional change. Record values at rest, mid-travel and full travel.
  5. If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
  6. Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
  7. If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
  8. After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
  9. If faults persist after sensor and harness repair, verify PCM power/grounds and consider PCM diagnosis or replacement only after ruling out all wiring/sensor causes.

Likely causes

  • Faulty accelerator pedal position sensor (PDS1 or LPDS)
  • Wiring harness damage at the pedal (pinched, chafed, broken)
  • Connector corrosion or poor pin contact at pedal or ECM/PCM
  • Lost 5V reference or ground to pedal sensors
  • Aftermarket modifications or incorrect pedal assembly replacement

Fault status

⚠️ Status
P1252 — Pedal correlation: PDS1 and LPDS signal correlation high (accelerator pedal position sensors disagreement).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

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Code

P1252

SAAB P — Powertrain

Check Engine Lamp, Output From Control Module High

Brand: SAAB
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or contaminated accelerator pedal position sensor(s)
  • Corroded, loose or damaged wiring / connector to pedal sensors
  • Short to 5V reference or ground on one sensor circuit
  • Poor ground or 5V reference from PCM
  • Intermittent connector contact or water intrusion at pedal harness
  • Failed PCM (less common)

Symptoms

  • MIL/Check Engine light ON
  • Reduced engine power / limp mode
  • Poor or inconsistent throttle response
  • Unexpected engine hesitation or inability to accelerate
  • Possible stored or pending related throttle/pedal codes

What to check

  • Read freeze frame and full scan data; note throttle and pedal sensor voltages/percentages
  • Visually inspect pedal assembly, sensor connectors and wiring for damage or water
  • Check battery voltage and PCM power/ground integrity
  • Backprobe pedal sensor pins and observe voltage while moving pedal
  • Wiggle test harness and connectors while monitoring live data for intermittent faults
  • Check for recent repairs or aftermarket parts that may affect pedal wiring

Signal parameters

  • Typical pedal sensor outputs operate from a 5 V reference; expected operating range ~0.5–4.5 V (manufacturer-specific)
  • Both sensor signals should change smoothly and proportionally as the pedal moves
  • PCM expects a specific correlation between PDS1 and LPDS; a large difference or one stuck at a fixed voltage will set the code
  • Look for shorts to 5 V (stuck high) or to ground (stuck low) and for noisy or intermittent waveforms

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
  2. Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
  3. With key ON (engine off), backprobe each pedal sensor signal, reference, and ground. Verify 5 V reference present and good ground continuity to chassis/PCM.
  4. Slowly operate the accelerator pedal while watching live data for PDS1 and LPDS voltages/percentages. Expect smooth, proportional change. Record values at rest, mid-travel and full travel.
  5. If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
  6. Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
  7. If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
  8. After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
  9. If faults persist after sensor and harness repair, verify PCM power/grounds and consider PCM diagnosis or replacement only after ruling out all wiring/sensor causes.

Likely causes

  • Faulty accelerator pedal position sensor (PDS1 or LPDS)
  • Wiring harness damage at the pedal (pinched, chafed, broken)
  • Connector corrosion or poor pin contact at pedal or ECM/PCM
  • Lost 5V reference or ground to pedal sensors
  • Aftermarket modifications or incorrect pedal assembly replacement

Fault status

⚠️ Status
P1252 — Pedal correlation: PDS1 and LPDS signal correlation high (accelerator pedal position sensors disagreement).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

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Code

P1252

VOLKSWAGEN P — Powertrain

Start Of Injection Solenoid Circuit Open/Short To Ground

AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or contaminated accelerator pedal position sensor(s)
  • Corroded, loose or damaged wiring / connector to pedal sensors
  • Short to 5V reference or ground on one sensor circuit
  • Poor ground or 5V reference from PCM
  • Intermittent connector contact or water intrusion at pedal harness
  • Failed PCM (less common)

Symptoms

  • MIL/Check Engine light ON
  • Reduced engine power / limp mode
  • Poor or inconsistent throttle response
  • Unexpected engine hesitation or inability to accelerate
  • Possible stored or pending related throttle/pedal codes

What to check

  • Read freeze frame and full scan data; note throttle and pedal sensor voltages/percentages
  • Visually inspect pedal assembly, sensor connectors and wiring for damage or water
  • Check battery voltage and PCM power/ground integrity
  • Backprobe pedal sensor pins and observe voltage while moving pedal
  • Wiggle test harness and connectors while monitoring live data for intermittent faults
  • Check for recent repairs or aftermarket parts that may affect pedal wiring

Signal parameters

  • Typical pedal sensor outputs operate from a 5 V reference; expected operating range ~0.5–4.5 V (manufacturer-specific)
  • Both sensor signals should change smoothly and proportionally as the pedal moves
  • PCM expects a specific correlation between PDS1 and LPDS; a large difference or one stuck at a fixed voltage will set the code
  • Look for shorts to 5 V (stuck high) or to ground (stuck low) and for noisy or intermittent waveforms

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
  2. Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
  3. With key ON (engine off), backprobe each pedal sensor signal, reference, and ground. Verify 5 V reference present and good ground continuity to chassis/PCM.
  4. Slowly operate the accelerator pedal while watching live data for PDS1 and LPDS voltages/percentages. Expect smooth, proportional change. Record values at rest, mid-travel and full travel.
  5. If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
  6. Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
  7. If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
  8. After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
  9. If faults persist after sensor and harness repair, verify PCM power/grounds and consider PCM diagnosis or replacement only after ruling out all wiring/sensor causes.

Likely causes

  • Faulty accelerator pedal position sensor (PDS1 or LPDS)
  • Wiring harness damage at the pedal (pinched, chafed, broken)
  • Connector corrosion or poor pin contact at pedal or ECM/PCM
  • Lost 5V reference or ground to pedal sensors
  • Aftermarket modifications or incorrect pedal assembly replacement

Fault status

⚠️ Status
P1252 — Pedal correlation: PDS1 and LPDS signal correlation high (accelerator pedal position sensors disagreement).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

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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+100 karma for a short comment :)
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