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Home / DTC / P1624 — Pedal Position Sensor Potentiometer Supply Channel 1 Electrical

P1624 — Pedal Position Sensor Potentiometer Supply Channel 1 Electrical

Detailed page for trouble code P1624.

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P1624

BMW P — Powertrain

Pedal Position Sensor Potentiometer Supply Channel 1 Electrical

Brand: BMW
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high-resistance in the 5 V reference/supply wire to PPS channel 1
  • Damaged or corroded PPS connector or pins
  • Short to battery voltage or ground in the signal or supply wiring
  • Failed pedal position sensor (potentiometer) internal to the accelerator pedal module
  • Faulty engine/drive control module (ECU) supply/reference driver
  • Poor ground(s) related to the pedal sensor circuit

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • Reduced engine power / limp-home mode
  • Unstable or unresponsive accelerator pedal feel
  • Engine hesitation, surging or unexpected throttle behavior
  • Driveability complaints immediately after wiring movement or moisture exposure

What to check

  • Read and record freeze-frame and live data with a scan tool; observe PPS channel 1 value and compare to channel 2 (if present).
  • Visually inspect accelerator pedal connector and harness for corrosion, pins pushed out, water or damage.
  • Check reference supply voltage at the pedal connector with ignition ON (do not crank) — compare to factory spec (typically ~5 V).
  • Measure pedal signal voltage while slowly operating pedal — look for smooth change without dropouts or jumps.
  • Perform continuity and resistance checks from ECU reference pin to pedal connector, and signal return/ground continuity to chassis ground.
  • Wiggle test harness while observing live data and voltages to find intermittent faults.

Signal parameters

  • Reference/supply voltage: typically ~5.0 V (manufacturer tolerance ±0.25 V) at pedal connector with ignition ON
  • Sensor output (channel 1): variable DC voltage; common range ~0.5 V (rest) to ~4.5 V (full pedal travel)
  • Signal behavior: smooth, monotonic change with pedal travel; no sudden drops, jumps or open-circuit (>10 V or floating)
  • Expected wiring continuity: low resistance between ECU reference and pedal reference pin (usually < 1 Ω if short harness)
  • Ground continuity: solid connection from pedal ground to vehicle chassis/ECU ground

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data with an appropriate BMW-compatible scan tool. Note related throttle/pedal codes.
  2. Inspect pedal connector and harness for damage, corrosion or moisture; repair or replace connector/terminal if damaged.
  3. With ignition ON (engine off), back-probe the pedal connector: verify reference (≈5 V) and ground presence. Do NOT short terminals.
  4. Back-probe the channel 1 signal and slowly operate the pedal while monitoring voltage on a DVOM or scope; look for smooth, continuous change.
  5. If reference is missing or out of range, trace and test continuity between ECU reference pin and pedal reference pin; repair open/shorts found.
  6. If signal is erratic only at pedal, disconnect pedal and check resistance/continuity of the sensor/ potentiometer per BMW specs; replace pedal module if out of tolerance.
  7. If wiring and pedal check OK, test ECU supply/reference driver for faults (consult wiring diagrams and manufacturer procedures) — do not replace ECU without thorough testing.
  8. After repairs, clear codes and perform a road test while monitoring live PPS channels and driveability. Confirm code does not return.
  9. Safety note: Follow manufacturer procedures for live testing and take care when probing live circuits; avoid shorting pins together.

Likely causes

  • Broken or corroded connector at accelerator pedal module
  • Open or shorted supply/reference wire between ECU and pedal sensor
  • Internal failure of the pedal potentiometer (channel 1)
  • Loose or corroded ground related to pedal/ECU
  • Aftermarket wiring damage or previous improper repair

Fault status

⚠️ Status
P1624 — Pedal Position Sensor (potentiometer) supply channel 1 electrical fault detected. Indicates open/short/intermittent condition in supply or wiring to channel 1 of the pedal potentiometer; may cause CEL and reduced engine power.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0120 P0122 P0123 P2135 P1604
Repair manuals

Manual library for BMW

479

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Code

P1624

BUICK P — Powertrain

Customer Snapshot Data Available

Brand: BUICK
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high-resistance in the 5 V reference/supply wire to PPS channel 1
  • Damaged or corroded PPS connector or pins
  • Short to battery voltage or ground in the signal or supply wiring
  • Failed pedal position sensor (potentiometer) internal to the accelerator pedal module
  • Faulty engine/drive control module (ECU) supply/reference driver
  • Poor ground(s) related to the pedal sensor circuit

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • Reduced engine power / limp-home mode
  • Unstable or unresponsive accelerator pedal feel
  • Engine hesitation, surging or unexpected throttle behavior
  • Driveability complaints immediately after wiring movement or moisture exposure

What to check

  • Read and record freeze-frame and live data with a scan tool; observe PPS channel 1 value and compare to channel 2 (if present).
  • Visually inspect accelerator pedal connector and harness for corrosion, pins pushed out, water or damage.
  • Check reference supply voltage at the pedal connector with ignition ON (do not crank) — compare to factory spec (typically ~5 V).
  • Measure pedal signal voltage while slowly operating pedal — look for smooth change without dropouts or jumps.
  • Perform continuity and resistance checks from ECU reference pin to pedal connector, and signal return/ground continuity to chassis ground.
  • Wiggle test harness while observing live data and voltages to find intermittent faults.

Signal parameters

  • Reference/supply voltage: typically ~5.0 V (manufacturer tolerance ±0.25 V) at pedal connector with ignition ON
  • Sensor output (channel 1): variable DC voltage; common range ~0.5 V (rest) to ~4.5 V (full pedal travel)
  • Signal behavior: smooth, monotonic change with pedal travel; no sudden drops, jumps or open-circuit (>10 V or floating)
  • Expected wiring continuity: low resistance between ECU reference and pedal reference pin (usually < 1 Ω if short harness)
  • Ground continuity: solid connection from pedal ground to vehicle chassis/ECU ground

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data with an appropriate BMW-compatible scan tool. Note related throttle/pedal codes.
  2. Inspect pedal connector and harness for damage, corrosion or moisture; repair or replace connector/terminal if damaged.
  3. With ignition ON (engine off), back-probe the pedal connector: verify reference (≈5 V) and ground presence. Do NOT short terminals.
  4. Back-probe the channel 1 signal and slowly operate the pedal while monitoring voltage on a DVOM or scope; look for smooth, continuous change.
  5. If reference is missing or out of range, trace and test continuity between ECU reference pin and pedal reference pin; repair open/shorts found.
  6. If signal is erratic only at pedal, disconnect pedal and check resistance/continuity of the sensor/ potentiometer per BMW specs; replace pedal module if out of tolerance.
  7. If wiring and pedal check OK, test ECU supply/reference driver for faults (consult wiring diagrams and manufacturer procedures) — do not replace ECU without thorough testing.
  8. After repairs, clear codes and perform a road test while monitoring live PPS channels and driveability. Confirm code does not return.
  9. Safety note: Follow manufacturer procedures for live testing and take care when probing live circuits; avoid shorting pins together.

Likely causes

  • Broken or corroded connector at accelerator pedal module
  • Open or shorted supply/reference wire between ECU and pedal sensor
  • Internal failure of the pedal potentiometer (channel 1)
  • Loose or corroded ground related to pedal/ECU
  • Aftermarket wiring damage or previous improper repair

Fault status

⚠️ Status
P1624 — Pedal Position Sensor (potentiometer) supply channel 1 electrical fault detected. Indicates open/short/intermittent condition in supply or wiring to channel 1 of the pedal potentiometer; may cause CEL and reduced engine power.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0120 P0122 P0123 P2135 P1604
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Code

P1624

CADILLAC P — Powertrain

Customer Snapshot Data Available

Brand: CADILLAC
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high-resistance in the 5 V reference/supply wire to PPS channel 1
  • Damaged or corroded PPS connector or pins
  • Short to battery voltage or ground in the signal or supply wiring
  • Failed pedal position sensor (potentiometer) internal to the accelerator pedal module
  • Faulty engine/drive control module (ECU) supply/reference driver
  • Poor ground(s) related to the pedal sensor circuit

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • Reduced engine power / limp-home mode
  • Unstable or unresponsive accelerator pedal feel
  • Engine hesitation, surging or unexpected throttle behavior
  • Driveability complaints immediately after wiring movement or moisture exposure

What to check

  • Read and record freeze-frame and live data with a scan tool; observe PPS channel 1 value and compare to channel 2 (if present).
  • Visually inspect accelerator pedal connector and harness for corrosion, pins pushed out, water or damage.
  • Check reference supply voltage at the pedal connector with ignition ON (do not crank) — compare to factory spec (typically ~5 V).
  • Measure pedal signal voltage while slowly operating pedal — look for smooth change without dropouts or jumps.
  • Perform continuity and resistance checks from ECU reference pin to pedal connector, and signal return/ground continuity to chassis ground.
  • Wiggle test harness while observing live data and voltages to find intermittent faults.

Signal parameters

  • Reference/supply voltage: typically ~5.0 V (manufacturer tolerance ±0.25 V) at pedal connector with ignition ON
  • Sensor output (channel 1): variable DC voltage; common range ~0.5 V (rest) to ~4.5 V (full pedal travel)
  • Signal behavior: smooth, monotonic change with pedal travel; no sudden drops, jumps or open-circuit (>10 V or floating)
  • Expected wiring continuity: low resistance between ECU reference and pedal reference pin (usually < 1 Ω if short harness)
  • Ground continuity: solid connection from pedal ground to vehicle chassis/ECU ground

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data with an appropriate BMW-compatible scan tool. Note related throttle/pedal codes.
  2. Inspect pedal connector and harness for damage, corrosion or moisture; repair or replace connector/terminal if damaged.
  3. With ignition ON (engine off), back-probe the pedal connector: verify reference (≈5 V) and ground presence. Do NOT short terminals.
  4. Back-probe the channel 1 signal and slowly operate the pedal while monitoring voltage on a DVOM or scope; look for smooth, continuous change.
  5. If reference is missing or out of range, trace and test continuity between ECU reference pin and pedal reference pin; repair open/shorts found.
  6. If signal is erratic only at pedal, disconnect pedal and check resistance/continuity of the sensor/ potentiometer per BMW specs; replace pedal module if out of tolerance.
  7. If wiring and pedal check OK, test ECU supply/reference driver for faults (consult wiring diagrams and manufacturer procedures) — do not replace ECU without thorough testing.
  8. After repairs, clear codes and perform a road test while monitoring live PPS channels and driveability. Confirm code does not return.
  9. Safety note: Follow manufacturer procedures for live testing and take care when probing live circuits; avoid shorting pins together.

Likely causes

  • Broken or corroded connector at accelerator pedal module
  • Open or shorted supply/reference wire between ECU and pedal sensor
  • Internal failure of the pedal potentiometer (channel 1)
  • Loose or corroded ground related to pedal/ECU
  • Aftermarket wiring damage or previous improper repair

Fault status

⚠️ Status
P1624 — Pedal Position Sensor (potentiometer) supply channel 1 electrical fault detected. Indicates open/short/intermittent condition in supply or wiring to channel 1 of the pedal potentiometer; may cause CEL and reduced engine power.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0120 P0122 P0123 P2135 P1604
191

Browse 191 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

P1624

CHEVROLET P — Powertrain

Customer Snapshot Data Available

Brand: CHEVROLET
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high-resistance in the 5 V reference/supply wire to PPS channel 1
  • Damaged or corroded PPS connector or pins
  • Short to battery voltage or ground in the signal or supply wiring
  • Failed pedal position sensor (potentiometer) internal to the accelerator pedal module
  • Faulty engine/drive control module (ECU) supply/reference driver
  • Poor ground(s) related to the pedal sensor circuit

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • Reduced engine power / limp-home mode
  • Unstable or unresponsive accelerator pedal feel
  • Engine hesitation, surging or unexpected throttle behavior
  • Driveability complaints immediately after wiring movement or moisture exposure

What to check

  • Read and record freeze-frame and live data with a scan tool; observe PPS channel 1 value and compare to channel 2 (if present).
  • Visually inspect accelerator pedal connector and harness for corrosion, pins pushed out, water or damage.
  • Check reference supply voltage at the pedal connector with ignition ON (do not crank) — compare to factory spec (typically ~5 V).
  • Measure pedal signal voltage while slowly operating pedal — look for smooth change without dropouts or jumps.
  • Perform continuity and resistance checks from ECU reference pin to pedal connector, and signal return/ground continuity to chassis ground.
  • Wiggle test harness while observing live data and voltages to find intermittent faults.

Signal parameters

  • Reference/supply voltage: typically ~5.0 V (manufacturer tolerance ±0.25 V) at pedal connector with ignition ON
  • Sensor output (channel 1): variable DC voltage; common range ~0.5 V (rest) to ~4.5 V (full pedal travel)
  • Signal behavior: smooth, monotonic change with pedal travel; no sudden drops, jumps or open-circuit (>10 V or floating)
  • Expected wiring continuity: low resistance between ECU reference and pedal reference pin (usually < 1 Ω if short harness)
  • Ground continuity: solid connection from pedal ground to vehicle chassis/ECU ground

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data with an appropriate BMW-compatible scan tool. Note related throttle/pedal codes.
  2. Inspect pedal connector and harness for damage, corrosion or moisture; repair or replace connector/terminal if damaged.
  3. With ignition ON (engine off), back-probe the pedal connector: verify reference (≈5 V) and ground presence. Do NOT short terminals.
  4. Back-probe the channel 1 signal and slowly operate the pedal while monitoring voltage on a DVOM or scope; look for smooth, continuous change.
  5. If reference is missing or out of range, trace and test continuity between ECU reference pin and pedal reference pin; repair open/shorts found.
  6. If signal is erratic only at pedal, disconnect pedal and check resistance/continuity of the sensor/ potentiometer per BMW specs; replace pedal module if out of tolerance.
  7. If wiring and pedal check OK, test ECU supply/reference driver for faults (consult wiring diagrams and manufacturer procedures) — do not replace ECU without thorough testing.
  8. After repairs, clear codes and perform a road test while monitoring live PPS channels and driveability. Confirm code does not return.
  9. Safety note: Follow manufacturer procedures for live testing and take care when probing live circuits; avoid shorting pins together.

Likely causes

  • Broken or corroded connector at accelerator pedal module
  • Open or shorted supply/reference wire between ECU and pedal sensor
  • Internal failure of the pedal potentiometer (channel 1)
  • Loose or corroded ground related to pedal/ECU
  • Aftermarket wiring damage or previous improper repair

Fault status

⚠️ Status
P1624 — Pedal Position Sensor (potentiometer) supply channel 1 electrical fault detected. Indicates open/short/intermittent condition in supply or wiring to channel 1 of the pedal potentiometer; may cause CEL and reduced engine power.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0120 P0122 P0123 P2135 P1604
456

Browse 456 CHEVROLET manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

CHEVROLET

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Keep it short and practical. Up to 500 characters.
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Code

P1624

DAEWOO P — Powertrain

Radiator fan mal

Brand: DAEWOO
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high-resistance in the 5 V reference/supply wire to PPS channel 1
  • Damaged or corroded PPS connector or pins
  • Short to battery voltage or ground in the signal or supply wiring
  • Failed pedal position sensor (potentiometer) internal to the accelerator pedal module
  • Faulty engine/drive control module (ECU) supply/reference driver
  • Poor ground(s) related to the pedal sensor circuit

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • Reduced engine power / limp-home mode
  • Unstable or unresponsive accelerator pedal feel
  • Engine hesitation, surging or unexpected throttle behavior
  • Driveability complaints immediately after wiring movement or moisture exposure

What to check

  • Read and record freeze-frame and live data with a scan tool; observe PPS channel 1 value and compare to channel 2 (if present).
  • Visually inspect accelerator pedal connector and harness for corrosion, pins pushed out, water or damage.
  • Check reference supply voltage at the pedal connector with ignition ON (do not crank) — compare to factory spec (typically ~5 V).
  • Measure pedal signal voltage while slowly operating pedal — look for smooth change without dropouts or jumps.
  • Perform continuity and resistance checks from ECU reference pin to pedal connector, and signal return/ground continuity to chassis ground.
  • Wiggle test harness while observing live data and voltages to find intermittent faults.

Signal parameters

  • Reference/supply voltage: typically ~5.0 V (manufacturer tolerance ±0.25 V) at pedal connector with ignition ON
  • Sensor output (channel 1): variable DC voltage; common range ~0.5 V (rest) to ~4.5 V (full pedal travel)
  • Signal behavior: smooth, monotonic change with pedal travel; no sudden drops, jumps or open-circuit (>10 V or floating)
  • Expected wiring continuity: low resistance between ECU reference and pedal reference pin (usually < 1 Ω if short harness)
  • Ground continuity: solid connection from pedal ground to vehicle chassis/ECU ground

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data with an appropriate BMW-compatible scan tool. Note related throttle/pedal codes.
  2. Inspect pedal connector and harness for damage, corrosion or moisture; repair or replace connector/terminal if damaged.
  3. With ignition ON (engine off), back-probe the pedal connector: verify reference (≈5 V) and ground presence. Do NOT short terminals.
  4. Back-probe the channel 1 signal and slowly operate the pedal while monitoring voltage on a DVOM or scope; look for smooth, continuous change.
  5. If reference is missing or out of range, trace and test continuity between ECU reference pin and pedal reference pin; repair open/shorts found.
  6. If signal is erratic only at pedal, disconnect pedal and check resistance/continuity of the sensor/ potentiometer per BMW specs; replace pedal module if out of tolerance.
  7. If wiring and pedal check OK, test ECU supply/reference driver for faults (consult wiring diagrams and manufacturer procedures) — do not replace ECU without thorough testing.
  8. After repairs, clear codes and perform a road test while monitoring live PPS channels and driveability. Confirm code does not return.
  9. Safety note: Follow manufacturer procedures for live testing and take care when probing live circuits; avoid shorting pins together.

Likely causes

  • Broken or corroded connector at accelerator pedal module
  • Open or shorted supply/reference wire between ECU and pedal sensor
  • Internal failure of the pedal potentiometer (channel 1)
  • Loose or corroded ground related to pedal/ECU
  • Aftermarket wiring damage or previous improper repair

Fault status

⚠️ Status
P1624 — Pedal Position Sensor (potentiometer) supply channel 1 electrical fault detected. Indicates open/short/intermittent condition in supply or wiring to channel 1 of the pedal potentiometer; may cause CEL and reduced engine power.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0120 P0122 P0123 P2135 P1604
Repair manuals

Manual library for DAEWOO

75

Browse 75 DAEWOO manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

DAEWOO

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1624

GM P — Powertrain

Customer Snapshot Data Available

Brand: GM
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high-resistance in the 5 V reference/supply wire to PPS channel 1
  • Damaged or corroded PPS connector or pins
  • Short to battery voltage or ground in the signal or supply wiring
  • Failed pedal position sensor (potentiometer) internal to the accelerator pedal module
  • Faulty engine/drive control module (ECU) supply/reference driver
  • Poor ground(s) related to the pedal sensor circuit

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • Reduced engine power / limp-home mode
  • Unstable or unresponsive accelerator pedal feel
  • Engine hesitation, surging or unexpected throttle behavior
  • Driveability complaints immediately after wiring movement or moisture exposure

What to check

  • Read and record freeze-frame and live data with a scan tool; observe PPS channel 1 value and compare to channel 2 (if present).
  • Visually inspect accelerator pedal connector and harness for corrosion, pins pushed out, water or damage.
  • Check reference supply voltage at the pedal connector with ignition ON (do not crank) — compare to factory spec (typically ~5 V).
  • Measure pedal signal voltage while slowly operating pedal — look for smooth change without dropouts or jumps.
  • Perform continuity and resistance checks from ECU reference pin to pedal connector, and signal return/ground continuity to chassis ground.
  • Wiggle test harness while observing live data and voltages to find intermittent faults.

Signal parameters

  • Reference/supply voltage: typically ~5.0 V (manufacturer tolerance ±0.25 V) at pedal connector with ignition ON
  • Sensor output (channel 1): variable DC voltage; common range ~0.5 V (rest) to ~4.5 V (full pedal travel)
  • Signal behavior: smooth, monotonic change with pedal travel; no sudden drops, jumps or open-circuit (>10 V or floating)
  • Expected wiring continuity: low resistance between ECU reference and pedal reference pin (usually < 1 Ω if short harness)
  • Ground continuity: solid connection from pedal ground to vehicle chassis/ECU ground

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data with an appropriate BMW-compatible scan tool. Note related throttle/pedal codes.
  2. Inspect pedal connector and harness for damage, corrosion or moisture; repair or replace connector/terminal if damaged.
  3. With ignition ON (engine off), back-probe the pedal connector: verify reference (≈5 V) and ground presence. Do NOT short terminals.
  4. Back-probe the channel 1 signal and slowly operate the pedal while monitoring voltage on a DVOM or scope; look for smooth, continuous change.
  5. If reference is missing or out of range, trace and test continuity between ECU reference pin and pedal reference pin; repair open/shorts found.
  6. If signal is erratic only at pedal, disconnect pedal and check resistance/continuity of the sensor/ potentiometer per BMW specs; replace pedal module if out of tolerance.
  7. If wiring and pedal check OK, test ECU supply/reference driver for faults (consult wiring diagrams and manufacturer procedures) — do not replace ECU without thorough testing.
  8. After repairs, clear codes and perform a road test while monitoring live PPS channels and driveability. Confirm code does not return.
  9. Safety note: Follow manufacturer procedures for live testing and take care when probing live circuits; avoid shorting pins together.

Likely causes

  • Broken or corroded connector at accelerator pedal module
  • Open or shorted supply/reference wire between ECU and pedal sensor
  • Internal failure of the pedal potentiometer (channel 1)
  • Loose or corroded ground related to pedal/ECU
  • Aftermarket wiring damage or previous improper repair

Fault status

⚠️ Status
P1624 — Pedal Position Sensor (potentiometer) supply channel 1 electrical fault detected. Indicates open/short/intermittent condition in supply or wiring to channel 1 of the pedal potentiometer; may cause CEL and reduced engine power.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0120 P0122 P0123 P2135 P1604
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1624

GMC P — Powertrain

Customer Snapshot Data Available

Brand: GMC
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high-resistance in the 5 V reference/supply wire to PPS channel 1
  • Damaged or corroded PPS connector or pins
  • Short to battery voltage or ground in the signal or supply wiring
  • Failed pedal position sensor (potentiometer) internal to the accelerator pedal module
  • Faulty engine/drive control module (ECU) supply/reference driver
  • Poor ground(s) related to the pedal sensor circuit

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • Reduced engine power / limp-home mode
  • Unstable or unresponsive accelerator pedal feel
  • Engine hesitation, surging or unexpected throttle behavior
  • Driveability complaints immediately after wiring movement or moisture exposure

What to check

  • Read and record freeze-frame and live data with a scan tool; observe PPS channel 1 value and compare to channel 2 (if present).
  • Visually inspect accelerator pedal connector and harness for corrosion, pins pushed out, water or damage.
  • Check reference supply voltage at the pedal connector with ignition ON (do not crank) — compare to factory spec (typically ~5 V).
  • Measure pedal signal voltage while slowly operating pedal — look for smooth change without dropouts or jumps.
  • Perform continuity and resistance checks from ECU reference pin to pedal connector, and signal return/ground continuity to chassis ground.
  • Wiggle test harness while observing live data and voltages to find intermittent faults.

Signal parameters

  • Reference/supply voltage: typically ~5.0 V (manufacturer tolerance ±0.25 V) at pedal connector with ignition ON
  • Sensor output (channel 1): variable DC voltage; common range ~0.5 V (rest) to ~4.5 V (full pedal travel)
  • Signal behavior: smooth, monotonic change with pedal travel; no sudden drops, jumps or open-circuit (>10 V or floating)
  • Expected wiring continuity: low resistance between ECU reference and pedal reference pin (usually < 1 Ω if short harness)
  • Ground continuity: solid connection from pedal ground to vehicle chassis/ECU ground

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data with an appropriate BMW-compatible scan tool. Note related throttle/pedal codes.
  2. Inspect pedal connector and harness for damage, corrosion or moisture; repair or replace connector/terminal if damaged.
  3. With ignition ON (engine off), back-probe the pedal connector: verify reference (≈5 V) and ground presence. Do NOT short terminals.
  4. Back-probe the channel 1 signal and slowly operate the pedal while monitoring voltage on a DVOM or scope; look for smooth, continuous change.
  5. If reference is missing or out of range, trace and test continuity between ECU reference pin and pedal reference pin; repair open/shorts found.
  6. If signal is erratic only at pedal, disconnect pedal and check resistance/continuity of the sensor/ potentiometer per BMW specs; replace pedal module if out of tolerance.
  7. If wiring and pedal check OK, test ECU supply/reference driver for faults (consult wiring diagrams and manufacturer procedures) — do not replace ECU without thorough testing.
  8. After repairs, clear codes and perform a road test while monitoring live PPS channels and driveability. Confirm code does not return.
  9. Safety note: Follow manufacturer procedures for live testing and take care when probing live circuits; avoid shorting pins together.

Likely causes

  • Broken or corroded connector at accelerator pedal module
  • Open or shorted supply/reference wire between ECU and pedal sensor
  • Internal failure of the pedal potentiometer (channel 1)
  • Loose or corroded ground related to pedal/ECU
  • Aftermarket wiring damage or previous improper repair

Fault status

⚠️ Status
P1624 — Pedal Position Sensor (potentiometer) supply channel 1 electrical fault detected. Indicates open/short/intermittent condition in supply or wiring to channel 1 of the pedal potentiometer; may cause CEL and reduced engine power.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0120 P0122 P0123 P2135 P1604
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1624

HUMMER P — Powertrain

Customer Snapshot Requested - Data Available

Brand: HUMMER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high-resistance in the 5 V reference/supply wire to PPS channel 1
  • Damaged or corroded PPS connector or pins
  • Short to battery voltage or ground in the signal or supply wiring
  • Failed pedal position sensor (potentiometer) internal to the accelerator pedal module
  • Faulty engine/drive control module (ECU) supply/reference driver
  • Poor ground(s) related to the pedal sensor circuit

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • Reduced engine power / limp-home mode
  • Unstable or unresponsive accelerator pedal feel
  • Engine hesitation, surging or unexpected throttle behavior
  • Driveability complaints immediately after wiring movement or moisture exposure

What to check

  • Read and record freeze-frame and live data with a scan tool; observe PPS channel 1 value and compare to channel 2 (if present).
  • Visually inspect accelerator pedal connector and harness for corrosion, pins pushed out, water or damage.
  • Check reference supply voltage at the pedal connector with ignition ON (do not crank) — compare to factory spec (typically ~5 V).
  • Measure pedal signal voltage while slowly operating pedal — look for smooth change without dropouts or jumps.
  • Perform continuity and resistance checks from ECU reference pin to pedal connector, and signal return/ground continuity to chassis ground.
  • Wiggle test harness while observing live data and voltages to find intermittent faults.

Signal parameters

  • Reference/supply voltage: typically ~5.0 V (manufacturer tolerance ±0.25 V) at pedal connector with ignition ON
  • Sensor output (channel 1): variable DC voltage; common range ~0.5 V (rest) to ~4.5 V (full pedal travel)
  • Signal behavior: smooth, monotonic change with pedal travel; no sudden drops, jumps or open-circuit (>10 V or floating)
  • Expected wiring continuity: low resistance between ECU reference and pedal reference pin (usually < 1 Ω if short harness)
  • Ground continuity: solid connection from pedal ground to vehicle chassis/ECU ground

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data with an appropriate BMW-compatible scan tool. Note related throttle/pedal codes.
  2. Inspect pedal connector and harness for damage, corrosion or moisture; repair or replace connector/terminal if damaged.
  3. With ignition ON (engine off), back-probe the pedal connector: verify reference (≈5 V) and ground presence. Do NOT short terminals.
  4. Back-probe the channel 1 signal and slowly operate the pedal while monitoring voltage on a DVOM or scope; look for smooth, continuous change.
  5. If reference is missing or out of range, trace and test continuity between ECU reference pin and pedal reference pin; repair open/shorts found.
  6. If signal is erratic only at pedal, disconnect pedal and check resistance/continuity of the sensor/ potentiometer per BMW specs; replace pedal module if out of tolerance.
  7. If wiring and pedal check OK, test ECU supply/reference driver for faults (consult wiring diagrams and manufacturer procedures) — do not replace ECU without thorough testing.
  8. After repairs, clear codes and perform a road test while monitoring live PPS channels and driveability. Confirm code does not return.
  9. Safety note: Follow manufacturer procedures for live testing and take care when probing live circuits; avoid shorting pins together.

Likely causes

  • Broken or corroded connector at accelerator pedal module
  • Open or shorted supply/reference wire between ECU and pedal sensor
  • Internal failure of the pedal potentiometer (channel 1)
  • Loose or corroded ground related to pedal/ECU
  • Aftermarket wiring damage or previous improper repair

Fault status

⚠️ Status
P1624 — Pedal Position Sensor (potentiometer) supply channel 1 electrical fault detected. Indicates open/short/intermittent condition in supply or wiring to channel 1 of the pedal potentiometer; may cause CEL and reduced engine power.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0120 P0122 P0123 P2135 P1604
Repair manuals

Manual library for HUMMER

138

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Code

P1624

KIA P — Powertrain

TCM To PCM MIL Request Signal Circuit Fault

Brand: KIA
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high-resistance in the 5 V reference/supply wire to PPS channel 1
  • Damaged or corroded PPS connector or pins
  • Short to battery voltage or ground in the signal or supply wiring
  • Failed pedal position sensor (potentiometer) internal to the accelerator pedal module
  • Faulty engine/drive control module (ECU) supply/reference driver
  • Poor ground(s) related to the pedal sensor circuit

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • Reduced engine power / limp-home mode
  • Unstable or unresponsive accelerator pedal feel
  • Engine hesitation, surging or unexpected throttle behavior
  • Driveability complaints immediately after wiring movement or moisture exposure

What to check

  • Read and record freeze-frame and live data with a scan tool; observe PPS channel 1 value and compare to channel 2 (if present).
  • Visually inspect accelerator pedal connector and harness for corrosion, pins pushed out, water or damage.
  • Check reference supply voltage at the pedal connector with ignition ON (do not crank) — compare to factory spec (typically ~5 V).
  • Measure pedal signal voltage while slowly operating pedal — look for smooth change without dropouts or jumps.
  • Perform continuity and resistance checks from ECU reference pin to pedal connector, and signal return/ground continuity to chassis ground.
  • Wiggle test harness while observing live data and voltages to find intermittent faults.

Signal parameters

  • Reference/supply voltage: typically ~5.0 V (manufacturer tolerance ±0.25 V) at pedal connector with ignition ON
  • Sensor output (channel 1): variable DC voltage; common range ~0.5 V (rest) to ~4.5 V (full pedal travel)
  • Signal behavior: smooth, monotonic change with pedal travel; no sudden drops, jumps or open-circuit (>10 V or floating)
  • Expected wiring continuity: low resistance between ECU reference and pedal reference pin (usually < 1 Ω if short harness)
  • Ground continuity: solid connection from pedal ground to vehicle chassis/ECU ground

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data with an appropriate BMW-compatible scan tool. Note related throttle/pedal codes.
  2. Inspect pedal connector and harness for damage, corrosion or moisture; repair or replace connector/terminal if damaged.
  3. With ignition ON (engine off), back-probe the pedal connector: verify reference (≈5 V) and ground presence. Do NOT short terminals.
  4. Back-probe the channel 1 signal and slowly operate the pedal while monitoring voltage on a DVOM or scope; look for smooth, continuous change.
  5. If reference is missing or out of range, trace and test continuity between ECU reference pin and pedal reference pin; repair open/shorts found.
  6. If signal is erratic only at pedal, disconnect pedal and check resistance/continuity of the sensor/ potentiometer per BMW specs; replace pedal module if out of tolerance.
  7. If wiring and pedal check OK, test ECU supply/reference driver for faults (consult wiring diagrams and manufacturer procedures) — do not replace ECU without thorough testing.
  8. After repairs, clear codes and perform a road test while monitoring live PPS channels and driveability. Confirm code does not return.
  9. Safety note: Follow manufacturer procedures for live testing and take care when probing live circuits; avoid shorting pins together.

Likely causes

  • Broken or corroded connector at accelerator pedal module
  • Open or shorted supply/reference wire between ECU and pedal sensor
  • Internal failure of the pedal potentiometer (channel 1)
  • Loose or corroded ground related to pedal/ECU
  • Aftermarket wiring damage or previous improper repair

Fault status

⚠️ Status
P1624 — Pedal Position Sensor (potentiometer) supply channel 1 electrical fault detected. Indicates open/short/intermittent condition in supply or wiring to channel 1 of the pedal potentiometer; may cause CEL and reduced engine power.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0120 P0122 P0123 P2135 P1604
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Code

P1624

LAND ROVER P — Powertrain

Anti-theft system

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high-resistance in the 5 V reference/supply wire to PPS channel 1
  • Damaged or corroded PPS connector or pins
  • Short to battery voltage or ground in the signal or supply wiring
  • Failed pedal position sensor (potentiometer) internal to the accelerator pedal module
  • Faulty engine/drive control module (ECU) supply/reference driver
  • Poor ground(s) related to the pedal sensor circuit

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • Reduced engine power / limp-home mode
  • Unstable or unresponsive accelerator pedal feel
  • Engine hesitation, surging or unexpected throttle behavior
  • Driveability complaints immediately after wiring movement or moisture exposure

What to check

  • Read and record freeze-frame and live data with a scan tool; observe PPS channel 1 value and compare to channel 2 (if present).
  • Visually inspect accelerator pedal connector and harness for corrosion, pins pushed out, water or damage.
  • Check reference supply voltage at the pedal connector with ignition ON (do not crank) — compare to factory spec (typically ~5 V).
  • Measure pedal signal voltage while slowly operating pedal — look for smooth change without dropouts or jumps.
  • Perform continuity and resistance checks from ECU reference pin to pedal connector, and signal return/ground continuity to chassis ground.
  • Wiggle test harness while observing live data and voltages to find intermittent faults.

Signal parameters

  • Reference/supply voltage: typically ~5.0 V (manufacturer tolerance ±0.25 V) at pedal connector with ignition ON
  • Sensor output (channel 1): variable DC voltage; common range ~0.5 V (rest) to ~4.5 V (full pedal travel)
  • Signal behavior: smooth, monotonic change with pedal travel; no sudden drops, jumps or open-circuit (>10 V or floating)
  • Expected wiring continuity: low resistance between ECU reference and pedal reference pin (usually < 1 Ω if short harness)
  • Ground continuity: solid connection from pedal ground to vehicle chassis/ECU ground

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data with an appropriate BMW-compatible scan tool. Note related throttle/pedal codes.
  2. Inspect pedal connector and harness for damage, corrosion or moisture; repair or replace connector/terminal if damaged.
  3. With ignition ON (engine off), back-probe the pedal connector: verify reference (≈5 V) and ground presence. Do NOT short terminals.
  4. Back-probe the channel 1 signal and slowly operate the pedal while monitoring voltage on a DVOM or scope; look for smooth, continuous change.
  5. If reference is missing or out of range, trace and test continuity between ECU reference pin and pedal reference pin; repair open/shorts found.
  6. If signal is erratic only at pedal, disconnect pedal and check resistance/continuity of the sensor/ potentiometer per BMW specs; replace pedal module if out of tolerance.
  7. If wiring and pedal check OK, test ECU supply/reference driver for faults (consult wiring diagrams and manufacturer procedures) — do not replace ECU without thorough testing.
  8. After repairs, clear codes and perform a road test while monitoring live PPS channels and driveability. Confirm code does not return.
  9. Safety note: Follow manufacturer procedures for live testing and take care when probing live circuits; avoid shorting pins together.

Likely causes

  • Broken or corroded connector at accelerator pedal module
  • Open or shorted supply/reference wire between ECU and pedal sensor
  • Internal failure of the pedal potentiometer (channel 1)
  • Loose or corroded ground related to pedal/ECU
  • Aftermarket wiring damage or previous improper repair

Fault status

⚠️ Status
P1624 — Pedal Position Sensor (potentiometer) supply channel 1 electrical fault detected. Indicates open/short/intermittent condition in supply or wiring to channel 1 of the pedal potentiometer; may cause CEL and reduced engine power.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0120 P0122 P0123 P2135 P1604
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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Code

P1624

MAZDA P — Powertrain

Immobilizer System Fault

Brand: MAZDA
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high-resistance in the 5 V reference/supply wire to PPS channel 1
  • Damaged or corroded PPS connector or pins
  • Short to battery voltage or ground in the signal or supply wiring
  • Failed pedal position sensor (potentiometer) internal to the accelerator pedal module
  • Faulty engine/drive control module (ECU) supply/reference driver
  • Poor ground(s) related to the pedal sensor circuit

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • Reduced engine power / limp-home mode
  • Unstable or unresponsive accelerator pedal feel
  • Engine hesitation, surging or unexpected throttle behavior
  • Driveability complaints immediately after wiring movement or moisture exposure

What to check

  • Read and record freeze-frame and live data with a scan tool; observe PPS channel 1 value and compare to channel 2 (if present).
  • Visually inspect accelerator pedal connector and harness for corrosion, pins pushed out, water or damage.
  • Check reference supply voltage at the pedal connector with ignition ON (do not crank) — compare to factory spec (typically ~5 V).
  • Measure pedal signal voltage while slowly operating pedal — look for smooth change without dropouts or jumps.
  • Perform continuity and resistance checks from ECU reference pin to pedal connector, and signal return/ground continuity to chassis ground.
  • Wiggle test harness while observing live data and voltages to find intermittent faults.

Signal parameters

  • Reference/supply voltage: typically ~5.0 V (manufacturer tolerance ±0.25 V) at pedal connector with ignition ON
  • Sensor output (channel 1): variable DC voltage; common range ~0.5 V (rest) to ~4.5 V (full pedal travel)
  • Signal behavior: smooth, monotonic change with pedal travel; no sudden drops, jumps or open-circuit (>10 V or floating)
  • Expected wiring continuity: low resistance between ECU reference and pedal reference pin (usually < 1 Ω if short harness)
  • Ground continuity: solid connection from pedal ground to vehicle chassis/ECU ground

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data with an appropriate BMW-compatible scan tool. Note related throttle/pedal codes.
  2. Inspect pedal connector and harness for damage, corrosion or moisture; repair or replace connector/terminal if damaged.
  3. With ignition ON (engine off), back-probe the pedal connector: verify reference (≈5 V) and ground presence. Do NOT short terminals.
  4. Back-probe the channel 1 signal and slowly operate the pedal while monitoring voltage on a DVOM or scope; look for smooth, continuous change.
  5. If reference is missing or out of range, trace and test continuity between ECU reference pin and pedal reference pin; repair open/shorts found.
  6. If signal is erratic only at pedal, disconnect pedal and check resistance/continuity of the sensor/ potentiometer per BMW specs; replace pedal module if out of tolerance.
  7. If wiring and pedal check OK, test ECU supply/reference driver for faults (consult wiring diagrams and manufacturer procedures) — do not replace ECU without thorough testing.
  8. After repairs, clear codes and perform a road test while monitoring live PPS channels and driveability. Confirm code does not return.
  9. Safety note: Follow manufacturer procedures for live testing and take care when probing live circuits; avoid shorting pins together.

Likely causes

  • Broken or corroded connector at accelerator pedal module
  • Open or shorted supply/reference wire between ECU and pedal sensor
  • Internal failure of the pedal potentiometer (channel 1)
  • Loose or corroded ground related to pedal/ECU
  • Aftermarket wiring damage or previous improper repair

Fault status

⚠️ Status
P1624 — Pedal Position Sensor (potentiometer) supply channel 1 electrical fault detected. Indicates open/short/intermittent condition in supply or wiring to channel 1 of the pedal potentiometer; may cause CEL and reduced engine power.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0120 P0122 P0123 P2135 P1604
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Code

P1624

MITSUBISHI P — Powertrain

Injection pump (Q adjust ROM)

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high-resistance in the 5 V reference/supply wire to PPS channel 1
  • Damaged or corroded PPS connector or pins
  • Short to battery voltage or ground in the signal or supply wiring
  • Failed pedal position sensor (potentiometer) internal to the accelerator pedal module
  • Faulty engine/drive control module (ECU) supply/reference driver
  • Poor ground(s) related to the pedal sensor circuit

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • Reduced engine power / limp-home mode
  • Unstable or unresponsive accelerator pedal feel
  • Engine hesitation, surging or unexpected throttle behavior
  • Driveability complaints immediately after wiring movement or moisture exposure

What to check

  • Read and record freeze-frame and live data with a scan tool; observe PPS channel 1 value and compare to channel 2 (if present).
  • Visually inspect accelerator pedal connector and harness for corrosion, pins pushed out, water or damage.
  • Check reference supply voltage at the pedal connector with ignition ON (do not crank) — compare to factory spec (typically ~5 V).
  • Measure pedal signal voltage while slowly operating pedal — look for smooth change without dropouts or jumps.
  • Perform continuity and resistance checks from ECU reference pin to pedal connector, and signal return/ground continuity to chassis ground.
  • Wiggle test harness while observing live data and voltages to find intermittent faults.

Signal parameters

  • Reference/supply voltage: typically ~5.0 V (manufacturer tolerance ±0.25 V) at pedal connector with ignition ON
  • Sensor output (channel 1): variable DC voltage; common range ~0.5 V (rest) to ~4.5 V (full pedal travel)
  • Signal behavior: smooth, monotonic change with pedal travel; no sudden drops, jumps or open-circuit (>10 V or floating)
  • Expected wiring continuity: low resistance between ECU reference and pedal reference pin (usually < 1 Ω if short harness)
  • Ground continuity: solid connection from pedal ground to vehicle chassis/ECU ground

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data with an appropriate BMW-compatible scan tool. Note related throttle/pedal codes.
  2. Inspect pedal connector and harness for damage, corrosion or moisture; repair or replace connector/terminal if damaged.
  3. With ignition ON (engine off), back-probe the pedal connector: verify reference (≈5 V) and ground presence. Do NOT short terminals.
  4. Back-probe the channel 1 signal and slowly operate the pedal while monitoring voltage on a DVOM or scope; look for smooth, continuous change.
  5. If reference is missing or out of range, trace and test continuity between ECU reference pin and pedal reference pin; repair open/shorts found.
  6. If signal is erratic only at pedal, disconnect pedal and check resistance/continuity of the sensor/ potentiometer per BMW specs; replace pedal module if out of tolerance.
  7. If wiring and pedal check OK, test ECU supply/reference driver for faults (consult wiring diagrams and manufacturer procedures) — do not replace ECU without thorough testing.
  8. After repairs, clear codes and perform a road test while monitoring live PPS channels and driveability. Confirm code does not return.
  9. Safety note: Follow manufacturer procedures for live testing and take care when probing live circuits; avoid shorting pins together.

Likely causes

  • Broken or corroded connector at accelerator pedal module
  • Open or shorted supply/reference wire between ECU and pedal sensor
  • Internal failure of the pedal potentiometer (channel 1)
  • Loose or corroded ground related to pedal/ECU
  • Aftermarket wiring damage or previous improper repair

Fault status

⚠️ Status
P1624 — Pedal Position Sensor (potentiometer) supply channel 1 electrical fault detected. Indicates open/short/intermittent condition in supply or wiring to channel 1 of the pedal potentiometer; may cause CEL and reduced engine power.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0120 P0122 P0123 P2135 P1604
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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Code

P1624

OLDSMOBILE P — Powertrain

Customer Snapshot Data Available

Brand: OLDSMOBILE
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high-resistance in the 5 V reference/supply wire to PPS channel 1
  • Damaged or corroded PPS connector or pins
  • Short to battery voltage or ground in the signal or supply wiring
  • Failed pedal position sensor (potentiometer) internal to the accelerator pedal module
  • Faulty engine/drive control module (ECU) supply/reference driver
  • Poor ground(s) related to the pedal sensor circuit

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • Reduced engine power / limp-home mode
  • Unstable or unresponsive accelerator pedal feel
  • Engine hesitation, surging or unexpected throttle behavior
  • Driveability complaints immediately after wiring movement or moisture exposure

What to check

  • Read and record freeze-frame and live data with a scan tool; observe PPS channel 1 value and compare to channel 2 (if present).
  • Visually inspect accelerator pedal connector and harness for corrosion, pins pushed out, water or damage.
  • Check reference supply voltage at the pedal connector with ignition ON (do not crank) — compare to factory spec (typically ~5 V).
  • Measure pedal signal voltage while slowly operating pedal — look for smooth change without dropouts or jumps.
  • Perform continuity and resistance checks from ECU reference pin to pedal connector, and signal return/ground continuity to chassis ground.
  • Wiggle test harness while observing live data and voltages to find intermittent faults.

Signal parameters

  • Reference/supply voltage: typically ~5.0 V (manufacturer tolerance ±0.25 V) at pedal connector with ignition ON
  • Sensor output (channel 1): variable DC voltage; common range ~0.5 V (rest) to ~4.5 V (full pedal travel)
  • Signal behavior: smooth, monotonic change with pedal travel; no sudden drops, jumps or open-circuit (>10 V or floating)
  • Expected wiring continuity: low resistance between ECU reference and pedal reference pin (usually < 1 Ω if short harness)
  • Ground continuity: solid connection from pedal ground to vehicle chassis/ECU ground

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data with an appropriate BMW-compatible scan tool. Note related throttle/pedal codes.
  2. Inspect pedal connector and harness for damage, corrosion or moisture; repair or replace connector/terminal if damaged.
  3. With ignition ON (engine off), back-probe the pedal connector: verify reference (≈5 V) and ground presence. Do NOT short terminals.
  4. Back-probe the channel 1 signal and slowly operate the pedal while monitoring voltage on a DVOM or scope; look for smooth, continuous change.
  5. If reference is missing or out of range, trace and test continuity between ECU reference pin and pedal reference pin; repair open/shorts found.
  6. If signal is erratic only at pedal, disconnect pedal and check resistance/continuity of the sensor/ potentiometer per BMW specs; replace pedal module if out of tolerance.
  7. If wiring and pedal check OK, test ECU supply/reference driver for faults (consult wiring diagrams and manufacturer procedures) — do not replace ECU without thorough testing.
  8. After repairs, clear codes and perform a road test while monitoring live PPS channels and driveability. Confirm code does not return.
  9. Safety note: Follow manufacturer procedures for live testing and take care when probing live circuits; avoid shorting pins together.

Likely causes

  • Broken or corroded connector at accelerator pedal module
  • Open or shorted supply/reference wire between ECU and pedal sensor
  • Internal failure of the pedal potentiometer (channel 1)
  • Loose or corroded ground related to pedal/ECU
  • Aftermarket wiring damage or previous improper repair

Fault status

⚠️ Status
P1624 — Pedal Position Sensor (potentiometer) supply channel 1 electrical fault detected. Indicates open/short/intermittent condition in supply or wiring to channel 1 of the pedal potentiometer; may cause CEL and reduced engine power.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0120 P0122 P0123 P2135 P1604
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Code

P1624

Other P — Powertrain

Anti Theft System

Brand: Other
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high-resistance in the 5 V reference/supply wire to PPS channel 1
  • Damaged or corroded PPS connector or pins
  • Short to battery voltage or ground in the signal or supply wiring
  • Failed pedal position sensor (potentiometer) internal to the accelerator pedal module
  • Faulty engine/drive control module (ECU) supply/reference driver
  • Poor ground(s) related to the pedal sensor circuit

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • Reduced engine power / limp-home mode
  • Unstable or unresponsive accelerator pedal feel
  • Engine hesitation, surging or unexpected throttle behavior
  • Driveability complaints immediately after wiring movement or moisture exposure

What to check

  • Read and record freeze-frame and live data with a scan tool; observe PPS channel 1 value and compare to channel 2 (if present).
  • Visually inspect accelerator pedal connector and harness for corrosion, pins pushed out, water or damage.
  • Check reference supply voltage at the pedal connector with ignition ON (do not crank) — compare to factory spec (typically ~5 V).
  • Measure pedal signal voltage while slowly operating pedal — look for smooth change without dropouts or jumps.
  • Perform continuity and resistance checks from ECU reference pin to pedal connector, and signal return/ground continuity to chassis ground.
  • Wiggle test harness while observing live data and voltages to find intermittent faults.

Signal parameters

  • Reference/supply voltage: typically ~5.0 V (manufacturer tolerance ±0.25 V) at pedal connector with ignition ON
  • Sensor output (channel 1): variable DC voltage; common range ~0.5 V (rest) to ~4.5 V (full pedal travel)
  • Signal behavior: smooth, monotonic change with pedal travel; no sudden drops, jumps or open-circuit (>10 V or floating)
  • Expected wiring continuity: low resistance between ECU reference and pedal reference pin (usually < 1 Ω if short harness)
  • Ground continuity: solid connection from pedal ground to vehicle chassis/ECU ground

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data with an appropriate BMW-compatible scan tool. Note related throttle/pedal codes.
  2. Inspect pedal connector and harness for damage, corrosion or moisture; repair or replace connector/terminal if damaged.
  3. With ignition ON (engine off), back-probe the pedal connector: verify reference (≈5 V) and ground presence. Do NOT short terminals.
  4. Back-probe the channel 1 signal and slowly operate the pedal while monitoring voltage on a DVOM or scope; look for smooth, continuous change.
  5. If reference is missing or out of range, trace and test continuity between ECU reference pin and pedal reference pin; repair open/shorts found.
  6. If signal is erratic only at pedal, disconnect pedal and check resistance/continuity of the sensor/ potentiometer per BMW specs; replace pedal module if out of tolerance.
  7. If wiring and pedal check OK, test ECU supply/reference driver for faults (consult wiring diagrams and manufacturer procedures) — do not replace ECU without thorough testing.
  8. After repairs, clear codes and perform a road test while monitoring live PPS channels and driveability. Confirm code does not return.
  9. Safety note: Follow manufacturer procedures for live testing and take care when probing live circuits; avoid shorting pins together.

Likely causes

  • Broken or corroded connector at accelerator pedal module
  • Open or shorted supply/reference wire between ECU and pedal sensor
  • Internal failure of the pedal potentiometer (channel 1)
  • Loose or corroded ground related to pedal/ECU
  • Aftermarket wiring damage or previous improper repair

Fault status

⚠️ Status
P1624 — Pedal Position Sensor (potentiometer) supply channel 1 electrical fault detected. Indicates open/short/intermittent condition in supply or wiring to channel 1 of the pedal potentiometer; may cause CEL and reduced engine power.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0120 P0122 P0123 P2135 P1604
8,898

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Code

P1624

SAAB P — Powertrain

Automatic Transmission Has Stored Emission Related Fault

Brand: SAAB
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high-resistance in the 5 V reference/supply wire to PPS channel 1
  • Damaged or corroded PPS connector or pins
  • Short to battery voltage or ground in the signal or supply wiring
  • Failed pedal position sensor (potentiometer) internal to the accelerator pedal module
  • Faulty engine/drive control module (ECU) supply/reference driver
  • Poor ground(s) related to the pedal sensor circuit

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • Reduced engine power / limp-home mode
  • Unstable or unresponsive accelerator pedal feel
  • Engine hesitation, surging or unexpected throttle behavior
  • Driveability complaints immediately after wiring movement or moisture exposure

What to check

  • Read and record freeze-frame and live data with a scan tool; observe PPS channel 1 value and compare to channel 2 (if present).
  • Visually inspect accelerator pedal connector and harness for corrosion, pins pushed out, water or damage.
  • Check reference supply voltage at the pedal connector with ignition ON (do not crank) — compare to factory spec (typically ~5 V).
  • Measure pedal signal voltage while slowly operating pedal — look for smooth change without dropouts or jumps.
  • Perform continuity and resistance checks from ECU reference pin to pedal connector, and signal return/ground continuity to chassis ground.
  • Wiggle test harness while observing live data and voltages to find intermittent faults.

Signal parameters

  • Reference/supply voltage: typically ~5.0 V (manufacturer tolerance ±0.25 V) at pedal connector with ignition ON
  • Sensor output (channel 1): variable DC voltage; common range ~0.5 V (rest) to ~4.5 V (full pedal travel)
  • Signal behavior: smooth, monotonic change with pedal travel; no sudden drops, jumps or open-circuit (>10 V or floating)
  • Expected wiring continuity: low resistance between ECU reference and pedal reference pin (usually < 1 Ω if short harness)
  • Ground continuity: solid connection from pedal ground to vehicle chassis/ECU ground

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data with an appropriate BMW-compatible scan tool. Note related throttle/pedal codes.
  2. Inspect pedal connector and harness for damage, corrosion or moisture; repair or replace connector/terminal if damaged.
  3. With ignition ON (engine off), back-probe the pedal connector: verify reference (≈5 V) and ground presence. Do NOT short terminals.
  4. Back-probe the channel 1 signal and slowly operate the pedal while monitoring voltage on a DVOM or scope; look for smooth, continuous change.
  5. If reference is missing or out of range, trace and test continuity between ECU reference pin and pedal reference pin; repair open/shorts found.
  6. If signal is erratic only at pedal, disconnect pedal and check resistance/continuity of the sensor/ potentiometer per BMW specs; replace pedal module if out of tolerance.
  7. If wiring and pedal check OK, test ECU supply/reference driver for faults (consult wiring diagrams and manufacturer procedures) — do not replace ECU without thorough testing.
  8. After repairs, clear codes and perform a road test while monitoring live PPS channels and driveability. Confirm code does not return.
  9. Safety note: Follow manufacturer procedures for live testing and take care when probing live circuits; avoid shorting pins together.

Likely causes

  • Broken or corroded connector at accelerator pedal module
  • Open or shorted supply/reference wire between ECU and pedal sensor
  • Internal failure of the pedal potentiometer (channel 1)
  • Loose or corroded ground related to pedal/ECU
  • Aftermarket wiring damage or previous improper repair

Fault status

⚠️ Status
P1624 — Pedal Position Sensor (potentiometer) supply channel 1 electrical fault detected. Indicates open/short/intermittent condition in supply or wiring to channel 1 of the pedal potentiometer; may cause CEL and reduced engine power.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0120 P0122 P0123 P2135 P1604
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Code

P1624

SATURN P — Powertrain

Customer Snapshot Data Available

Brand: SATURN
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high-resistance in the 5 V reference/supply wire to PPS channel 1
  • Damaged or corroded PPS connector or pins
  • Short to battery voltage or ground in the signal or supply wiring
  • Failed pedal position sensor (potentiometer) internal to the accelerator pedal module
  • Faulty engine/drive control module (ECU) supply/reference driver
  • Poor ground(s) related to the pedal sensor circuit

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • Reduced engine power / limp-home mode
  • Unstable or unresponsive accelerator pedal feel
  • Engine hesitation, surging or unexpected throttle behavior
  • Driveability complaints immediately after wiring movement or moisture exposure

What to check

  • Read and record freeze-frame and live data with a scan tool; observe PPS channel 1 value and compare to channel 2 (if present).
  • Visually inspect accelerator pedal connector and harness for corrosion, pins pushed out, water or damage.
  • Check reference supply voltage at the pedal connector with ignition ON (do not crank) — compare to factory spec (typically ~5 V).
  • Measure pedal signal voltage while slowly operating pedal — look for smooth change without dropouts or jumps.
  • Perform continuity and resistance checks from ECU reference pin to pedal connector, and signal return/ground continuity to chassis ground.
  • Wiggle test harness while observing live data and voltages to find intermittent faults.

Signal parameters

  • Reference/supply voltage: typically ~5.0 V (manufacturer tolerance ±0.25 V) at pedal connector with ignition ON
  • Sensor output (channel 1): variable DC voltage; common range ~0.5 V (rest) to ~4.5 V (full pedal travel)
  • Signal behavior: smooth, monotonic change with pedal travel; no sudden drops, jumps or open-circuit (>10 V or floating)
  • Expected wiring continuity: low resistance between ECU reference and pedal reference pin (usually < 1 Ω if short harness)
  • Ground continuity: solid connection from pedal ground to vehicle chassis/ECU ground

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data with an appropriate BMW-compatible scan tool. Note related throttle/pedal codes.
  2. Inspect pedal connector and harness for damage, corrosion or moisture; repair or replace connector/terminal if damaged.
  3. With ignition ON (engine off), back-probe the pedal connector: verify reference (≈5 V) and ground presence. Do NOT short terminals.
  4. Back-probe the channel 1 signal and slowly operate the pedal while monitoring voltage on a DVOM or scope; look for smooth, continuous change.
  5. If reference is missing or out of range, trace and test continuity between ECU reference pin and pedal reference pin; repair open/shorts found.
  6. If signal is erratic only at pedal, disconnect pedal and check resistance/continuity of the sensor/ potentiometer per BMW specs; replace pedal module if out of tolerance.
  7. If wiring and pedal check OK, test ECU supply/reference driver for faults (consult wiring diagrams and manufacturer procedures) — do not replace ECU without thorough testing.
  8. After repairs, clear codes and perform a road test while monitoring live PPS channels and driveability. Confirm code does not return.
  9. Safety note: Follow manufacturer procedures for live testing and take care when probing live circuits; avoid shorting pins together.

Likely causes

  • Broken or corroded connector at accelerator pedal module
  • Open or shorted supply/reference wire between ECU and pedal sensor
  • Internal failure of the pedal potentiometer (channel 1)
  • Loose or corroded ground related to pedal/ECU
  • Aftermarket wiring damage or previous improper repair

Fault status

⚠️ Status
P1624 — Pedal Position Sensor (potentiometer) supply channel 1 electrical fault detected. Indicates open/short/intermittent condition in supply or wiring to channel 1 of the pedal potentiometer; may cause CEL and reduced engine power.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0120 P0122 P0123 P2135 P1604
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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1624

VOLKSWAGEN P — Powertrain

MIL Request Signal Active

Brand: VOLKSWAGEN
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short or high-resistance in the 5 V reference/supply wire to PPS channel 1
  • Damaged or corroded PPS connector or pins
  • Short to battery voltage or ground in the signal or supply wiring
  • Failed pedal position sensor (potentiometer) internal to the accelerator pedal module
  • Faulty engine/drive control module (ECU) supply/reference driver
  • Poor ground(s) related to the pedal sensor circuit

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • Reduced engine power / limp-home mode
  • Unstable or unresponsive accelerator pedal feel
  • Engine hesitation, surging or unexpected throttle behavior
  • Driveability complaints immediately after wiring movement or moisture exposure

What to check

  • Read and record freeze-frame and live data with a scan tool; observe PPS channel 1 value and compare to channel 2 (if present).
  • Visually inspect accelerator pedal connector and harness for corrosion, pins pushed out, water or damage.
  • Check reference supply voltage at the pedal connector with ignition ON (do not crank) — compare to factory spec (typically ~5 V).
  • Measure pedal signal voltage while slowly operating pedal — look for smooth change without dropouts or jumps.
  • Perform continuity and resistance checks from ECU reference pin to pedal connector, and signal return/ground continuity to chassis ground.
  • Wiggle test harness while observing live data and voltages to find intermittent faults.

Signal parameters

  • Reference/supply voltage: typically ~5.0 V (manufacturer tolerance ±0.25 V) at pedal connector with ignition ON
  • Sensor output (channel 1): variable DC voltage; common range ~0.5 V (rest) to ~4.5 V (full pedal travel)
  • Signal behavior: smooth, monotonic change with pedal travel; no sudden drops, jumps or open-circuit (>10 V or floating)
  • Expected wiring continuity: low resistance between ECU reference and pedal reference pin (usually < 1 Ω if short harness)
  • Ground continuity: solid connection from pedal ground to vehicle chassis/ECU ground

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data with an appropriate BMW-compatible scan tool. Note related throttle/pedal codes.
  2. Inspect pedal connector and harness for damage, corrosion or moisture; repair or replace connector/terminal if damaged.
  3. With ignition ON (engine off), back-probe the pedal connector: verify reference (≈5 V) and ground presence. Do NOT short terminals.
  4. Back-probe the channel 1 signal and slowly operate the pedal while monitoring voltage on a DVOM or scope; look for smooth, continuous change.
  5. If reference is missing or out of range, trace and test continuity between ECU reference pin and pedal reference pin; repair open/shorts found.
  6. If signal is erratic only at pedal, disconnect pedal and check resistance/continuity of the sensor/ potentiometer per BMW specs; replace pedal module if out of tolerance.
  7. If wiring and pedal check OK, test ECU supply/reference driver for faults (consult wiring diagrams and manufacturer procedures) — do not replace ECU without thorough testing.
  8. After repairs, clear codes and perform a road test while monitoring live PPS channels and driveability. Confirm code does not return.
  9. Safety note: Follow manufacturer procedures for live testing and take care when probing live circuits; avoid shorting pins together.

Likely causes

  • Broken or corroded connector at accelerator pedal module
  • Open or shorted supply/reference wire between ECU and pedal sensor
  • Internal failure of the pedal potentiometer (channel 1)
  • Loose or corroded ground related to pedal/ECU
  • Aftermarket wiring damage or previous improper repair

Fault status

⚠️ Status
P1624 — Pedal Position Sensor (potentiometer) supply channel 1 electrical fault detected. Indicates open/short/intermittent condition in supply or wiring to channel 1 of the pedal potentiometer; may cause CEL and reduced engine power.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0120 P0122 P0123 P2135 P1604
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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