Code
P1252
FORD
P — Powertrain
Pedal Correlation PDS1 and LPDS High
Views:
UK: 19
EN: 35
RU: 23
AI status
Completed
Completed
100%
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
- Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
- Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
- 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.
- 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.
- If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
- Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
- If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
- After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
- 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
Views:
UK: 17
EN: 34
RU: 20
AI status
Completed
Completed
100%
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
- Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
- Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
- 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.
- 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.
- If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
- Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
- If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
- After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
- 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
Views:
UK: 18
EN: 29
RU: 19
AI status
Completed
Completed
100%
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
- Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
- Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
- 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.
- 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.
- If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
- Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
- If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
- After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
- 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
Views:
UK: 5
EN: 12
RU: 4
AI status
Completed
Completed
100%
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
- Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
- Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
- 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.
- 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.
- If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
- Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
- If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
- After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
- 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
LINCOLN
P — Powertrain
Pedal Correlation PDS1 and LPDS High
Views:
UK: 21
EN: 36
RU: 21
AI status
Completed
Completed
100%
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
- Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
- Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
- 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.
- 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.
- If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
- Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
- If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
- After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
- 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
MAZDA
P — Powertrain
Pressure Regulator Control Solenoid 2 Circuit Malfunction
Views:
UK: 17
EN: 44
RU: 19
AI status
Completed
Completed
100%
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
- Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
- Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
- 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.
- 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.
- If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
- Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
- If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
- After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
- 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
Views:
UK: 19
EN: 37
RU: 22
AI status
Completed
Completed
100%
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
- Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
- Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
- 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.
- 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.
- If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
- Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
- If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
- After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
- 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
Other
P — Powertrain
Pedal Correlation PDS1 and LPDS High
Views:
UK: 20
EN: 31
RU: 19
AI status
Completed
Completed
100%
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
- Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
- Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
- 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.
- 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.
- If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
- Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
- If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
- After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
- 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
RAM
P — Powertrain
Vacuum Reservoir Control Circuit High
Views:
UK: 2
EN: 5
RU: 3
AI status
Completed
Completed
100%
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
- Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
- Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
- 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.
- 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.
- If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
- Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
- If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
- After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
- 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
SAAB
P — Powertrain
Check Engine Lamp, Output From Control Module High
Views:
UK: 1
EN: 2
RU: 2
AI status
Completed
Completed
100%
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
- Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
- Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
- 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.
- 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.
- If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
- Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
- If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
- After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
- 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
VOLKSWAGEN
P — Powertrain
Start Of Injection Solenoid Circuit Open/Short To Ground
Views:
UK: 21
EN: 33
RU: 24
AI status
Completed
Completed
100%
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
- Retrieve codes and freeze-frame data using a scan tool. Note stored related codes (throttle/pedal/PCM).
- Perform a visual inspection of the pedal sensor, connector and harness for damage, corrosion or water entry.
- 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.
- 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.
- If a sensor shows no change, erratic jumps, or is outside expected voltage range, inspect wiring for short/open and repair as needed.
- Perform wiggle test on harness/connectors while monitoring signals to find intermittent faults.
- If wiring and connectors check OK but sensor output is incorrect, replace the faulty pedal position sensor per OEM procedure.
- After repair, clear codes and perform a test drive/exercise throttle to confirm code does not return and driveability is restored.
- 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
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email