Code
P0551
Generic
P — Powertrain
Power Steering Pressure Sensor/Switch Circuit Range/Performance
Views:
UK: 25
EN: 37
RU: 35
AI status
Completed
Completed
100%
Causes
- Open, short, or high resistance in sensor signal, reference or ground circuit
- Faulty power steering pressure sensor or pressure switch
- Corroded or damaged connector at the sensor
- Blown fuse or loss of 5 V reference supply to the sensor
- Poor PCM ground or internal PCM fault (less common)
- Low power steering fluid, pump problems or mechanical blockage affecting pressure readings
Symptoms
- Malfunction Indicator Lamp (MIL) / trouble code stored
- Erratic idle or stalling in some cases (ECM uses pressure for load compensation)
- Reduced engine power or torque management while steering
- Possible increased steering effort or degraded steering assist (depending on system)
- Intermittent or no change in steering assist when turning wheel
What to check
- Read stored codes and freeze frame data with a scan tool; note engine speed, load and steering input at fault
- Visually inspect sensor, connector and wiring for corrosion, pin damage, chafing or fluid contamination
- Verify battery voltage and inspect related fuses and power distribution
- Backprobe sensor connector to measure reference, signal and ground with key ON and engine running
- Use a lab scope (preferred) or multimeter to observe signal behavior while turning the steering wheel (pressure changes should change voltage)
- Wiggle test wiring and connector while monitoring signal for intermittent faults
Signal parameters
- Reference supply: typically a regulated 5 V from the PCM (verify 4.8–5.2 V at sensor with key ON)
- Signal output (analog pressure sensor): approx. 0.5–4.5 V proportional to steering hydraulic pressure (varies by manufacturer)
- Switch output (if fitted): open/closed or low/high signal when pressure threshold is reached
- Expected behavior: signal voltage should change smoothly with steering input; no sudden drops to 0 V or short to battery voltage
- Typical continuity/impedance: low ohms to ground for ground circuit and stable resistance for signal circuit (manufacturer specs required for exact values)
Diagnostic algorithm
- Retrieve all codes and freeze frame data. Note conditions when P0551 set (engine temp, RPM, steering angle/input).
- Visually inspect the pressure sensor, harness, and connector for damage, contamination, or loose pins. Repair if found.
- With key ON (engine OFF), backprobe the sensor harness: verify 5 V reference present, good ground, and signal voltage within expected idle range.
- Start engine and monitor signal while turning steering lock-to-lock. Confirm signal changes smoothly with pressure. Use scope if available to view waveform.
- If signal is stuck high/low or erratic, unplug the sensor and re-check reference and ground at the harness connector to isolate wiring vs sensor.
- Perform continuity and resistance checks between sensor connector and PCM for reference, signal and ground to locate opens or shorts.
- Repair any damaged wiring, corroded connector, or poor ground. Replace sensor if wiring and supply checks are good but signal remains out of range.
- Clear codes and road-test under similar conditions that set the code. Re-scan and verify no return of P0551.
- If fault persists after sensor and wiring repair, consider PCM input circuit testing or replacement per manufacturer procedures.
Likely causes
- Damaged wiring or connector to pressure sensor (most common)
- Defective pressure sensor/switch
- Missing or unstable 5 V reference or bad ground at sensor
- Intermittent connector contact or water intrusion
Fault status
Status
Power Steering Pressure Sensor/Switch Circuit Range/Performance. PCM detects signal voltage or switch state outside expected parameters — check sensor, wiring, power/ground, and steering hydraulic system.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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Code
P0551
GWM
P — Powertrain
- Invalid indicator / the pressure sensor in the power steering has not been adjusted
Views:
UK: 10
EN: 9
RU: 7
AI status
Completed
Completed
100%
Causes
- Open, short, or high resistance in sensor signal, reference or ground circuit
- Faulty power steering pressure sensor or pressure switch
- Corroded or damaged connector at the sensor
- Blown fuse or loss of 5 V reference supply to the sensor
- Poor PCM ground or internal PCM fault (less common)
- Low power steering fluid, pump problems or mechanical blockage affecting pressure readings
Symptoms
- Malfunction Indicator Lamp (MIL) / trouble code stored
- Erratic idle or stalling in some cases (ECM uses pressure for load compensation)
- Reduced engine power or torque management while steering
- Possible increased steering effort or degraded steering assist (depending on system)
- Intermittent or no change in steering assist when turning wheel
What to check
- Read stored codes and freeze frame data with a scan tool; note engine speed, load and steering input at fault
- Visually inspect sensor, connector and wiring for corrosion, pin damage, chafing or fluid contamination
- Verify battery voltage and inspect related fuses and power distribution
- Backprobe sensor connector to measure reference, signal and ground with key ON and engine running
- Use a lab scope (preferred) or multimeter to observe signal behavior while turning the steering wheel (pressure changes should change voltage)
- Wiggle test wiring and connector while monitoring signal for intermittent faults
Signal parameters
- Reference supply: typically a regulated 5 V from the PCM (verify 4.8–5.2 V at sensor with key ON)
- Signal output (analog pressure sensor): approx. 0.5–4.5 V proportional to steering hydraulic pressure (varies by manufacturer)
- Switch output (if fitted): open/closed or low/high signal when pressure threshold is reached
- Expected behavior: signal voltage should change smoothly with steering input; no sudden drops to 0 V or short to battery voltage
- Typical continuity/impedance: low ohms to ground for ground circuit and stable resistance for signal circuit (manufacturer specs required for exact values)
Diagnostic algorithm
- Retrieve all codes and freeze frame data. Note conditions when P0551 set (engine temp, RPM, steering angle/input).
- Visually inspect the pressure sensor, harness, and connector for damage, contamination, or loose pins. Repair if found.
- With key ON (engine OFF), backprobe the sensor harness: verify 5 V reference present, good ground, and signal voltage within expected idle range.
- Start engine and monitor signal while turning steering lock-to-lock. Confirm signal changes smoothly with pressure. Use scope if available to view waveform.
- If signal is stuck high/low or erratic, unplug the sensor and re-check reference and ground at the harness connector to isolate wiring vs sensor.
- Perform continuity and resistance checks between sensor connector and PCM for reference, signal and ground to locate opens or shorts.
- Repair any damaged wiring, corroded connector, or poor ground. Replace sensor if wiring and supply checks are good but signal remains out of range.
- Clear codes and road-test under similar conditions that set the code. Re-scan and verify no return of P0551.
- If fault persists after sensor and wiring repair, consider PCM input circuit testing or replacement per manufacturer procedures.
Likely causes
- Damaged wiring or connector to pressure sensor (most common)
- Defective pressure sensor/switch
- Missing or unstable 5 V reference or bad ground at sensor
- Intermittent connector contact or water intrusion
Fault status
Status
Power Steering Pressure Sensor/Switch Circuit Range/Performance. PCM detects signal voltage or switch state outside expected parameters — check sensor, wiring, power/ground, and steering hydraulic system.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
Similar codes
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Code
P0551
HUMMER
P — Powertrain
Power Steering Pressure Sensor Circuit Range/Performance
Views:
UK: 11
EN: 18
RU: 21
AI status
Completed
Completed
100%
Causes
- Open, short, or high resistance in sensor signal, reference or ground circuit
- Faulty power steering pressure sensor or pressure switch
- Corroded or damaged connector at the sensor
- Blown fuse or loss of 5 V reference supply to the sensor
- Poor PCM ground or internal PCM fault (less common)
- Low power steering fluid, pump problems or mechanical blockage affecting pressure readings
Symptoms
- Malfunction Indicator Lamp (MIL) / trouble code stored
- Erratic idle or stalling in some cases (ECM uses pressure for load compensation)
- Reduced engine power or torque management while steering
- Possible increased steering effort or degraded steering assist (depending on system)
- Intermittent or no change in steering assist when turning wheel
What to check
- Read stored codes and freeze frame data with a scan tool; note engine speed, load and steering input at fault
- Visually inspect sensor, connector and wiring for corrosion, pin damage, chafing or fluid contamination
- Verify battery voltage and inspect related fuses and power distribution
- Backprobe sensor connector to measure reference, signal and ground with key ON and engine running
- Use a lab scope (preferred) or multimeter to observe signal behavior while turning the steering wheel (pressure changes should change voltage)
- Wiggle test wiring and connector while monitoring signal for intermittent faults
Signal parameters
- Reference supply: typically a regulated 5 V from the PCM (verify 4.8–5.2 V at sensor with key ON)
- Signal output (analog pressure sensor): approx. 0.5–4.5 V proportional to steering hydraulic pressure (varies by manufacturer)
- Switch output (if fitted): open/closed or low/high signal when pressure threshold is reached
- Expected behavior: signal voltage should change smoothly with steering input; no sudden drops to 0 V or short to battery voltage
- Typical continuity/impedance: low ohms to ground for ground circuit and stable resistance for signal circuit (manufacturer specs required for exact values)
Diagnostic algorithm
- Retrieve all codes and freeze frame data. Note conditions when P0551 set (engine temp, RPM, steering angle/input).
- Visually inspect the pressure sensor, harness, and connector for damage, contamination, or loose pins. Repair if found.
- With key ON (engine OFF), backprobe the sensor harness: verify 5 V reference present, good ground, and signal voltage within expected idle range.
- Start engine and monitor signal while turning steering lock-to-lock. Confirm signal changes smoothly with pressure. Use scope if available to view waveform.
- If signal is stuck high/low or erratic, unplug the sensor and re-check reference and ground at the harness connector to isolate wiring vs sensor.
- Perform continuity and resistance checks between sensor connector and PCM for reference, signal and ground to locate opens or shorts.
- Repair any damaged wiring, corroded connector, or poor ground. Replace sensor if wiring and supply checks are good but signal remains out of range.
- Clear codes and road-test under similar conditions that set the code. Re-scan and verify no return of P0551.
- If fault persists after sensor and wiring repair, consider PCM input circuit testing or replacement per manufacturer procedures.
Likely causes
- Damaged wiring or connector to pressure sensor (most common)
- Defective pressure sensor/switch
- Missing or unstable 5 V reference or bad ground at sensor
- Intermittent connector contact or water intrusion
Fault status
Status
Power Steering Pressure Sensor/Switch Circuit Range/Performance. PCM detects signal voltage or switch state outside expected parameters — check sensor, wiring, power/ground, and steering hydraulic system.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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Code
P0551
MERCEDES-BENZ
P — Powertrain
Power Steering Pressure Sensor Circuit Range/Performance
Views:
UK: 14
EN: 20
RU: 23
AI status
Completed
Completed
100%
Causes
- Open, short, or high resistance in sensor signal, reference or ground circuit
- Faulty power steering pressure sensor or pressure switch
- Corroded or damaged connector at the sensor
- Blown fuse or loss of 5 V reference supply to the sensor
- Poor PCM ground or internal PCM fault (less common)
- Low power steering fluid, pump problems or mechanical blockage affecting pressure readings
Symptoms
- Malfunction Indicator Lamp (MIL) / trouble code stored
- Erratic idle or stalling in some cases (ECM uses pressure for load compensation)
- Reduced engine power or torque management while steering
- Possible increased steering effort or degraded steering assist (depending on system)
- Intermittent or no change in steering assist when turning wheel
What to check
- Read stored codes and freeze frame data with a scan tool; note engine speed, load and steering input at fault
- Visually inspect sensor, connector and wiring for corrosion, pin damage, chafing or fluid contamination
- Verify battery voltage and inspect related fuses and power distribution
- Backprobe sensor connector to measure reference, signal and ground with key ON and engine running
- Use a lab scope (preferred) or multimeter to observe signal behavior while turning the steering wheel (pressure changes should change voltage)
- Wiggle test wiring and connector while monitoring signal for intermittent faults
Signal parameters
- Reference supply: typically a regulated 5 V from the PCM (verify 4.8–5.2 V at sensor with key ON)
- Signal output (analog pressure sensor): approx. 0.5–4.5 V proportional to steering hydraulic pressure (varies by manufacturer)
- Switch output (if fitted): open/closed or low/high signal when pressure threshold is reached
- Expected behavior: signal voltage should change smoothly with steering input; no sudden drops to 0 V or short to battery voltage
- Typical continuity/impedance: low ohms to ground for ground circuit and stable resistance for signal circuit (manufacturer specs required for exact values)
Diagnostic algorithm
- Retrieve all codes and freeze frame data. Note conditions when P0551 set (engine temp, RPM, steering angle/input).
- Visually inspect the pressure sensor, harness, and connector for damage, contamination, or loose pins. Repair if found.
- With key ON (engine OFF), backprobe the sensor harness: verify 5 V reference present, good ground, and signal voltage within expected idle range.
- Start engine and monitor signal while turning steering lock-to-lock. Confirm signal changes smoothly with pressure. Use scope if available to view waveform.
- If signal is stuck high/low or erratic, unplug the sensor and re-check reference and ground at the harness connector to isolate wiring vs sensor.
- Perform continuity and resistance checks between sensor connector and PCM for reference, signal and ground to locate opens or shorts.
- Repair any damaged wiring, corroded connector, or poor ground. Replace sensor if wiring and supply checks are good but signal remains out of range.
- Clear codes and road-test under similar conditions that set the code. Re-scan and verify no return of P0551.
- If fault persists after sensor and wiring repair, consider PCM input circuit testing or replacement per manufacturer procedures.
Likely causes
- Damaged wiring or connector to pressure sensor (most common)
- Defective pressure sensor/switch
- Missing or unstable 5 V reference or bad ground at sensor
- Intermittent connector contact or water intrusion
Fault status
Status
Power Steering Pressure Sensor/Switch Circuit Range/Performance. PCM detects signal voltage or switch state outside expected parameters — check sensor, wiring, power/ground, and steering hydraulic system.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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Code
P0551
MITSUBISHI
P — Powertrain
Power steering pressure switch
Views:
UK: 11
EN: 16
RU: 19
AI status
Completed
Completed
100%
Causes
- Open, short, or high resistance in sensor signal, reference or ground circuit
- Faulty power steering pressure sensor or pressure switch
- Corroded or damaged connector at the sensor
- Blown fuse or loss of 5 V reference supply to the sensor
- Poor PCM ground or internal PCM fault (less common)
- Low power steering fluid, pump problems or mechanical blockage affecting pressure readings
Symptoms
- Malfunction Indicator Lamp (MIL) / trouble code stored
- Erratic idle or stalling in some cases (ECM uses pressure for load compensation)
- Reduced engine power or torque management while steering
- Possible increased steering effort or degraded steering assist (depending on system)
- Intermittent or no change in steering assist when turning wheel
What to check
- Read stored codes and freeze frame data with a scan tool; note engine speed, load and steering input at fault
- Visually inspect sensor, connector and wiring for corrosion, pin damage, chafing or fluid contamination
- Verify battery voltage and inspect related fuses and power distribution
- Backprobe sensor connector to measure reference, signal and ground with key ON and engine running
- Use a lab scope (preferred) or multimeter to observe signal behavior while turning the steering wheel (pressure changes should change voltage)
- Wiggle test wiring and connector while monitoring signal for intermittent faults
Signal parameters
- Reference supply: typically a regulated 5 V from the PCM (verify 4.8–5.2 V at sensor with key ON)
- Signal output (analog pressure sensor): approx. 0.5–4.5 V proportional to steering hydraulic pressure (varies by manufacturer)
- Switch output (if fitted): open/closed or low/high signal when pressure threshold is reached
- Expected behavior: signal voltage should change smoothly with steering input; no sudden drops to 0 V or short to battery voltage
- Typical continuity/impedance: low ohms to ground for ground circuit and stable resistance for signal circuit (manufacturer specs required for exact values)
Diagnostic algorithm
- Retrieve all codes and freeze frame data. Note conditions when P0551 set (engine temp, RPM, steering angle/input).
- Visually inspect the pressure sensor, harness, and connector for damage, contamination, or loose pins. Repair if found.
- With key ON (engine OFF), backprobe the sensor harness: verify 5 V reference present, good ground, and signal voltage within expected idle range.
- Start engine and monitor signal while turning steering lock-to-lock. Confirm signal changes smoothly with pressure. Use scope if available to view waveform.
- If signal is stuck high/low or erratic, unplug the sensor and re-check reference and ground at the harness connector to isolate wiring vs sensor.
- Perform continuity and resistance checks between sensor connector and PCM for reference, signal and ground to locate opens or shorts.
- Repair any damaged wiring, corroded connector, or poor ground. Replace sensor if wiring and supply checks are good but signal remains out of range.
- Clear codes and road-test under similar conditions that set the code. Re-scan and verify no return of P0551.
- If fault persists after sensor and wiring repair, consider PCM input circuit testing or replacement per manufacturer procedures.
Likely causes
- Damaged wiring or connector to pressure sensor (most common)
- Defective pressure sensor/switch
- Missing or unstable 5 V reference or bad ground at sensor
- Intermittent connector contact or water intrusion
Fault status
Status
Power Steering Pressure Sensor/Switch Circuit Range/Performance. PCM detects signal voltage or switch state outside expected parameters — check sensor, wiring, power/ground, and steering hydraulic system.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
Similar codes
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Was this AI description helpful?
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Send to email