Powertrain Codes

P0528

Technical Definition:

Fan Speed Sensor Circuit No Signal

Trouble Code: P0528
Address: 0x0528
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:
  • Faulty fan clutch or electric fan
  • Open circuit in cooling fan sensor harness or connector
  • Faulty PCM/ECM
  • Faulty cooling fan speed sensor
  • Accessory belt broken

Possible Symptoms:
  • Malfunction Indicator Lamp illumination (a.k.a. Check Engine Light)
  • Vehicle may be overheating or running hotter than normal

Fan Speed Sensor Circuit No Signal

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Fan Speed Sensor
– Fan Speed Sensor harness is open or shorted
– Fan Speed Sensor circuit poor electrical connection
– Faulty fan clutch
– Faulty PCM

Specific Makes:

– Engine overheating

P0529

Technical Definition:

Fan Speed Sensor Circuit Intermittent

Trouble Code: P0529
Address: 0x0529
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Some vehicles are equipped with a sensor at the end of the cooling fan that detects movement during vehicle operation. The sensor is used to determine if the fan is running on a fan clutch equipped vehicle, or used to verify fan speed commanded by the Powertrain Control Module (PCM) or Engine Control Module (ECM) matches the actual fan speed detected on an electric fan equipped vehicle.

Possible Causes:
  • Loose connection in cooling fan sensor harness or PCM/ECM harness
  • Faulty PCM/ECM
  • Faulty cooling fan speed sensor

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

P0523

Technical Definition:

Engine Oil Pressure Sensor / Switch High

Trouble Code: P0523
Address: 0x0523
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

Engine Oil Pressure Sensor/Switch Circuit High Voltage

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Low oil level or motor mechanical fault
– Faulty Oil Pressure sensor
– Oil Pressure Sensor harness is open or shorted
– Oil Pressure Sensor circuit poor electrical connection

Specific Makes:

– Oil pressure warning light ON

P0524

Technical Definition:

Engine Oil Pressure Too Low

Trouble Code: P0524
Address: 0x0524
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

Engine Oil Pressure Sensor/Switch Circuit

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Low oil level or motor mechanical fault
– Faulty Oil Pressure sensor
– Oil Pressure Sensor harness is open or shorted
– Oil Pressure Sensor circuit poor electrical connection

Specific Makes:

– Oil pressure warning light ON

P0525

Technical Definition:

Cruise Control Servo Control Circuit Range / Performance

Trouble Code: P0525
Address: 0x0525
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

Cruise Control Servo Control Circuit Range/Performance

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Cruise control servo control poor electrical connection
– Faulty cruise control servo

Specific Makes:

P0526

Technical Definition:

Fan Speed Sensor Circuit

Trouble Code: P0526
Address: 0x0526
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:
  • Faulty fan clutch, or electric fan
  • Open circuit in cooling fan sensor harness or loose connection
  • Faulty PCM/ECM
  • Faulty cooling fan speed sensor
  • Accessory belt broken

Possible Symptoms:
  • Malfunction Indicator Lamp illumination (Check Engine Light)
  • Vehicle may be overheating or running hotter than normal

Cooling Fan Speed Sensor Circuit

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Cooling fan harness and connector
– Faulty cooling fan

Specific Makes:

– Engine overheating

P0522

Technical Definition:

Engine Oil Pressure Sensor / Switch Low

Trouble Code: P0522
Address: 0x0522
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

Engine Oil Pressure Sensor/Switch Circuit Low Voltage

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Low oil level or motor mechanical fault
– Faulty Oil Pressure sensor
– Oil Pressure Sensor harness is open or shorted
– Oil Pressure Sensor circuit poor electrical connection

Specific Makes:

– Oil pressure warning light ON

P0520

Technical Definition:

Engine Oil Pressure Sensor / Switch Circuit

Trouble Code: P0520
Address: 0x0520
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

Engine Oil Pressure Sensor/Switch Circuit Malfunction

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Low oil level or motor mechanical fault
– Faulty Oil Pressure Sensor
– Oil Pressure Sensor harness is open or shorted
– Oil Pressure Sensor circuit poor electrical connection

Specific Makes:

– Oil pressure warning light ON.

P0521

Technical Definition:

Engine Oil Pressure Sensor / Switch Range / Performance

Trouble Code: P0521
Address: 0x0521
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

Engine Oil Pressure Sensor/Switch Circuit Range/Performance

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Low oil level or motor mechanical fault
– Faulty oil pressure sensor
– Oil Pressure Sensor harness is open or shorted
– Oil Pressure Sensor circuit poor electrical connection

Specific Makes:

– Oil pressure warning light ON.