P05xx OBD-II Codes (P0500–P0599)
100 fault codes in the P05xx range. Click any code for causes, diagnostic steps, severity, and common fixes.
P0500 serious
Vehicle Speed Sensor "A" Malfunction
P0501 moderate
Vehicle Speed Sensor A Range/Performance
P0502 moderate
Vehicle Speed Sensor A Circuit Low Input
P0503 moderate
Vehicle Speed Sensor A Intermittent/Erratic/High
P0504 moderate
Brake Switch A/B Correlation
P0505 moderate
Idle Control System Malfunction
P0506 low
Idle Air Control System RPM Lower Than Expected
P0507 moderate
Idle Control System RPM High
P0508 moderate
Idle Air Control System Circuit Low
P0509 moderate
Idle Air Control System Circuit High
P0510 moderate
Closed Throttle Position Switch Malfunction
P0511 moderate
Idle Air Control Circuit
P0512 moderate
Starter Request Circuit
P0513 critical
Incorrect Immobilizer Key
P0514 low
Battery Temperature Sensor Circuit Range/Performance
P0515 low
Battery Temperature Sensor Circuit High
P0516 low
Battery Temperature Sensor Circuit Low
P0517 moderate
Engine Coolant Temperature Sensor Circuit Intermittent (Bank 1)
P0518 moderate
Idle Air Control Circuit Intermittent
P0519 moderate
Idle Air Control System Performance
P0520 critical
Engine Oil Pressure Sensor/Switch Circuit
P0521 critical
Engine Oil Pressure Sensor/Switch Range/Performance
P0522 critical
Engine Oil Pressure Sensor/Switch Low Voltage
P0523 moderate
Engine Oil Pressure Sensor/Switch High Voltage
P0524 critical
Engine Oil Pressure Too Low
P0525 critical
Engine Oil Pressure Control Circuit Range/Performance
P0526 moderate
Cooling Fan Speed Sensor Circuit
P0527 moderate
Cooling Fan Speed Sensor Circuit Range/Performance
P0528 moderate
Cooling Fan Speed Sensor Circuit No Signal
P0529 low
Cooling Fan Speed Sensor Circuit Intermittent
P0530 low
A/C Refrigerant Pressure Sensor A Circuit
P0531 low
A/C Refrigerant Pressure Sensor A Circuit Range/Performance
P0532 low
A/C Refrigerant Pressure Sensor A Circuit Low
P0533 low
A/C Refrigerant Pressure Sensor A Circuit High
P0534 low
Air Conditioner Refrigerant Charge Loss
P0535 low
Evaporator Temperature Sensor Circuit
P0536 low
Evaporator Temperature Sensor Circuit Range/Performance
P0537 low
Evaporator Temperature Sensor Circuit Low
P0538 low
Evaporator Temperature Sensor Circuit High
P0539 moderate
Intake Air Heater Circuit (Bank 1)
P0540 moderate
Intake Air Heater A Circuit
P0541 moderate
Intake Air Heater A Circuit Low
P0542 moderate
Intake Air Heater A Circuit High
P0543 moderate
Intake Air Heater A Circuit Open
P0544 moderate
Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 1)
P0545 moderate
Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 1)
P0546 moderate
Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 1)
P0547 moderate
Exhaust Gas Temperature Sensor Circuit (Bank 2 Sensor 1)
P0548 moderate
Exhaust Gas Temperature Sensor Circuit Low (Bank 2 Sensor 1)
P0549 moderate
Exhaust Gas Temperature Sensor Circuit High (Bank 2 Sensor 1)
P0550 low
Power Steering Pressure Sensor/Switch Circuit
P0551 low
Power Steering Pressure Sensor/Switch Range/Performance
P0552 low
Power Steering Pressure Sensor/Switch Circuit Low Input
P0553 low
Power Steering Pressure Sensor/Switch Circuit High Input
P0554 low
Power Steering Pressure Sensor/Switch Intermittent
P0555 moderate
Brake Booster Pressure Sensor Circuit
P0556 moderate
Brake Booster Pressure Sensor Circuit Range/Performance
P0557 moderate
Brake Booster Pressure Sensor Circuit Low
P0558 moderate
Brake Booster Pressure Sensor Circuit High
P0559 low
Brake Booster Pressure Sensor Circuit Intermittent
P0560 moderate
System Voltage Malfunction
P0561 moderate
System Voltage Unstable
P0562 serious
System Voltage Low
P0563 moderate
System Voltage High
P0564 low
Cruise Control Multi-Function Input A Circuit
P0565 low
Cruise Control On Signal Malfunction
P0566 low
Cruise Control Off Signal Malfunction
P0567 low
Cruise Control Resume Signal Malfunction
P0568 low
Cruise Control Set Signal Malfunction
P0569 low
Cruise Control Coast Signal Malfunction
P0570 low
Cruise Control Accel Signal Malfunction
P0571 moderate
Cruise Control/Brake Switch A Circuit
P0572 moderate
Cruise Control/Brake Switch A Circuit Low
P0573 moderate
Cruise Control/Brake Switch A Circuit High
P0574 moderate
Cruise Control System - Vehicle Speed Too High
P0575 low
Cruise Control Input Circuit
P0576 low
Cruise Control Input Circuit Low
P0577 low
Cruise Control Input Circuit High
P0578 low
Cruise Control Multi-Function Input A Circuit Stuck
P0579 low
Cruise Control Multi-Function Input B Circuit Stuck
P0580 low
Cruise Control Multi-Function Input A Circuit Low
P0581 low
Cruise Control Multi-Function Input A Circuit High
P0582 low
Cruise Control Vacuum Control Circuit Open
P0583 low
Cruise Control Vacuum Control Circuit Low
P0584 low
Cruise Control Vacuum Control Circuit High
P0585 low
Cruise Control Multi-Function Input B Circuit
P0586 low
Cruise Control Multi-Function Input B Circuit Low
P0587 low
Cruise Control Multi-Function Input B Circuit High
P0588 low
Cruise Control Vent Control Circuit Open
P0589 low
Cruise Control Vent Control Circuit Low
P0590 low
Cruise Control Vent Control Circuit High
P0591 low
Cruise Control Multi-Function Input A Circuit Range/Performance
P0592 low
Cruise Control Multi-Function Input B Circuit Range/Performance
P0593 low
Cruise Control System - Processor Malfunction
P0594 low
Cruise Control System - Servo Locked High
P0595 low
Cruise Control Servo Control Circuit Open
P0596 low
Cruise Control Servo Control Circuit Low
P0597 moderate
Thermostat Heater Control Circuit Open
P0598 moderate
Thermostat Heater Control Circuit Low
P0599 moderate
Thermostat Heater Control Circuit High