Powertrain Codes

P0545

Technical Definition:

Exhaust Gas Temperature Sensor Circuit Low (Bank 1 – Sensor 1)

Trouble Code: P0545
Address: 0x0545
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 1

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Exhaust Gas Temperature Sensor
– Exhaust Gas Temperature Sensor harness is open or shorted
– Exhaust Gas Temperature Sensor circuit poor electrical connection

Specific Makes:

P0540

Technical Definition:

Intake Air Heater A Circuit Malfunction

Trouble Code: P0540
Address: 0x0540
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

Intake Air Heater Feedback Circuit

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

P0541

Technical Definition:

Intake Air Heater A Circuit Low

Trouble Code: P0541
Address: 0x0541
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

Intake Air Heater Relay 1 Low

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Intake Air Heater Relay
– Intake Air Heater Relay harness is open or shorted
– Intake Air Heater Relay circuit poor electrical connection

Specific Makes:

P053B

Technical Definition:

Positive Crankcase Ventilation Heater Control Circuit Low

Trouble Code: P053B
Address: 0x053B
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

P053C

Technical Definition:

Positive Crankcase Ventilation Heater Control Circuit High

Trouble Code: P053C
Address: 0x053C
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

P0539

Technical Definition:

Air Conditioning (A/C) Evaporator Temperature Sensor Circuit Intermittent

Trouble Code: P0539
Address: 0x0539
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

A/C Evaporator Temperature Circuit Intermittent

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty A/C Evaporator Temperature Sensor
– A/C Evaporator Temperature Sensor harness is open or shorted
– A/C Evaporator Temperature Sensor circuit poor electrical connection

Specific Makes:

– A/C Inoperative
– A/C Blows Warm

P053A

Technical Definition:

Positive Crankcase Ventilation Heater Control Circuit / Open

Trouble Code: P053A
Address: 0x053A
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

P0536

Technical Definition:

Air Conditioning (A/C) Evaporator Temperature Sensor Circuit Range / Performance

Trouble Code: P0536
Address: 0x0536
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

A/C Evaporator Temperature Circuit Range/Performance

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty A/C Evaporator Temperature Sensor
– A/C Evaporator Temperature Sensor harness is open or shorted
– A/C Evaporator Temperature Sensor circuit poor electrical connection

Specific Makes:

– A/C Inoperative
– A/C Blows Warm

P0537

Technical Definition:

Air Conditioning (A/C) Evaporator Temperature Sensor Circuit Low

Trouble Code: P0537
Address: 0x0537
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

A/C Evaporator Temperature Circuit Low Input

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty A/C Evaporator Temperature Sensor
– A/C Evaporator Temperature Sensor harness is open or shorted
– A/C Evaporator Temperature Sensor circuit poor electrical connection

Specific Makes:

– A/C Inoperative
– A/C Blows Warm

P0538

Technical Definition:

Air Conditioning (A/C) Evaporator Temperature Sensor Circuit High

Trouble Code: P0538
Address: 0x0538
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

A/C Evaporator Temperature Circuit High Input

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty A/C Evaporator Temperature Sensor
– A/C Evaporator Temperature Sensor harness is open or shorted
– A/C Evaporator Temperature Sensor circuit poor electrical connection

Specific Makes:

– A/C Inoperative
– A/C Blows Warm

P0531

Technical Definition:

Air Conditioning (A/C) Refrigerant Pressure (Sensor A) Circuit Range / Performance

Trouble Code: P0531
Address: 0x0531
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

A/C Refrigerant Pressure Sensor Circuit Range/Performance

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– A/C system low or over charge with refrigerant
– Faulty A/C refrigerant pressure sensor
– Cooling fans in-operative
– A/C refrigerant pressure sensor circuit open or shorted
– A/C refrigerant pressure sensor circuit poor electrical connection

Specific Makes:

– A/C Inoperative
– A/C Blows Warm

P0532

Technical Definition:

Air Conditioning (A/C) Refrigerant Pressure (Sensor A) Circuit Low

Trouble Code: P0532
Address: 0x0532
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

A/C Refrigerant Pressure Sensor Circuit Low Input

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– A/C system low or over charge with refrigerant
– Faulty A/C refrigerant pressure sensor
– Cooling fans in-operative
– A/C refrigerant pressure sensor circuit open or shorted
– A/C refrigerant pressure sensor circuit poor electrical connection

Specific Makes:

– A/C Inoperative
– A/C Blows Warm

P0533

Technical Definition:

Air Conditioning (A/C) Refrigerant Pressure (Sensor A) Circuit High

Trouble Code: P0533
Address: 0x0533
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

A/C Refrigerant Pressure Sensor Circuit High Input

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– A/C system low or over charge with refrigerant
– Faulty A/C refrigerant pressure sensor
– Cooling fans in-operative
– A/C refrigerant pressure sensor circuit open or shorted
– A/C refrigerant pressure sensor circuit poor electrical connection

Specific Makes:

– A/C Inoperative
– A/C Blows Warm

P0534

Technical Definition:

Air Conditioning (A/C) Refrigerant Charge Loss

Trouble Code: P0534
Address: 0x0534
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

Air Conditioner Refrigerant Charge Loss

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– A/C system low or over charge with refrigerant
– Faulty A/C refrigerant pressure sensor
– Cooling fans in-operative
– A/C refrigerant pressure sensor circuit open or shorted
– A/C refrigerant pressure sensor circuit poor electrical connection

Specific Makes:

– A/C Inoperative
– A/C Blows Warm

P0535

Technical Definition:

Air Conditioning (A/C) Evaporator Temperature Sensor Circuit

Trouble Code: P0535
Address: 0x0535
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:

Possible Causes:

Possible Symptoms:

A/C Evaporator Temperature Sensor Circuit

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Evaporator Temperature sensor
– A/C evaporator temperature sensor harness is open or short
– A/C evaporator temperature sensor circuit poor electrical connection

Specific Makes:

– A/C Inoperative
– A/C Blows Warm