Powertrain Codes

P0043

Technical Definition:

Heated Oxygen Sensor (HO2S) Heater Control Circuit Low (Bank 1 – Sensor 3)

Trouble Code: P0043
Address: 0x0043
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
Technical Description:

Possible Causes:

Possible Symptoms:

HO2S Heater Control Circuit Low Bank 1 Sensor 3

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 harness is open shorted
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 circuit poor electrical connection
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 fuse
– Faulty Engine Control Module (ECM)

Specific Makes:

P0044

Technical Definition:

Heated Oxygen Sensor (HO2S) Heater Control Circuit High (Bank 1 – Sensor 3)

Trouble Code: P0044
Address: 0x0044
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
Technical Description:

Possible Causes:

Possible Symptoms:

HO2S Heater Control Circuit High Bank 1 Sensor 3

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 harness is open shorted
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 circuit poor electrical connection
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 fuse
– Faulty Engine Control Module (ECM)

Specific Makes:

P0040

Technical Definition:

Oxygen (O2) Sensor Signals Swapped (Bank 1 – Sensor 1) / (Bank 2 – Sensor 1)

Trouble Code: P0040
Address: 0x0040
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
Technical Description:

Possible Causes:

Possible Symptoms:

O2 Sensor Signals Swapped Bank 1 Sensor 1/Bank 2 Sensor 1

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– HO2S Bank 1 and 2 Sensor 1 harness is open or shorted
– HO2S Bank 1 and 2 Sensor 1 circuit connectors (wrong connection)
– Faulty Engine Control Module (ECM)

Specific Makes:

P0037

Technical Definition:

Heated Oxygen Sensor (HO2S) Heater Control Circuit Low (Bank 1 – Sensor 2)

Trouble Code: P0037
Address: 0x0037
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
Technical Description:

Possible Causes:

Possible Symptoms:

HO2S Heater Control Circuit Low Bank 1 Sensor 2

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 fuse
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 harness is open or shorted
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit poor electrical connection
– Faulty Engine Control Module (ECM)

Specific Makes:

P0038

Technical Definition:

Heated Oxygen Sensor (HO2S) Heater Control Circuit High (Bank 1 – Sensor 2)

Trouble Code: P0038
Address: 0x0038
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
Technical Description:

Possible Causes:

Possible Symptoms:

HO2S Heater Control Circuit High Bank 1 Sensor 2

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 fuse
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 harness is open or shorted
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit poor electrical connection
– Faulty Engine Control Module (ECM)

Specific Makes:

P0039

Technical Definition:

Turbocharger / Supercharger Bypass Valve Control Circuit Range / Performance

Trouble Code: P0039
Address: 0x0039
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
Technical Description:

Possible Causes:

Possible Symptoms:

Turbocharger Bypass Valve Control Circuit Range/Performance

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

P0035

Technical Definition:

Turbocharger / Supercharger Bypass Valve Control Circuit High

Trouble Code: P0035
Address: 0x0035
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
Technical Description:

Possible Causes:

Possible Symptoms:

Turbocharger Bypass Valve Control Circuit High

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

P0036

Technical Definition:

Heated Oxygen Sensor (HO2S) Heater Control Circuit (Bank 1 – Sensor 2)

Trouble Code: P0036
Address: 0x0036
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
Technical Description:

Possible Causes:

Possible Symptoms:

HO2S Heater Control Circuit Bank 1 Sensor 2

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 fuse
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 harness is open or shorted
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit poor electrical connection
– Faulty Engine Control Module (ECM)

Specific Makes:

P0030

Technical Definition:

Heated Oxygen Sensor (HO2S) Heater Control Circuit (Bank 1 – Sensor 1)

Trouble Code: P0030
Address: 0x0030
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
Technical Description:

Possible Causes:

Possible Symptoms:

HO2S Heater Control Circuit Bank 1 Sensor 1

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit open shorted to ground
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit poor electrical connection
– Faulty Engine Control Module (ECM)

Specific Makes:

P0031

Technical Definition:

Heated Oxygen Sensor (HO2S) Heater Control Circuit Low (Bank 1 – Sensor 1)

Trouble Code: P0031
Address: 0x0031
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
Technical Description:

Possible Causes:
  • A short or open in the heater circuit in the sensor
  • A failed O2 sensor heater
  • Wiring/connectors broken/frayed leading to sensor and/or relay
  • Failed PCM/ECM

Possible Symptoms:

HO2S Heater Control Circuit Low Bank 1 Sensor 1

Possible Solutions:
  • check for 12 volts at the heater circuit feed (hint: unplug the sensor and check at the wiring connector to do this measurement)
  • check the ground circuit for continuity
  • measure the resistance of the heater circuit (done on the sensor itself)
  • measure the resistance and voltage of the wiring

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 harness is open shorted to ground
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit poor electrical connection
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse
– Faulty Engine Control Module (ECM)

Specific Makes:

P0032

Technical Definition:

Heated Oxygen Sensor (HO2S) Heater Control Circuit High (Bank 1 – Sensor 1)

Trouble Code: P0032
Address: 0x0032
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
Technical Description:

Possible Causes:
  • A short in the heater circuit in the sensor
  • A failed O2 sensor heater
  • Wiring/connectors broken/frayed leading to sensor and/or relay
  • Failed PCM/ECM

Possible Symptoms:

HO2S Heater Control Circuit High Bank 1 Sensor 1

Possible Solutions:
  • check for 12 volts at the heater circuit feed (hint: unplug the sensor and check at the wiring connector to do this measurement)
  • check the ground circuit for continuity
  • measure the resistance of the heater circuit (done on the sensor itself)
  • measure the resistance and voltage of the wiring

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 harness is open shorted to ground
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit poor electrical connection
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse
– Faulty Engine Control Module (ECM)

Specific Makes:

P0033

Technical Definition:

Turbocharger / Supercharger Bypass Valve Control Circuit

Trouble Code: P0033
Address: 0x0033
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
Technical Description:

Possible Causes:

Possible Symptoms:

Turbocharger Bypass Valve Control Circuit

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

P0034

Technical Definition:

Turbocharger / Supercharger Bypass Valve Control Circuit Low

Trouble Code: P0034
Address: 0x0034
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
Technical Description:

Possible Causes:

Possible Symptoms:

Turbocharger Bypass Valve Control Circuit Low

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes: