P0056 - HO2S Heater Control Circuit (Bank 1, Sensor 2)

Powertrain DTC Charts and Descriptions 4-13

Diagnostic Trouble Code (DTC) Charts and Descriptions

P0056 - HO2S Heater Control Circuit (Bank 1, Sensor 2)

Description: The PCM controls the heated oxygen sensor bank 1, sensor 2 (HO2S12) heater ON and OFF duty cycle to

maintain a calibrated temperature. This DTC sets when the sensor does not warm up to the required temperature in a calibrated amount of time. This DTC also sets when the PCM is not able to maintain the required temperature after the sensor is warm.

Possible Causes: • VPWR circuit open

• HTR12 circuit open

• HTR12 circuit short

• Incorrect connections

• Damaged or corroded pins

• Exhaust temperature significantly higher than expected

• Damaged HO2S12

Diagnostic Aids: Inspect the connectors for signs of damage, water intrusion or corrosion.

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test DW.

P0059 - HO2S Heater Resistance (Bank 2, Sensor 1)

Description: This DTC sets when the heater current requirements are too low or too high in the UO2SHTR21 circuit.

Possible Causes: • VPWR circuit open

• UO2SHTR21 circuit open

• UO2SHTR21 circuit short

• Damaged universal HO2S21 heater

Diagnostic Aids: Inspect the connectors for signs of damage, water intrusion or corrosion.

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test DZ.

P0060 - HO2S Heater Resistance (Bank 2, Sensor 2)

Description: This DTC sets when the heater current requirements are too low or too high in the HTR22 circuit.

Possible Causes: • VPWR circuit open

• HTR22 circuit open

• HTR22 circuit short

• Damaged HO2S22 heater

Diagnostic Aids: Inspect the connectors for signs of damage, water intrusion or corrosion.

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test DW.

P0068 - Manifold Absolute Pressure (MAP)/Mass Air Flow (MAF) - Throttle Position Correlation

Description: The PCM monitors a vehicle operation rationality check by comparing sensed throttle position to mass airflow

readings. This continuous memory DTC sets when during a key ON, engine running (KOER) self-test, the comparison of the throttle position (TP) sensor and MAF sensor readings are not consistent with the calibrated load values.

Possible Causes: • Air leak at any connection or line of the intake air system components before or after the electronic throttle

body (ETB)

• Leak in the positive crankcase ventilation (PCV) system

• TP sensor not seated correctly

• Damaged MAF sensor

• Damaged TP sensor

Diagnostic Aids: An intake air system leak at a hose, line or connection of any intake air system or PCV system component may

cause this DTC to set. Diagnose any MAF or TP DTCs first. If the throttle plate is closed and the LOAD PID is greater than 55%, or with the throttle plate at wide open throttle (WOT) with the LOAD PID less than 30% indicates a concern is present.

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test DV.

2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015