P0141 - O2 Heater Circuit (Bank 1, Sensor 2)

Powertrain DTC Charts and Descriptions 4-31

Diagnostic Trouble Code (DTC) Charts and Descriptions

P0141 - O2 Heater Circuit (Bank 1, Sensor 2) (Continued)

Possible Causes: • HTR12 circuit open

• HTR12 circuit short to voltage

• VPWR circuit open

• GND circuit open

• Low battery voltage

• Water in the harness connector

• Corrosion

• Incorrect connections

• Damaged HO2S12 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.

P0148 - Fuel Delivery Error

Description: At least one bank is lean at wide open throttle (WOT).

Possible Causes: • Severely restricted fuel filter

• Severely restricted fuel supply line

• Damaged or worn fuel pump

• Damaged or contaminated mass airflow (MAF) sensor

Diagnostic Aids:

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test HC.

P014A - Sensor Delayed Response - Rich To Lean (Bank 2, Sensor 2)

Description: During a deceleration fuel shut-off (DFSO) event, the PCM monitors the heated oxygen sensor bank 2, sensor 2

(HO2S22) signal to determine if the signal is stuck in range. The PCM expects the signal to exceed a calibrated rich or lean value within a calibrated amount of time. If the signal voltage remains less than the rich value after a number of occurrences, the PCM intrusively controls the fuel system rich over increasing time periods in an attempt to force the signal to greater than the calibrated rich value. This DTC sets when, after three consecutive intrusive attempts, the signal cannot be forced greater than the calibrated rich value. Also, if the signal voltage remains greater than the lean value after a calibrated amount of time with the fuel injectors off, a counter is incremented. This DTC sets when after three consecutive occurrences the signal is not less than the calibrated lean value.

Possible Causes: • Exhaust leaks before or near the HO2S

• Aftermarket exhaust accessories or performance modifications

• Ethanol content in the fuel

• HO2S22 circuit intermittent

• Damaged HO2S22

Diagnostic Aids: Check for leaks in the exhaust system. Check for an intermittent HO2S22 signal.

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test DW.

P0150 - O2 Circuit (Bank 2, Sensor 1)

Description: This DTC sets when a concern is detected with one of the circuits used to determine the oxygen content in the

exhaust gas.

Possible Causes: • UO2S21 circuit open

• UO2S21 circuit short to ground

• UO2S21 circuit short to voltage

• UO2SGREF21 circuit open

• UO2SGREF21 circuit short to ground

• UO2SGREF21 circuit short to voltage

• UO2SPC21 circuit short to ground

• UO2SPC21 circuit short to voltage

• UO2SPCT21 circuit short to ground

• UO2SPCT21 circuit short to voltage

• Incorrect connections

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