P050A - Cold Start Idle Air Control Performance

4-76 Powertrain DTC Charts and Descriptions

Diagnostic Trouble Code (DTC) Charts and Descriptions

P050A - Cold Start Idle Air Control Performance (Continued)

All Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.

P050B - Cold Start Ignition Timing Performance

Description: This DTC sets when the difference between desired and commanded spark timing exceeds the calibrated

threshold.

Possible Causes: • Intake air restriction

• Exhaust restriction

• Engine mechanical concern

• Damaged or sludged electronic throttle body (ETB)

• Vacuum leaks

• Damaged PCM

Diagnostic Aids: Disregard the freeze frame data. Freeze frame data does not apply to the cold start monitor.

This DTC is informational only and may be accompanied by other DTCs. Diagnose other DTCs first. If no other DTCs are present, inspect the intake air system for air restrictions, vacuum leaks, and damage. If no concerns are present, clear the DTCs and verify the engine coolant temperature is below 37.8°C (100°F). Allow the vehicle to soak for 2 to 3 hours if necessary for the engine coolant temperature to fall below 37.8°C (100°F). Start the engine without touching the accelerator pedal and allow the engine to idle for 6 minutes in park. If no DTCs are present and the malfunction indicator lamp (MIL) is not illuminated after idling for 6 minutes, carry out the key ON, engine running (KOER), self-test to confirm that no DTCs are present and the repair is complete.

Application Key On Engine Off Key On Engine Running Continuous Memory

All Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.

P050E - Cold Start Engine Exhaust Temperature Out Of Range

Description: The PCM calculates the actual catalyst warm up temperature during a cold start. The PCM then compares the

actual catalyst temperature to the expected catalyst temperature model. The difference between the actual and expected temperatures is a ratio. This DTC sets when this ratio exceeds the calibrated value and the malfunction indicator lamp (MIL) illuminates.

Possible Causes: • Intake air restriction

• Exhaust restriction

• Engine mechanical concern

• Damaged or sludged electronic throttle body (ETB)

• Vacuum leaks

• Damaged PCM

Diagnostic Aids: Disregard the freeze frame data. Freeze frame data does not apply to the cold start monitor.

This DTC is informational only and may be accompanied by other DTCs. Diagnose other DTCs first. If no other DTCs are present, inspect the intake air system for air restrictions, vacuum leaks, and damage. If no concerns are present, clear the DTCs and verify the engine coolant temperature is below 37.8°C (100°F). Allow the vehicle to soak for 2 to 3 hours if necessary for the engine coolant temperature to fall below 37.8°C (100°F). Start the engine without touching the accelerator pedal and allow the engine to idle for 6 minutes in park. If no DTCs are present and the malfunction indicator lamp (MIL) is not illuminated after idling for 6 minutes, carry out the key ON, engine running (KOER), self-test to confirm that no DTCs are present and the repair is complete.

Application Key On Engine Off Key On Engine Running Continuous Memory

All Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.

P0512 - Starter Request Circuit

Description:

Possible Causes:

Diagnostic Aids: Refer to the Workshop Manual Section 303-06, Starting System to continue diagnosis.

Application Key On Engine Off Key On Engine Running Continuous Memory

All Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.

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