Technical Definition:

Control Module Performance

Technical Description:

This code basically means that the programming of the PCM/ECM (powertrain/engine control module) has failed. This can be a more serious code and may also be refered to as “ECM Internal Circuit Malfunction”.

Possible Causes:

• Loose ground terminal on PCM/ECM
• Dead or defective (12V main) battery
• An open or short in the power or ground circuit
• Loose or corroded battery terminals
• Failed PCM/ECM

Possible Symptoms:

• vehicle may also go into “limp-home” mode where it runs under reduced power
• No Start condition (cranks but does not start)
• may stop running while driving

Control Module Performance

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Engine Control Module (ECM)
– Engine Control Module (ECM) Harness power supply circuit is open or shorted
– Engine Control Module (ECM) Programming

Specific Makes:

– Engine may not start