P06F9

Symptoms

• Check Engine light on
• Unstable operation or complete failure of GPCM2
• Difficult cold start
• Uneven heating of spark plugs during startup
• Weak battery or charging problems

Causes

• Low or faulty battery
• Faulty generator voltage regulator
• Poor contact in the GPCM2 power circuit
• GPCM2 Circuit Fuse High Resistance
• GPCM2 ground fault

How to Fix

1. Check battery voltage and perform load test
2. Check the voltage at the GPCM2 terminals with the ignition on and when starting the engine.
3. Measure the generator voltage with the engine running (normal 13.8–14.4 V)
4. Check the reliability and cleanliness of the power and ground terminals of GPCM2
5. Check the GPCM2 power supply fuse
6. Eliminate the identified cause of unstable power supply

Related codes

Error P06F9 by Vehicle Brand