P06FC

Symptoms

• Check Engine light on
• The ECU does not see GPCM2 through the diagnostic scanner
• The second group spark plug system works unpredictably
• Difficult cold start
• Error codes for cylinders of the second group

Causes

• Physical break or short circuit of the LIN/CAN bus between the ECU and GPCM2
• Malfunction of the data bus transceiver in GPCM2 or ECU
• Noise or instability on the data bus
• Incorrect addressing of GPCM2 on the bus
• GPCM2 internal fault

How to Fix

1. Read error codes on the data bus and determine the extent of the problem
2. Check the physical integrity of the LIN/CAN bus from the ECU to GPCM2
3. Measure the voltage on the LIN bus - it should be 12 V in Recessive mode
4. Check the presence of power and grounding of GPCM2
5. Make sure there are no other devices on the bus causing interference
6. If confirmed, replace GPCM2 or repair the bus fault

Related codes

Error P06FC by Vehicle Brand