P067A

Symptoms

• Difficulty starting a diesel engine at low temperatures
• Check Engine Light
• White smoke on cold start
• Unstable engine operation after starting
• The glow plug indicator is on

Causes

• Control wire short circuit to ground
• Broken or damaged control circuit wiring
• GPCM module malfunction
• Faulty glow plug (internal short circuit)
• Oxidation or damage to connectors

How to Fix

1. Read OBD-II codes and capture a freeze frame
2. Inspect the wiring and connectors of the cylinder 4 spark plug and the GPCM
3. Measure the voltage in the cylinder 4 spark plug control circuit
4. Check the resistance of the glow plug (normal: 0.5–2 Ohm)
5. Check the circuit for short circuit to ground
6. If the wiring is working properly, diagnose and replace the GPCM

Related codes

Error P067A by Vehicle Brand