P067B

Symptoms

• Difficulty starting a diesel engine in cold weather
• Check Engine Light
• White smoke when starting in cold weather
• Unstable engine operation
• The glow plug indicator is on

Causes

• Control wire short circuit to power
• Open ground circuit
• GPCM module malfunction
• Damage to wiring or connectors
• Internal ECU fault

How to Fix

1. Read OBD-II codes and capture data
2. Inspect the wiring and connectors
3. Measure the voltage in the cylinder 4 spark plug control circuit
4. Check the ground circuit for open circuit
5. Check the wire for short to power
6. If the circuit is working properly - GPCM or ECU diagnostics

Related codes

Error P067B by Vehicle Brand