P0671

Symptoms

• Difficulty starting a diesel engine at low temperatures
• The Check Engine light comes on
• White smoke from the exhaust pipe during cold start
• Unstable engine operation after a cold start
• The glow plug icon is lit on the dashboard

Causes

• Burnt out or worn glow plug for cylinder 1
• Broken glow plug lead wire
• Oxidation or poor contact in the spark plug connector
• Relay or GPCM faulty
• Damage to the wiring from the GPCM to the glow plug

How to Fix

1. Read error codes with OBD-II scanner
2. Measure the resistance of the glow plug of cylinder 1 with a multimeter (norm: 0.5–2 Ohm; break - infinity)
3. Visually inspect the wiring and glow plug connector for cylinder 1
4. Check the voltage at the spark plug contact when the ignition is turned on.
5. Replace the glow plug of cylinder 1 if its malfunction is confirmed.
6. Check and if necessary replace the GPCM

Related codes

Error P0671 by Vehicle Brand