Engine Error
P0674
Cylinder 4 Glow Plug Circuit
Severity
Low
Symptoms
Noticeable diesel knock on cold start, MIL illuminated
Common Causes
- Defective cylinder 4 glow plug
- Wiring harness shorted to engine block
- Failed control module
- Damaged electrical connector
How to Fix
- 1 Replace glow plug
- 2 Inspect and repair wiring harness
- 3 Test module output voltage
- 4 Replace connector boot
Estimated Repair Cost
USD
$80
–
$300
Glow plug: $80 - $200