OBD-II Generic Error Code P0670: How to Fix It - Glow Plug Control Module

Q: Can I drive with a P0670 code?

You may notice hard starting, especially in cold weather. Continuing to drive can damage the glow plug system or battery if repeatedly failing to start. It's best to diagnose and repair promptly.

Q: Will a bad glow plug control module cause check engine light to come on?

Yes, P0670 specifically indicates a fault in the glow plug control module circuit. The check engine light (or glow plug light) will illuminate.

Q: How much does it cost to fix P0670?

DIY costs range from $20-50 for glow plugs and a relay to $100-200 for a control module. Professional repair typically runs $300-600 including labor and parts.

Q: Is code P0670 the same for all vehicles?

Yes, P0670 is a generic OBD-II code meaning glow plug control module circuit malfunction. However, repair steps may vary slightly by make and model.

Q: Can a bad glow plug cause P0670?

Yes, a shorted or open glow plug can sometimes trigger the module code. Always test individual glow plugs first.

Abstract

Error code P0670 indicates a problem with the glow plug control module in diesel vehicles. This module manages the glow plugs that heat the engine's cylinders for cold starts. While you can check wiring and fuses yourself, replacement may require professional help.