OBD-II Generic Error Code P0672: How to Fix It

Q: Can I drive with error code P0672?

You can drive short distances, but expect hard starting in cold weather, reduced fuel economy, and possible misfire. It's best to repair promptly to avoid further issues.

Q: Will a bad glow plug cause a check engine light?

Yes, a malfunctioning glow plug circuit will trigger the check engine light and store code P0672 (or similar).

Q: How much does it cost to fix P0672?

DIY cost: $15-$50 per glow plug. Professional repair: $100-$300 per glow plug including labor, depending on vehicle.

Q: Can a bad glow plug damage the engine?

Yes, prolonged use can cause misfires, unburned fuel in the exhaust, and potential damage to the catalytic converter or DPF.

Q: Do I need to replace all glow plugs at once?

It's recommended to replace all glow plugs if one fails, as others may be near end of life. However, you can replace just the faulty one if the others test good.

Abstract

Error code P0672 indicates that the glow plug in cylinder 2 of your diesel engine has a circuit malfunction. This often causes hard starting in cold weather. The glow plug preheats the combustion chamber; when it fails, the engine may misfire or fail to start.