Skip the auto shop - Our mechanics make house calls

Q: Hard start and Code P0672 - Low circuit on cylinder 8 glow plug

asked by on

Low circuit on cylinder 8 glow plug... code P0672... will that be my hard start problem? Icp is good...

My car has 158000 miles.
My car has an automatic transmission.

Hello. Code P0672 is the code for a low circuit on glow plug #2. If you are also having an issue with the cylinder 8 glow plug, then both of these issues, together, could be a potential cause for hard starting. The specific purpose of glow plugs is to warm the engine’s cylinders, in order to help make the engine easier to start. As diesel engines do not have a traditional ignition system and rely entirely on temperature and compression to ignite the fuel mixture, if there is any issue with the plugs, or their circuits, the engine may have trouble starting. I would test the glow plug circuits for cylinders 2 and 8 to see if there is an issue, if not with the plugs themselves, then with the circuits or wiring. If you need an official diagnosis of this, a certified technician from YourMechanic can come to your car’s location to inspect the hard start so that this can be repaired correctly.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: wrench light came on, what does it mean?

Hello. The wrench light Illuminating on your particular vehicle is very similar to a check engine light. When the wrench light comes on the vehicle may go automatically into limp mode. Limp mode is when a vehicle will limit the...

Q: Where is the location of the cabin air filter on a 2002 F-250 P/U, 2-wheel drive, Diesel 7.3?

For some reason Ford used three different evaporator case designs in the trucks this year. The filter will be in one of these three locations. Look behind the glove box and there is a cover on case and filter is...

Q: My car is Renault megane 2003 model manual, my problem is the car stooped it self in the road light & it cant start now.

Hello and thanks for contacting YourMechanic. There are 3 things that could cause the symptoms that you are currently experiencing. One is the ignition coils getting too hot and failing. The second is the trigger to the ignition coils...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.