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P0679 is a diagnostic trouble code (DTC) for "Cylinder 9 Glow Plug Circuit". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The P0679 diagnostic trouble code is an indication that there is an issue with the cylinder 9 glow plug circuit.
Related Trouble Codes:
Diesel engines are difficult to start when it is cold. A glow plug is located in each cylinder to provide heat is necessary to ignite the fuel when the engine is cold. When the Powertrain Control Module (PCM) determines that the engine is cold, it will use the glow plugs to assist in the combustion process. This enables diesel engines to run properly in all types of weather. The P0679 diagnostic trouble code is stored by the Powertrain Control Module (PCM) when the glow plug timer module activates the glow plugs and the cylinder #9 glow plug fails to heat up as it should.
A diagnostic trouble code is normally considered serious when it causes driveability issues or a change in performance. While the P0679 code is stored in the Powertrain Control Module (PCM) the car or truck may be difficult to start, will not start at all, and may cause driveability issues. For this reason the P0679 diagnostic trouble code is considered serious and should be diagnosed and repaired as soon as possible.
During the diagnosis process, glow plug relays are commonly overlooked as the cause of a faulty glow plug. Glow plug wiring and connectors that are damaged and/or corroded are also commonly overlooked. It is important to check all glow plug relays, wiring and connectors before making a determination as to the cause of the P0679 diagnostic trouble code.
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