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P0675 OBD-II Trouble Code: Cylinder 5 Glow Plug Circuit

Check Engine Light

P0675 code definition

A P0675 trouble code indicates that the Powertrain Control Module (PCM) has reported an issue in engine cylinder 5's glow plug circuit.

What the P0675 code means

A glow plug helps the vehicle's engine to start by heating itself and the surrounding area. A P0675 code will be registered by the PCM if there's a discrepancy of more than 10% between the cylinder 5 glow plug voltage and the default level set by the manufacturer.

What causes the P0675 code?

  • In the vast majority of cases, a P0675 code is caused by a problem directly related to the glow plug itself. The cylinder 5 glow plug may be damaged or faulty. The glow plug's module, relay and/or timer may specifically be at fault.

  • Blown fuses are a common occurrence with the P0675.

  • In very rare circumstances, the P0675 code may be the result of a faulty PCM. However, this should only be considered once all of the likelier possibilities have been exhausted.

What are the symptoms of the P0675 code?

The consequences of a P0675 code generally pertain to starting the engine itself. The engine may take longer to start or misfire. Louder engine noise is also typically reported upon startup. The symptoms of a P0675 may be worse if you're operating the car in particularly cold weather or climate. In addition to the practical symptoms, the P0675 trouble code and illuminated dashboard trouble lamp will be present in order to help the operator or technician pinpoint the root cause more easily.

How does a mechanic diagnose the P0675 code?

A P0675 code may be identified first by scanning the vehicle's onboard computer with an OBD-II code reader. Check in and around engine cylinder 5 for any signs of damage or abnormality. Inspect the glow plug itself thoroughly, with particular focus being given to the relay, timer and module components. A glow plug can be tested by removing it from the cylinder and linking it up to independent battery voltage to see how quickly it heats. Any system-related wiring should be inspected as well. Disconnected, damaged or otherwise faulty wiring related to the cylinder 5 glow plug can result in a P0675 code as well.

Common mistakes when diagnosing the P0675 code

Although glow plugs themselves are often the cause, they are sometimes mistakenly replaced by overlooking electrical circuit issues. Bad or disconnected wiring can result in the same issues. Electrical wiring should be inspected before investing in any new components.

How serious is the P0675 code?

The malfunction of one glow plug shouldn't disable the engine, but it will increase wear on other components, especially if the vehicle is being used in bad weather or a cold climate. If there are significant issues with starting the engine, the P0675 should be addressed by a mechanic as soon as possible.

What repairs can fix the P0675 code?

  • Any components relating to the glow plug should be repaired or pre-placed if they've been found out as faulty.

  • Any electrical wiring and circuitry in and around cylinder 5 or relating to the cylinder 5 glow plug should be repaired as needed.

  • Replace any blown fuses and retest the glow plug periodically to see if it lights up. If fresh fuses keep blowing, look to the electrical circuitry for problems.

  • Following the repairs, the vehicle should be test driven. This will allow you to see whether the trouble code has been solved or not.

  • Reread the computer with an OBD-II scanner afterwards to see if the code has returned.

Additional comments for consideration regarding the P0675 code

The P0675 code is often reported alongside other glow plug-related codes. In the case that multiple glow plug issues have stemmed from a common source, trouble codes should be addressed in the order in which they've been reported. Care should be taken when testing the glow plug. Glow plugs go orange with heat within seconds of being linked up to voltage and should be handled with caution.

Need help with a P0675 code?

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The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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