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P0383 is a diagnostic trouble code (DTC) for "Glow Plug Control Module Control Circuit Low". 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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The PCM stores the P0383 code when a low voltage reading of the glow plug heater circuit is detected. This will often be accompanied by other glow plug circuit codes.
In order to begin combustion in cold temperatures, the engine requires the heat provided in part by the glow plug system. The temperature and voltage of the glow plugs is monitored by the ECM before and during engine combustion. If the voltage reading detected by the ECM is more than 10% lower than the reading recommended by the manufacturer, the PCM will store the P0383 code.
Faulty glow plugs are most commonly to blame for the P0383 code. However, there could be quite a few other causes, including:
A slow start, and possibly even white smoke from the exhaust when the vehicle does start, may be observed with the P0383 code. The engine may seem far too loud, and the glow plug indicator lamp may stay on constantly. The code will be stored in the PCM, and the Check Engine lamp will illuminate.
After an OBD-II scanner detects the P0383 code, a technician should inspect of all the wiring and electrical components related to the glow plug heater circuit. Any damaged elements should be repaired or replaced. They should then clear the code and perform a test drive, checking that the Check Engine light does not reappear. If the light does reappear, the mechanic should check individual glow plug connectors for the proper voltage and ground signals.
As the mechanic moves through each potential repair to find the issue, they should be sure to clear the code from the PCM and retest the system after each step. This will ensure that the proper repair is performed, and that the issue will not reappear later.
Many technicians report that the glow plug timers and glow plug relays are often replaced when they don’t need to be. Mechanics should be sure to check wiring and commonly at-fault parts before replacing anything, especially because the glow plugs themselves, or the electrical components, are most often to blame.
This issue can cause major issues with the start up and operation of a vehicle, especially in cold climates. If the P0383 code is stored in the PCM, the vehicle should be repaired right away.
There are many ways that a technician can address a P0383 code detection. They include:
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