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P0683 is a diagnostic trouble code (DTC) for "Glow Plug Control Module to PCM Communication 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. 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 P0683 code indicates that a diesel powered engine has an issue with the glow plug module communication circuit, which has been detected by the powertrain control module or another control module associated with the PCM.
P0683 is a generic code for glow plug module encountering a communication circuit error, and can be detected by the PCM or the control modules for the transmission, ABS, instrument panel, body, turbo, anti-theft, cruise control, climate control, proximity alert, or traction control modules.
Typically, this code is caused by:
Usually, a P0683 code is preceded by the check engine light, though it can take up to eight cycles before it illuminates. The driver may complain of stalling, poor acceleration, white smoke from the exhaust, and a marked decrease in the vehicle's fuel efficiency.
Diagnosing the P0683 has to begin with the CAN and the use of a Tech II or Authohex may be required for faster and more accurate diagnosis within this complex cluster of wires and harnesses. The memory within the PCM should be saved before beginning to eliminate the need to reprogram after repairs are done.
Using a CAN scanner will show the mechanic the pin values and how the control modules are operating without jeopardizing any of the individual units. The scanner will look at circuitry issues that occur while the vehicle is running. One-by-one tests of each circuit are not possible as there are thousands to test and any one could destroy a module if tested improperly.
The mechanic will also have to look for defective or disconnected system grounds as well as double checking that any transmission or engine grounding cables and wires are secure. All of the control module circuits must be tested for continuity with the battery ground. The mechanic will visually examine the electrical connections, looking specifically for corrosion or lose connections that increase circuit resistance, leading to code storage.
It is helpful to use the CAN bus system wiring diagram or pin out value chart for the vehicle, testing continuity between the individual controller connectors with a digital ohm meter and repairing shorted or open circuits as needed.
Always diagnose codes in the order they have been stored to avoid unsuccessful repairs. Freeze frame data indicates the order that codes were stored, and only after preceding codes are addressed should you move on to the P0683 code.
The P0683 code is one that has a lot of room for misdiagnosis because everything from fuel injector codes and transmission codes to engine misfires and almost any other drivability code can be accompanied by this communication code. Proper diagnosis is important for eliminating the actual cause.
The most common repairs for a P0683 code are:
Replace defective wiring rather than trying to handle it individually in the wiring harnesses.
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