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P0683 - GLOW PLUG CONTROL MODULE TO PCM COMMUNICATION CIRCUIT CODE
System: Computer Output Circuits
Unlike a gasoline engine that needs a spark to ignite the fuel,
diesel engines are based on extremely high compression.
Diesel compresses the air inside the cylinders until the air reaches temperatures high enough
for the fuel to ignite easily.
But if a diesel engine block is cold,
it is very difficult to create heat through compression to ignite the fuel.
If the Powertrain Control Module (PCM) detects that the engine is cold
through oil signals and transmission temperature sensors,
it commands the glow plugs to ignite.
Basically diagnostic code P0683 OBDII means that communication between the Glow Plug Control Module (GPCM)
and the Powertrain Control Module (PCM) circuit has been lost.
The fault prevents the PCM from commanding the glow plug control module, this command is important, as it is an on/off signal.
Symptoms of DTC code P0683 Generic
- Illuminated service light.
- Increased fuel consumption.
- Unstable engine idling.
- Deficient acceleration.
- Excessive smoke expelled by the exhaust.
Causes of DTC code P0683 Generic
DTC code P0683 OBD2 is established by the following:
- Open or short circuit in the cables of the Glow Plug Control Module (GPCM).
- Defective ignition.
- Defective connections may occur.
- Error in the glow plug control module.
- Glow plug solenoid may be in bad condition.
- The battery power to the solenoid may be insufficient.
Possible solutions of DTC code P0683 Generic
Before the fault code P0683 OBD II you must do the following for its proper correction:
- Check the cables from the Powertrain Control Module (PCM) to the Glow Plug Control Module (GPCM).
Also, check the solenoid wires on the valve cover.
If any of these electrical components have wear or corrosion, repair or replace.
- Unplug the black and green electrical connector from the GPCM, and check it for defective pins and the presence of corrosion.
- Using a meter in ohms, check the terminals for good grounding. If it is short, repair it.
- Inspect the positive of the battery, as well as the connection to the GPCM in the glow plug solenoid.
Check that all cables are properly adjusted.
- Check the glow plug bus bar.
Make sure the connections on each wire are in good condition.
- Check the glow plug terminal with the ohms meter.
To do this, put one connector on one wire and the other on ground, if the resistance is not between 0.5 to 2.0 ohms, indicates that the spark plug is defective.
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