P0683 Code - Glow Plug Module Control To ECM Communication Circuit Fault

What Does P0683 Mean?

This code applies to only diesel engines and indicates that an error has been detected in the glow plug module communication circuit by the PCM or one of the other supporting control modules. These control modules may include (but are not limited to) the transmission control module, the body control module, the antilock brake control module, the instrument panel control module, the turbo control module, the anti-theft module, the cruise control module, the traction control module, proximity alert module, and the climate control module.

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What are the common causes of P0683 ?

• An air leak forward of the DPF will change the sensor readings resulting in the code
• Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
• Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

How do you troubleshoot P0683 ?

The most common repairs for a P0683 code are:
Verifying the code with a scanner and a digital volt/ohm meter, however, an Autohex or Tech II may be necessary for the enormous amount of wiring to test for this repair. A CAN scanner really is the ideal solution here.
Inspect all wiring and connections, replacing or repairing anything that is corroded, damaged, shorted, open or disconnected, including fuses and components. Retesting after any repairs is necessary.
Once you have run a second scan, look at the control module ground circuits and test them for continuity with the battery ground, and be sure no system grounds are disconnected or defective.
Examine the CAN bus system diagram and pin out value chart and test controller connectors. What are the values from the manufacturer? Compare and then repair any circuits.

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