P0683

Glow Plug Control Module 1 to PCM Communication Circuit

Moderate severity

Glow Plug Control Module 1 to PCM Communication Circuit: an electrical fault is present in the circuit. This affects diesel cold-start preheating.

Common causes

Open or short on communication wire
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $90-440
Gateway module routing CAN messages incorrectly
Less common, but worth ruling out after the more likely causes.
low
Typical part cost: $90-440
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First things to check

1Confirm the code with a scan tool and check for additional related codes.
2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Related codes

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Frequently asked questions

What does P0683 mean?

P0683 means "Glow Plug Control Module 1 to PCM Communication Circuit". It is a generic OBD-II code that points to a fault in the computer & auxiliary output controls.

What are the most common causes of P0683?

open or short on communication wire; gateway module routing can messages incorrectly; can terminating resistor (120 ω) drifted out of spec — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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