P037D

Glow Plug Sense Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Difficulty starting the engine, especially in cold weather
Increased exhaust smoke
Unstable engine operation at idle
Check Engine Light Illuminates

Causes

Open or short circuit in the glow plug control circuit
Faulty glow plug relay
Poor contact in circuit connectors
Failure of glow plugs
Engine control unit malfunction

How to Fix

Check the resistance of the glow plugs
Check the integrity of the wiring harness and contacts
Check the functionality of the glow plug relay
If necessary, replace faulty components
Reset the error and check if it appears again

Related codes

P0380 P0670 P0671