U0407

Invalid Data Received From Glow Plug Control Module 1

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$33–167 (est.)

Symptoms

Difficulty starting the engine (especially in cold weather)
Check Engine Light Is On
Reduced engine power
Floating idle speed
Possible misfires

Causes

Malfunction of the glow plug control module
Open or short circuit in control circuit
Poor contact in wiring connectors
Contact corrosion
Software error in the ECU

How to Fix

Check the integrity of the wiring and connectors of the glow plug module
Check the supply voltage and module ground
Scan the glow plug module for internal errors
If necessary, replace the glow plug control module
Update ECU software if appropriate service bulletins are available

Related codes

U0408 U0406 U0293