P06F7

Glow Plug Control Module 2 Control Circuit Low

Severity

🔴 High

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–333 (est.)

Symptoms

Check Engine light on
No communication with GPCM2 via diagnostic scanner
Glow plugs of the second group do not work
Difficult cold start
The pre-heating lamp lights up abnormally

Causes

Short circuit of the GPCM2 control wire to ground
Damaged insulation in the wiring harness
GPCM2 internal circuit malfunction (short to ground)
Moisture in the wiring harness
Mechanical cable damage

How to Fix

Measure the voltage at the GPCM2 control pin (should change during data exchange)
Disconnect GPCM2 and measure the wire resistance to ground (should be more than 100 kOhm)
If a short circuit is detected, inspect the harness sequentially along the entire route
Eliminate short circuit (repair insulation or replace conductor)
If there is a short inside GPCM2, replace the module
Check the ECU-GPCM2 connection after repair

Related codes

P06F5 P06F6 P06F8 P06FA P0670