Glow Plug Module Control Circuit
Table of contents
P0670 GMC Possible Causes
- Faulty Glow Plugs
- Glow Plugs harness is open or shorted
- Glow Plugs circuit poor electrical connection
- Faulty Glow Plug Controller
How do I fix code P0670 GMC?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P0670 GMC code
The cost of diagnosing the P0670 GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
When is the code detected
The Engine Control Module (ECM) has detected a fault on the Glow Plug Control Module (GPCM) control circuit
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of Power
- The engine may be harder to start
- Engine hesitation
P0670 GMC Description
The glow plug controller has the ability to perform internal diagnostics for the voltage and output state of the glow plugs. If the glow plug controller senses an open in the main battery supply to the glow plug controller or a condition with any of the glow plug driver circuits, the glow plug controller will send an error message to the engine control module (ECM). The Diagnostic Trouble Code (DTC) will set when the glow plug controller detects an open to the main battery supply for the glow plugs, or an open in all 8 glow plug circuits for less than 1 second.