ECM to TCM Engine Coolant Signal
Table of contents
P1800 GMC Possible Causes
- Faulty Transmission Control Module (TCM)
- Transmission Control Module (TCM) harness is open or shorted
- Transmission Control Module (TCM) circuit poor electrical connection
How do I fix code P1800 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 P1800 GMC code
The cost of diagnosing the P1800 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.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1800 GMC Description
With the key on, the Powertrain Control Module (PCM) receives a signal that indicated that the power supply to Transmission Control Module (TCM) was interrupted.