P1800 GMC - ECM to TCM Engine Coolant Signal

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Transmission Control Module (TCM)
  • Transmission Control Module (TCM) harness is open or shorted
  • Transmission Control Module (TCM) circuit poor electrical connection

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.
OBDII Code P1800 Gmc - ECM to TCM Engine Coolant Signal - AutoCodes.com

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