P179B GMC - Range State Command Circuit

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)

P179b Gmc Description

This is an internal fault detection of the Transmission Control Module (TCM). The transmission control module is part of the control solenoid valve assembly, and is not serviced separately. This fault is handled inside the transmission control module and no external circuits are involved.
OBDII Code P179b Gmc - Range State Command Circuit - AutoCodes.com

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P179B GMC Comments

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