GM OBD Trouble Code 79
Transmission fluid over temperature
The ECM monitors the automatic transmissionfluid temperature via the transmission fluid temperature sensor. If the transmission fluid reaches a predetermined limit, code 79 will be set.
Fault Code Description
- 79 - Transmission fluid over temperature
Symptoms
- Transmission shifts may become more firm in an attempt to avoid slippage.
Common Problems
- Low transmission fluid level
- Transmission slipping
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