DTC 79 - P1714

Name of Code:
P-1714(79) Low Battery Voltage

When Monitored: Continuously with engine running and Transmission Relay energized.

Set Condition: If the voltage sensed at the Transmission Control Relay Output circuit (pins 16 and 17 at TCM) for 15 seconds.

Theory of Operation: The Transmission system requires sufficient battery voltage in order to energize the transmission solenoids. The TCM continuously monitors the voltage available to the solenoids.

Transmission Effects: At speeds above 45 MPH the transmission system will default to neutral. Below 45 MPH the transmission system will default to relay open limp-in mode. Park, Reverse, and Neutral are still available.

Possible Causes:
- Charging system problem
- Poor/High resistance connection between TCM and Battery/Alternator
- TCM pin 16 and 17 high resistance or poor connection
- TCM ground pins 53 and 57 high resistance or poor connection
- High resistance in Transmission Control Relay contacts
- TCM