P1799
Hold Switch Circuit Malfunction
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)
Symptoms
- Hold function does not work
- Transmission does not shift properly
- Check Engine light comes on
- The car may go into emergency gearbox mode
Causes
- Hold switch malfunction
- Open or short circuit in switch circuit
- Poor contact in wiring connectors
- Transmission control module (TCM) malfunction
- Chain ground problems
How to Fix
- Check the status of the Hold switch
- Check the integrity of the wiring and connectors in the switch circuit
- Check voltage and resistance in the circuit
- Check the operation of the transmission control unit
- If necessary, replace the switch or repair the wiring