P1780
Transmission Control Switch Out of Self-Test Range
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)
Symptoms
- Incorrect display of the current gear on the instrument panel
- Automatic transmission does not change operating modes
- Check Engine Light Is On
- The gearbox goes into emergency mode
- Problems with shifting gears in manual mode (if any)
Causes
- Transmission control switch malfunction
- Open or short circuit in switch circuit
- Poor contact in switch connectors
- Transmission Control Module (TCM) Problems
- Mechanical damage to the gear selector
How to Fix
- Check the condition of the transmission control switch
- Check the integrity of the switch circuit and connectors
- Scan the TCM for additional trouble codes
- If necessary, replace the transmission control switch
- Check and replace the TCM if necessary