P1824
Internal Mode Switch 'P' Circuit Low Voltage
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–67 (est.)
Symptoms
- Car won't start in 'P' position
- Incorrect display of selector position on the instrument panel
- Gear shifting problems
- Check Engine Light Is On
- Activating the emergency transmission mode
Causes
- Open or short circuit in the mode switch circuit
- Malfunction of the internal mode switch
- Connector problems or contact corrosion
- Transmission control module (TCM) malfunction
- Poor circuit grounding
How to Fix
- Check the integrity of the wiring and connectors in the switch circuit
- Check the voltage at the mode switch
- Test the operation of the internal mode switch
- Check connections to transmission control unit
- If necessary, replace the mode switch or repair the wiring