P18C2
Internal Mode Switch 'P' Circuit Stuck On Invalid Voltage Range
P18C2 is an OBD-II diagnostic trouble code meaning: Internal Mode Switch 'P' Circuit Stuck On Invalid Voltage Range. Common causes: malfunction of the internal mode switch, open or short circuit in switch circuit. Estimated repair cost: $17–89.
Symptoms
- Inability to start the engine in 'P' position
- Incorrect display of current transmission mode
- Selector lever position indicator flashing
- The Check Engine light comes on
- Problems with switching transmission modes
Causes
- Malfunction of the internal mode switch
- Open or short circuit in switch circuit
- Poor contact in wiring connectors
- Wiring harness damage
- Transmission control module (TCM) malfunction
How to Fix
- Check the integrity of the wiring and connectors of the switch circuit
- Check the voltage at the mode switch
- Test the operation of the internal mode switch
- If necessary, replace the mode switch
- Check and, if necessary, replace the transmission control module
Related codes
FAQ
What does the P18C2 code mean?
P18C2 is an OBD-II diagnostic trouble code that indicates: Internal Mode Switch 'P' Circuit Stuck On Invalid Voltage Range
What causes a P18C2 error code?
The most common causes of P18C2 include: Malfunction of the internal mode switch; Open or short circuit in switch circuit; Poor contact in wiring connectors; Wiring harness damage.
How do I fix a P18C2 diagnostic trouble code?
To fix P18C2: Check the integrity of the wiring and connectors of the switch circuit. Check the voltage at the mode switch. Test the operation of the internal mode switch. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P18C2?
Limited driving only, diagnose soon
How much does it cost to fix P18C2?
The estimated repair cost for P18C2 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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