P18BC
Internal Mode Switch 'C' Circuit Stuck Off Invalid Voltage Range
P18BC is an OBD-II diagnostic trouble code meaning: Internal Mode Switch 'C' Circuit Stuck Off Invalid Voltage Range. Common causes: internal mode switch 'c' faulty, open or short circuit in switch circuit. Estimated repair cost: $17–89.
Symptoms
- Gear shifting problems
- Incorrect display of the current transmission mode on the instrument panel
- Check Engine light comes on
- The transmission may go into emergency mode
- Difficulty starting the engine in some modes
Causes
- Internal mode switch 'C' faulty
- Open or short circuit in switch circuit
- Wiring Harness Problems
- Transmission control module (TCM) malfunction
- Corrosion of contacts or connectors
How to Fix
- Check the integrity of the mode switch circuit
- Inspect connectors and contacts for corrosion or damage
- Check the operation of the mode switch itself
- Scan the transmission control module for other errors
- If necessary, replace the internal mode switch
Related codes
FAQ
What does the P18BC code mean?
P18BC is an OBD-II diagnostic trouble code that indicates: Internal Mode Switch 'C' Circuit Stuck Off Invalid Voltage Range
What causes a P18BC error code?
The most common causes of P18BC include: Internal mode switch 'C' faulty; Open or short circuit in switch circuit; Wiring Harness Problems; Transmission control module (TCM) malfunction.
How do I fix a P18BC diagnostic trouble code?
To fix P18BC: Check the integrity of the mode switch circuit. Inspect connectors and contacts for corrosion or damage. Check the operation of the mode switch itself. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P18BC?
Limited driving only, diagnose soon
How much does it cost to fix P18BC?
The estimated repair cost for P18BC is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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