P18BD
Internal Mode Switch 'P' Circuit Stuck Off Invalid Voltage Range
P18BD is an OBD-II diagnostic trouble code meaning: Internal Mode Switch 'P' Circuit Stuck Off Invalid Voltage Range. Common causes: malfunction of internal gear position switch, open or short circuit in switch circuit. Estimated repair cost: $17–89.
Symptoms
- Check Engine light comes on
- Glitches in gear recognition (automatic)
- Problems starting the engine
- Transmission does not shift properly
- The position of the selector lever may not be displayed correctly on the instrument panel.
Causes
- Malfunction of internal gear position switch
- Open or short circuit in switch circuit
- Poor contact in connectors or oxidation
- Transmission control module (TCM) malfunction
- Wiring Harness Problems
How to Fix
- Check continuity of position switch 'P'
- Check the condition of connectors and contacts
- Measure the voltage at the switch
- Replace internal gear position switch if necessary
- Check and, if necessary, replace the transmission control module
Related codes
FAQ
What does the P18BD code mean?
P18BD is an OBD-II diagnostic trouble code that indicates: Internal Mode Switch 'P' Circuit Stuck Off Invalid Voltage Range
What causes a P18BD error code?
The most common causes of P18BD include: Malfunction of internal gear position switch; Open or short circuit in switch circuit; Poor contact in connectors or oxidation; Transmission control module (TCM) malfunction.
How do I fix a P18BD diagnostic trouble code?
To fix P18BD: Check continuity of position switch 'P'. Check the condition of connectors and contacts. Measure the voltage at the switch. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P18BD?
Limited driving only, diagnose soon
How much does it cost to fix P18BD?
The estimated repair cost for P18BD is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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