P18B5
Internal Mode Switch 'A' Circuit Shorted
P18B5 is an OBD-II diagnostic trouble code meaning: Internal Mode Switch 'A' Circuit Shorted. Common causes: short circuit in mode switch circuit, malfunction of the internal mode switch. Estimated repair cost: $17–89.
Symptoms
- Incorrect display of gear selector position on the instrument panel
- The car does not start in some selector positions
- The gearbox goes into emergency mode
- Gear shifting problems
- Check Engine light comes on
Causes
- Short circuit in mode switch circuit
- Malfunction of the internal mode switch
- Wiring harness damage
- Problems with the transmission control unit
- Oxidation of contacts
How to Fix
- Check the integrity of the wiring and connections in the switch circuit
- Test the resistance of the mode switch
- Check for short circuit in the circuit
- If necessary, replace the mode switch
- Flash or replace the transmission control unit if necessary
Related codes
FAQ
What does the P18B5 code mean?
P18B5 is an OBD-II diagnostic trouble code that indicates: Internal Mode Switch 'A' Circuit Shorted
What causes a P18B5 error code?
The most common causes of P18B5 include: Short circuit in mode switch circuit; Malfunction of the internal mode switch; Wiring harness damage; Problems with the transmission control unit.
How do I fix a P18B5 diagnostic trouble code?
To fix P18B5: Check the integrity of the wiring and connections in the switch circuit. Test the resistance of the mode switch. Check for short circuit in the circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P18B5?
Limited driving only, diagnose soon
How much does it cost to fix P18B5?
The estimated repair cost for P18B5 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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