P18B6
Internal Mode Switch 'B' Circuit Shorted
P18B6 is an OBD-II diagnostic trouble code meaning: Internal Mode Switch 'B' Circuit Shorted. Common causes: short circuit in switch wiring harness, malfunction of the internal mode switch. Estimated repair cost: $17–89.
Symptoms
- Incorrect display of gear selector position on the instrument panel
- Gear shifting problems
- Transmission transition to emergency mode
- Check Engine light comes on
- The car may not start in some selector positions
Causes
- Short circuit in switch wiring harness
- Malfunction of the internal mode switch
- Damage to connectors or corrosion of contacts
- Problems with the transmission control unit
- Mechanical damage to the wiring in the gear selector area
How to Fix
- Conduct a visual inspection of the switch wiring and connectors
- Check the resistance and continuity of the switch circuit
- Test the operation of the internal mode switch
- Check for software updates for the control unit
- If necessary, replace the switch or repair the wiring
Related codes
FAQ
What does the P18B6 code mean?
P18B6 is an OBD-II diagnostic trouble code that indicates: Internal Mode Switch 'B' Circuit Shorted
What causes a P18B6 error code?
The most common causes of P18B6 include: Short circuit in switch wiring harness; Malfunction of the internal mode switch; Damage to connectors or corrosion of contacts; Problems with the transmission control unit.
How do I fix a P18B6 diagnostic trouble code?
To fix P18B6: Conduct a visual inspection of the switch wiring and connectors. Check the resistance and continuity of the switch circuit. Test the operation of the internal mode switch. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P18B6?
Limited driving only, diagnose soon
How much does it cost to fix P18B6?
The estimated repair cost for P18B6 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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