P18C9
Gear Position Sensor Gear Ratio Not Plausible
P18C9 is an OBD-II diagnostic trouble code meaning: Gear Position Sensor Gear Ratio Not Plausible. Common causes: gear position sensor malfunction, problems with wiring or connectors. Estimated repair cost: $17–56.
Symptoms
- Incorrect gear shifting
- Delays when shifting gears
- Switching to emergency mode of the gearbox
- Increased fuel consumption
- Check Engine light comes on
Causes
- Gear position sensor malfunction
- Problems with wiring or connectors
- Mechanical problems in the gearbox
- Low transmission fluid level
- Transmission control module (TCM) malfunction
How to Fix
- Check the level and condition of the transmission fluid
- Check the wiring and connectors of the gear position sensor
- Check the gear position sensor for damage
- Conduct transmission diagnostics on a stand
- Replace the gear position sensor if necessary
Related codes
FAQ
What does the P18C9 code mean?
P18C9 is an OBD-II diagnostic trouble code that indicates: Gear Position Sensor Gear Ratio Not Plausible
What causes a P18C9 error code?
The most common causes of P18C9 include: Gear position sensor malfunction; Problems with wiring or connectors; Mechanical problems in the gearbox; Low transmission fluid level.
How do I fix a P18C9 diagnostic trouble code?
To fix P18C9: Check the level and condition of the transmission fluid. Check the wiring and connectors of the gear position sensor. Check the gear position sensor for damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P18C9?
Yes, but get it checked soon
How much does it cost to fix P18C9?
The estimated repair cost for P18C9 is $17–56. Actual cost depends on your vehicle, location, and labor rates.
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