P18C4
Gear Position Sensor Circuit 1 Low Voltage
P18C4 is an OBD-II diagnostic trouble code meaning: Gear Position Sensor Circuit 1 Low Voltage. Common causes: open or short circuit in the sensor circuit, gear position sensor malfunction. Estimated repair cost: $17–56.
Symptoms
- Incorrect gear shifting
- Transmission of the gearbox into emergency mode
- Check Engine Light Illuminates
- Reduced engine performance
- Problems starting the engine
Causes
- Open or short circuit in the sensor circuit
- Gear position sensor malfunction
- Connector problems or contact corrosion
- Malfunction of the transmission control unit
- Problems with power or grounding of the circuit
How to Fix
- Check the integrity of wiring and connectors
- Check the voltage in the sensor circuit
- Replace the gear position sensor if necessary
- Check and, if necessary, replace the transmission control unit
- Clean contacts and eliminate corrosion
Related codes
FAQ
What does the P18C4 code mean?
P18C4 is an OBD-II diagnostic trouble code that indicates: Gear Position Sensor Circuit 1 Low Voltage
What causes a P18C4 error code?
The most common causes of P18C4 include: Open or short circuit in the sensor circuit; Gear position sensor malfunction; Connector problems or contact corrosion; Malfunction of the transmission control unit.
How do I fix a P18C4 diagnostic trouble code?
To fix P18C4: Check the integrity of wiring and connectors. Check the voltage in the sensor circuit. Replace the gear position sensor if necessary. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P18C4?
Yes, but get it checked soon
How much does it cost to fix P18C4?
The estimated repair cost for P18C4 is $17–56. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat