AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Chevrolet - P18C4 Chevrolet

P18C4 Chevrolet Code - Gear Position Sensor Circuit 1 Low Voltage

- Code Popularity: 1,156 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

What are the Possible Causes of the DTC P18C4 Chevrolet?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Gear Position Sensor
  • Gear Position Sensor harness is open or shorted
  • Gear Position Sensor circuit poor electrical connection
⚠ Does your Chevrolet have Safety Recalls? → Check here

How to Fix the DTC P18C4 Chevrolet?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Search for P18C4 Chevrolet Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P18C4 Chevrolet code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P18C4 Chevrolet Description

The gear position sensor is a switching transistor mounted to the top of the transmission extension housing. The four wire sensor interfaces directly with the Engine Control Module (ECM). The ECM supplies 5 V to the gear position sensor on a 5 V reference circuit and also provides a ground path on a low reference circuit. The sensor provides a Pulse Width Modulated (PWM) duty cycle to the ECM on two signal circuits that is proportional to the linear and radial position of the corresponding magnet assembly mounted to the shift shaft. The vehicle uses the gear position sensor information primarily for Active Rev Matching and Active Fuel Management. The ECM monitors the radial position signal 1 circuit for low and high voltage conditions.

OBDII Code P18C4 Chevrolet - Gear Position Sensor Circuit 1 Low Voltage - AutoCodes.com
P18C4 Chevrolet Code - Gear Position Sensor Circuit 1 Low Voltage

Need More Information on the Code?

Need more information on how to fix the P18C4 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P18C4 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Code P18C4 Chevrolet comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P18C4 Chevrolet code? Have you replaced any parts?
Any information is appreciated. Thanks