AutoCodes – Chevrolet – P18C5 Chevrolet

P18C5 Chevrolet Code - Gear Position Sensor Circuit 1 High Voltage

Quick Answer

The gear position sensor is a switching transistor mounted to the top of the transmission extension housing. Common causes include Faulty Gear Position Sensor, Gear Position Sensor harness is open or shorted, Gear Position Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P18C5 Chevrolet indicates Gear Position Sensor Circuit 1 High Voltage.
Common causes: Common causes include Faulty Gear Position Sensor, Gear Position Sensor harness is open or shorted, Gear Position Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,295

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Feb 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P18C5 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 P18C5 Chevrolet - Gear Position Sensor Circuit 1 High Voltage - AutoCodes.com — P18C5 Chevrolet Code - Gear Position Sensor Circuit 1 High Voltage

What does this mean?

What are the Possible Causes of the DTC P18C5 Chevrolet?

Faulty Gear Position Sensor
Gear Position Sensor harness is open or shorted
Gear Position Sensor circuit poor electrical connection

How to Fix the DTC P18C5 Chevrolet?

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P18C5 Chevrolet code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P18C5 Chevrolet Code

1. What are common symptoms of OBDII code P18C5 in a Chevrolet related to the Gear Position Sensor Circuit 1 High Voltage?

- Common symptoms include issues shifting gears, rough shifting, and the transmission getting stuck in a particular gear.

2. What can cause the OBDII code P18C5 in a Chevrolet related to the Gear Position Sensor Circuit 1 High Voltage?

- The code P18C5 can be triggered by a faulty gear position sensor, damaged wiring or connectors in the sensor circuit, or a problem with the transmission control module.

3. How can I diagnose the OBDII code P18C5 in a Chevrolet related to the Gear Position Sensor Circuit 1 High Voltage?

- Diagnosis typically involves using a scan tool to read the code, inspecting the gear position sensor and its wiring for damage, and testing the sensor's functionality.

4. Can I drive my Chevrolet with the OBDII code P18C5 related to the Gear Position Sensor Circuit 1 High Voltage?

- It is not recommended to drive your vehicle with this code, as it can lead to potential transmission issues and unsafe driving conditions.

5. How can I repair the OBDII code P18C5 in a Chevrolet related to the Gear Position Sensor Circuit 1 High Voltage?

- Repair options may include replacing the gear position sensor, repairing damaged wiring or connectors, or reprogramming the transmission control module.

6. Is it safe to reset the OBDII code P18C5 in a Chevrolet related to the Gear Position Sensor Circuit 1 High Voltage?

- While you can clear the code temporarily, it is crucial to address the underlying issue causing the code to prevent further transmission problems.

7. What are the possible long-term effects of ignoring the OBDII code P18C5 related to the Gear Position Sensor Circuit 1 High Voltage in a Chevrolet?

- Ignoring this code can lead to more severe transmission issues, potential damage to the transmission system, and increased repair costs in the future.

8. How much does it typically cost to repair the OBDII code P18C5 in a Chevrolet related to the Gear Position Sensor Circuit 1 High Voltage?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $200 to $500 including parts and labor.

9. Can a DIY enthusiast repair the OBDII code P18C5 in a Chevrolet related to the Gear Position Sensor Circuit 1 High Voltage?

- While some may attempt DIY repairs, it is recommended to have a professional diagnose and repair this code due to the complexity of transmission systems.

10. Are there any recalls or technical service bulletins related to the OBDII code P18C5 in a Chevrolet related to the Gear Position Sensor Circuit 1 High Voltage?

- Check with your local Chevrolet dealership or online resources for any recalls or technical service bulletins related to this specific OBDII code to stay informed about potential solutions or updates.