AutoCodes – Chevrolet – P18C7 Chevrolet

P18C7 Chevrolet Code - Gear Position Sensor Circuit 2 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: P18C7 Chevrolet indicates Gear Position Sensor Circuit 2 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 1,616

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 P18C7 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 linear position signal 2 circuit for low and high voltage conditions.

OBDII Code P18C7 Chevrolet - Gear Position Sensor Circuit 2 High Voltage - AutoCodes.com — P18C7 Chevrolet Code - Gear Position Sensor Circuit 2 High Voltage

What does this mean?

What are the Possible Causes of the DTC P18C7 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 P18C7 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 P18C7 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 P18C7 Chevrolet Code

1. What are the common symptoms of OBDII code P18C7 (Chevrolet)?

- Common symptoms include issues with gear shifting, harsh shifting, transmission slipping, and the transmission going into limp mode.

2. What does the OBDII code P18C7 (Chevrolet) indicate?

- This code indicates a high voltage condition in the circuit related to the Gear Position Sensor 2 in the transmission.

3. What are the possible causes of OBDII code P18C7 (Chevrolet)?

- Possible causes include a faulty gear position sensor, damaged wiring or connectors in the circuit, or issues with the transmission control module.

4. How can I diagnose the OBDII code P18C7 (Chevrolet)?

- Diagnosing this code typically involves using a scan tool to read the code, checking the transmission sensor's wiring and connectors for damage, and testing the sensor itself for proper functionality.

5. Can driving with OBDII code P18C7 (Chevrolet) cause further damage?

- Continuing to drive with this code present can potentially cause further damage to the transmission due to incorrect gear position readings.

6. How can I repair OBDII code P18C7 (Chevrolet)?

- Repairing this code often involves replacing the faulty gear position sensor, repairing any damaged wiring or connectors, and clearing the code with a scan tool.

7. Is it safe to continue driving with OBDII code P18C7 (Chevrolet) if the vehicle seems to be operating normally?

- It is not recommended to continue driving with this code present, as it can lead to transmission issues and potential safety hazards.

8. Can a DIY enthusiast fix OBDII code P18C7 (Chevrolet) at home?

- Depending on the individual's mechanical skills and access to tools, it may be possible to address this code at home by replacing the gear position sensor and checking the wiring.

9. How much does it typically cost to repair OBDII code P18C7 (Chevrolet) at a mechanic or dealership?

- Repair costs for this code can vary but may range from $200 to $500, including parts and labor, when serviced by a mechanic or dealership.

10. Will resetting the OBDII code P18C7 (Chevrolet) make it go away permanently?

- Resetting the code without addressing the underlying issue will not make it go away permanently; the root cause of the high voltage condition must be diagnosed and fixed.