AutoCodes – Buick – P18C6 Buick

P18C6 Buick Code - Gear Position Sensor Circuit 2 Low 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: P18C6 Buick indicates Gear Position Sensor Circuit 2 Low 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 1,007

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 P18C6 Buick 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 P18C6 Buick - Gear Position Sensor Circuit 2 Low Voltage - AutoCodes.com — P18C6 Buick Code - Gear Position Sensor Circuit 2 Low Voltage

What does this mean?

What are the Possible Causes of the DTC P18C6 Buick?

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

How to Fix the DTC P18C6 Buick?

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 P18C6 Buick 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.

Need more information about the P18C6 Buick code?

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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 P18C6 Buick Code

1. What are common symptoms of OBDII code P18C6 in a Buick related to the gear position sensor circuit 2 low voltage?

The common symptoms include difficulty shifting gears, incorrect gear display on the dashboard, and potential stalling of the vehicle.

2. What are possible causes of the P18C6 Buick trouble code indicating low voltage in gear position sensor circuit 2?

Potential causes include a faulty gear position sensor, damaged wiring or connectors in the circuit, low battery voltage, or a malfunctioning transmission control module.

3. How can I diagnose the P18C6 code in my Buick related to the gear position sensor circuit 2 low voltage?

Diagnosis typically involves using an OBDII scanner to read the trouble code, inspecting the gear position sensor and related circuitry for damage, and testing the voltage levels in the circuit.

4. What are the repair options for resolving the P18C6 Buick trouble code indicating low voltage in gear position sensor circuit 2?

Repair options may include replacing the gear position sensor, repairing or replacing damaged wiring or connectors, ensuring proper battery voltage, and resetting the trouble code with an OBDII scanner.

5. Can I drive my Buick with the P18C6 OBDII trouble code related to the gear position sensor circuit 2 low voltage?

It is not recommended to drive the vehicle with this code present, as it can lead to further transmission issues and potential safety risks. It is advised to address the issue promptly.

6. How can I prevent the recurrence of the P18C6 trouble code in my Buick after repairs have been made?

To prevent the code from reoccurring, it is important to ensure proper installation of components, maintain regular vehicle maintenance, and address any underlying issues promptly to avoid further damage.

7. Is it possible to reset the P18C6 trouble code in a Buick without making any repairs?

While it is possible to reset the trouble code using an OBDII scanner, it is not recommended to do so without addressing the underlying issue, as it may lead to ongoing problems with the vehicle's transmission.

8. Can a DIY enthusiast repair the P18C6 Buick trouble code related to the gear position sensor circuit 2 low voltage?

Depending on their skill level and access to tools, a DIY enthusiast may be able to diagnose and repair this issue. However, it is recommended to seek professional help if unsure about the repair process.

9. Are there any recalls or technical service bulletins related to the P18C6 code in Buick vehicles?

It is advisable to check with the manufacturer or a Buick dealership for any recalls or technical service bulletins related to the P18C6 trouble code to see if there are known issues or remedies available.

10. How much can I expect to pay for repairs related to the P18C6 OBDII trouble code in a Buick?

Repair costs can vary depending on the specific issue causing the code, labor rates in your area, and whether you choose to repair the vehicle yourself or take it to a professional mechanic. It is recommended to obtain quotes from multiple sources for an accurate estimate.