AutoCodes – Cadillac – P18C6 Cadillac

P18C6 Cadillac 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 Cadillac 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 846

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

What does this mean?

What are the Possible Causes of the DTC P18C6 Cadillac?

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 Cadillac?

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 Cadillac 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 P18C6 Cadillac Code

1. What are the common symptoms of OBDII code P18C6 in a Cadillac related to the Gear Position Sensor Circuit 2 Low Voltage?

- Common symptoms include rough shifting, inability to shift gears, and the transmission getting stuck in one gear.

2. What are the possible causes of the Gear Position Sensor Circuit 2 Low Voltage code in a Cadillac?

- Possible causes include a faulty gear position sensor, damaged wiring or connectors in the circuit, low transmission fluid levels, or a malfunctioning transmission control module.

3. How can I diagnose the Gear Position Sensor Circuit 2 Low Voltage issue in my Cadillac?

- To diagnose this issue, you can use an OBDII scanner to retrieve the specific code, inspect the gear position sensor and its wiring for damage, and check the transmission fluid level.

4. Can I continue driving my Cadillac with the P18C6 code related to the Gear Position Sensor Circuit 2 Low Voltage?

- It is not recommended to continue driving with this code, as it can lead to further transmission damage and safety risks. It's best to address the issue promptly.

5. What are some repair tips for fixing the Gear Position Sensor Circuit 2 Low Voltage problem in a Cadillac?

- Repair tips may include replacing the faulty gear position sensor, repairing or replacing damaged wiring or connectors, ensuring proper transmission fluid levels, and resetting the transmission control module.

6. Will resetting the OBDII code P18C6 related to the Gear Position Sensor Circuit 2 Low Voltage make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear. It is essential to diagnose and fix the root cause.

7. How much does it typically cost to repair the Gear Position Sensor Circuit 2 Low Voltage issue in a Cadillac?

- The cost of repair can vary depending on the specific cause of the problem, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can a DIY enthusiast fix the Gear Position Sensor Circuit 2 Low Voltage problem in a Cadillac?

- Depending on the level of expertise and access to tools, a DIY enthusiast may be able to address simple causes like damaged wiring or connectors. However, more complex issues may require professional diagnosis and repair.

9. What are the long-term consequences of ignoring the P18C6 code related to the Gear Position Sensor Circuit 2 Low Voltage in a Cadillac?

- Ignoring this code can lead to further transmission damage, potential safety hazards while driving, and higher repair costs in the future. It's crucial to address the issue promptly.

10. How can I prevent the Gear Position Sensor Circuit 2 Low Voltage code from reoccurring in my Cadillac?

- Regular maintenance, such as checking transmission fluid levels, inspecting wiring for damage, and addressing any warning lights promptly, can help prevent the recurrence of this code.