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Engine-Codes – GMC – P0808 GMC

P0808 GMC Code - Clutch Pedal Position Sensor Circuit High Voltage

Quick Answer

The P0808 GMC code indicates a problem with the clutch pedal position sensor circuit, specifically high voltage. Common causes include Faulty clutch pedal position sensor, Damaged sensor wiring harness, ECM receiving incorrect signal. 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
P0808 GMC indicates Clutch Pedal Position Sensor Circuit High Voltage.
Common causes
Common causes include Faulty clutch pedal position sensor, Damaged sensor wiring harness, ECM receiving incorrect signal.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P0808 GMC Description

The P0808 GMC code indicates a problem with the clutch pedal position sensor circuit, specifically high voltage. This sensor is responsible for detecting the position of the clutch pedal and sending this information to the engine control module (ECM) to adjust various engine parameters accordingly. When the sensor circuit registers a high voltage, it means that the signal being sent is outside of the normal operating range, which can lead to issues with the vehicle's performance.

OBDII Code P0808 GMC - Clutch Pedal Position Sensor Circuit High Voltage
P0808 GMC Code - Clutch Pedal Position Sensor Circuit High Voltage

Common Causes of P0808 GMC

  1. Faulty clutch pedal position sensor
  2. Damaged sensor wiring harness
  3. ECM receiving incorrect signal
  4. Corrosion or loose connections in the sensor circuit
  5. Electrical issues within the vehicle's system

Symptoms of P0808 GMC

  1. Difficulty shifting gears
  2. Rough idling
  3. Decreased fuel efficiency
  4. Stalling
  5. Check engine light illuminated

How to Fix P0808 GMC

  1. Begin by diagnosing the specific cause of the high voltage in the clutch pedal position sensor circuit using a diagnostic scanner.
  2. Inspect the sensor wiring harness for any damage, corrosion, or loose connections, and repair or replace as necessary.
  3. Test the clutch pedal position sensor itself to determine if it is functioning correctly; replace the sensor if it is found to be faulty.
  4. Clear the diagnostic trouble codes from the ECM and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further inspection of the ECM and related components may be necessary.

Cost to Fix P0808 GMC

The typical repair costs for addressing a P0808 GMC code can range from $150 to $400, including parts and labor. However, specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check with local shops for a more accurate estimate of repair costs.

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Information for Specific GMC Models

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 P0808 GMC Code

1. What does the OBDII code P0808 mean for a GMC vehicle?

P0808 indicates a high voltage issue in the clutch pedal position sensor circuit, which monitors the position of the clutch pedal for proper vehicle operation.

2. What are the common symptoms of a P0808 code in GMC vehicles?

Symptoms may include difficulty starting the vehicle, poor transmission performance, or the Check Engine Light being illuminated.

3. What causes the P0808 code on a GMC?

Common causes include a faulty clutch pedal position sensor, damaged wiring or connectors, or issues with the vehicle's PCM.

4. Can a P0808 code affect vehicle performance?

Yes, it can lead to problems with starting the engine or shifting gears, especially in manual transmission vehicles.

5. How do I diagnose the P0808 code on a GMC?

Inspect the clutch pedal position sensor, check for damaged wires or connectors, and use a scan tool to monitor sensor voltage readings.

6. What tools are needed to fix the P0808 code?

A diagnostic scan tool, multimeter, and basic hand tools are typically required for troubleshooting and repair.

7. Is it safe to drive with the P0808 code active?

Driving may be possible, but issues like starting difficulty or gear shifting problems could worsen, so repairs should be prioritized.

8. How do you fix a P0808 code on a GMC vehicle?

Repairs may include replacing the clutch pedal position sensor, repairing wiring, or updating/reprogramming the PCM.

9. Can the P0808 code trigger other transmission-related issues?

Yes, it can indirectly affect gear selection and overall transmission functionality if not resolved.

10. How much does it cost to repair a P0808 code on a GMC?

Costs depend on the specific issue but typically range from $100 to $300 for sensor replacement and labor.

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