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P0808 2015 GMC Sierra Code - Clutch Pedal Position Sensor Circuit High Voltage

Quick Answer

The P0808 diagnostic trouble code (DTC) indicates that the Engine Control Module (ECM) has detected a high voltage condition in the clutch pedal position sensor circuit. Common causes include Faulty Clutch Pedal Position Sensor: The sensor itself may be defective or worn out, leading to incorrect voltage readings, Wiring Issues: Damaged, frayed, or corroded wiring in the sensor circuit can cause high voltage signals to be sent to the ECM, Poor Connections: Loose or corroded connectors can disrupt the electrical flow, resulting in erroneous voltage levels. 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 2015 GMC Sierra indicates Clutch Pedal Position Sensor Circuit High Voltage.
Common causes
Common causes include Faulty Clutch Pedal Position Sensor: The sensor itself may be defective or worn out, leading to incorrect voltage readings, Wiring Issues: Damaged, frayed, or corroded wiring in the sensor circuit can cause high voltage signals to be sent to the ECM, Poor Connections: Loose or corroded connectors can disrupt the electrical flow, resulting in erroneous voltage levels.
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 Oct 21, 2024
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Code P0808 2015 GMC Sierra Description

The P0808 diagnostic trouble code (DTC) indicates that the Engine Control Module (ECM) has detected a high voltage condition in the clutch pedal position sensor circuit. The clutch pedal position sensor is a critical component in vehicles equipped with manual transmissions, as it informs the ECM about the position of the clutch pedal. This information is essential for various functions, including controlling engine idle speed, activating the cruise control system, and managing the transmission's shift points.

OBDII Code P0808 2015 GMC Sierra - Clutch Pedal Position Sensor Circuit High Voltage
P0808 2015 GMC Sierra Code - Clutch Pedal Position Sensor Circuit High Voltage

Common Causes of P0808 2015 GMC Sierra

  1. Faulty Clutch Pedal Position Sensor: The sensor itself may be defective or worn out, leading to incorrect voltage readings.
  2. Wiring Issues: Damaged, frayed, or corroded wiring in the sensor circuit can cause high voltage signals to be sent to the ECM.
  3. Poor Connections: Loose or corroded connectors can disrupt the electrical flow, resulting in erroneous voltage levels.
  4. ECM Malfunction: In rare cases, a malfunctioning ECM may misinterpret the signals from the clutch pedal position sensor.
  5. Mechanical Issues: Problems with the clutch assembly or linkage may affect the sensor's operation, leading to incorrect readings.

Symptoms of P0808 2015 GMC Sierra

  1. Erratic Engine Behavior: The engine may stall unexpectedly or exhibit rough idling when the clutch is engaged or disengaged.
  2. Difficulty Shifting Gears: Drivers may experience hard or grinding shifts, particularly when attempting to engage or disengage the clutch.
  3. Cruise Control Malfunction: The cruise control system may become inoperative or behave unpredictably due to incorrect clutch position readings.
  4. Warning Lights: The check engine light (CEL) may illuminate on the dashboard, indicating a fault in the clutch pedal position sensor circuit.
  5. Increased Fuel Consumption: The vehicle may exhibit poor fuel efficiency due to improper engine management resulting from inaccurate sensor readings.

How to Fix P0808 2015 GMC Sierra

  1. Diagnostic Testing: Begin with a thorough diagnostic scan to confirm the P0808 code and check for any additional trouble codes that may provide further insight into the issue.
  2. Visual Inspection: Inspect the wiring harness and connectors associated with the clutch pedal position sensor for any signs of damage, corrosion, or loose connections.
  3. Sensor Replacement: If the sensor is found to be faulty, replace it with a new, OEM-quality part to ensure proper function.
  4. Repair Wiring/Connections: If any wiring or connectors are damaged, repair or replace them to restore proper electrical flow in the circuit.
  5. ECM Reprogramming: After repairs, it may be necessary to clear the trouble codes and reprogram the ECM to ensure it recognizes the new sensor and functions correctly.

Cost to Fix P0808 2015 GMC Sierra

The typical repair costs for addressing a P0808 code can range from $150 to $600, depending on the specific repairs needed. This estimate includes parts and labor. For instance, a new clutch pedal position sensor may cost between $50 and $200, while labor costs can vary significantly based on location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour; however, rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It's advisable to check local rates for a more precise estimate. Additionally, if further diagnostics or repairs are required, costs may increase accordingly.

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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.

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