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Engine-Codes – Generic – P2508

P2508 Code - ECM/PCM Power Input Signal High

Quick Answer

The P2508 diagnostic trouble code indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected a high voltage input signal from the power supply circuit. Common causes include Faulty ECM/PCM: A malfunctioning ECM/PCM can send incorrect signals to the power supply circuit, causing the high voltage input signal, Wiring Issues: Damaged or corroded wiring connections can disrupt the power input signal, triggering the P2508 code, Poor Connection: Loose or poor connections between the power supply circuit and the ECM/PCM can result in a high voltage input 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
P2508 indicates ECM/PCM Power Input Signal High.
Common causes
Common causes include Faulty ECM/PCM: A malfunctioning ECM/PCM can send incorrect signals to the power supply circuit, causing the high voltage input signal, Wiring Issues: Damaged or corroded wiring connections can disrupt the power input signal, triggering the P2508 code, Poor Connection: Loose or poor connections between the power supply circuit and the ECM/PCM can result in a high voltage input 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 P2508 Description

The P2508 diagnostic trouble code indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected a high voltage input signal from the power supply circuit. This issue can affect the vehicle's performance by causing erratic engine operation, poor fuel efficiency, and potential stalling. The ECM/PCM relies on a steady and stable power input signal to properly control various engine functions, so any abnormalities in this signal can disrupt the vehicle's operation.

OBDII Code P2508 - ECM/PCM Power Input Signal High
P2508 Code - ECM/PCM Power Input Signal High

Common Causes of P2508

  1. Faulty ECM/PCM: A malfunctioning ECM/PCM can send incorrect signals to the power supply circuit, causing the high voltage input signal.
  2. Wiring Issues: Damaged or corroded wiring connections can disrupt the power input signal, triggering the P2508 code.
  3. Poor Connection: Loose or poor connections between the power supply circuit and the ECM/PCM can result in a high voltage input signal.
  4. Short Circuit: A short circuit in the power supply circuit can also lead to the P2508 code.

Symptoms of P2508

  1. Check Engine Light: The most common symptom associated with the P2508 code is the illumination of the Check Engine Light on the vehicle's dashboard.
  2. Erratic Engine Operation: The vehicle may experience rough idling, hesitation, or surging while driving.
  3. Poor Fuel Efficiency: The vehicle may consume more fuel than usual due to the ECM/PCM not being able to properly regulate engine functions.
  4. Stalling: In severe cases, the vehicle may stall unexpectedly while driving, posing a safety risk.

How to Fix P2508

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the fault codes and pinpoint the exact cause of the high voltage input signal.
  2. Inspect Wiring: Thoroughly inspect the wiring connections and harness for any damage or corrosion. Repair or replace as needed.
  3. Check ECM/PCM: Test the ECM/PCM for functionality and replace if necessary.
  4. Repair Connection: Ensure all connections between the power supply circuit and the ECM/PCM are secure and free of corrosion.
  5. Clear Codes: After completing the repairs, clear the fault codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P2508

The cost of repairing the P2508 code can vary depending on the underlying cause and the labor rates at the auto repair shop. Typically, the parts needed for this repair may range from $100 to $500, with labor costs adding an additional $100 to $300. Keep in mind that diagnostic time and labor rates can vary based on location, vehicle make and model, and engine type. It's recommended to consult with a trusted mechanic or shop for a more accurate estimate.

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Code P2508 Information for Specific Makes

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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