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Engine-Codes – Generic – P2634

P2634 Code - Fuel Transfer Pump Relay Control Circuit High Voltage

Quick Answer

The P2634 diagnostic trouble code (DTC) refers to a Fuel Transfer Pump Relay Control Circuit High Voltage. Common causes include Faulty fuel transfer pump relay, Wiring issues or shorts in the fuel transfer pump relay control circuit, Corrosion or poor connections in the relay control circuit. 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
P2634 indicates Fuel Transfer Pump Relay Control Circuit High Voltage.
Common causes
Common causes include Faulty fuel transfer pump relay, Wiring issues or shorts in the fuel transfer pump relay control circuit, Corrosion or poor connections in the relay control circuit.
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 12, 2024
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Code P2634 Description

The P2634 diagnostic trouble code (DTC) refers to a Fuel Transfer Pump Relay Control Circuit High Voltage. This code indicates that the powertrain control module (PCM) has detected a high voltage condition in the fuel transfer pump relay control circuit. The fuel transfer pump relay is responsible for controlling the fuel transfer pump, which is essential for transferring fuel from one tank to another in vehicles equipped with dual fuel tanks.

OBDII Code P2634 - Fuel Transfer Pump Relay Control Circuit High Voltage
P2634 Code - Fuel Transfer Pump Relay Control Circuit High Voltage

Common Causes of P2634

  1. Faulty fuel transfer pump relay.
  2. Wiring issues or shorts in the fuel transfer pump relay control circuit.
  3. Corrosion or poor connections in the relay control circuit.
  4. PCM software or hardware issues.
  5. Electrical system malfunctions.

Symptoms of P2634

  1. Engine stalling or hesitation during acceleration.
  2. Difficulty starting the engine, especially when switching between fuel tanks.
  3. Reduced fuel efficiency.
  4. Illumination of the check engine light.
  5. Fuel gauge inaccuracies or fluctuations.

How to Fix P2634

  1. Begin by conducting a thorough inspection of the fuel transfer pump relay and its control circuit to identify any visible damage or loose connections.
  2. Test the fuel transfer pump relay using a multimeter to check for proper functionality.
  3. Inspect the wiring harness for any signs of damage, corrosion, or shorts. Repair or replace any damaged wiring as needed.
  4. Clear the DTC from the PCM memory using a diagnostic scan tool and test drive the vehicle to verify that the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be required to pinpoint the exact cause of the high voltage condition in the fuel transfer pump relay control circuit.

Cost to Fix P2634

The typical repair costs for addressing a P2634 code can vary depending on the specific cause of the issue. In general, the cost of replacing a faulty fuel transfer pump relay can range from $50 to $150, while addressing wiring issues or other electrical malfunctions may increase the total repair cost. Labor rates at auto repair shops typically range from $80 to $150 per hour, so the total cost of repairs can vary based on the location, vehicle make and model, and the complexity of the repair process. It is recommended to consult with a qualified mechanic to obtain a more accurate estimate for addressing this issue.

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Code P2634 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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