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Engine-Codes – Generic – P2633

P2633 Code - Fuel Transfer Pump Relay Control Circuit Low Voltage

Quick Answer

The diagnostic trouble code P2633 indicates that the fuel transfer pump relay control circuit is experiencing low voltage. Common causes include Faulty fuel transfer pump relay, Corroded or damaged wiring in the relay control circuit, Loose or poor electrical connections. 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
P2633 indicates Fuel Transfer Pump Relay Control Circuit Low Voltage.
Common causes
Common causes include Faulty fuel transfer pump relay, Corroded or damaged wiring in the relay control circuit, Loose or poor electrical connections.
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 14, 2024
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Code P2633 Description

The diagnostic trouble code P2633 indicates that the fuel transfer pump relay control circuit is experiencing low voltage. This code is typically found in vehicles with electronic fuel injection systems. The fuel transfer pump relay is responsible for controlling the fuel pump, which delivers fuel from the tank to the engine. When the voltage in the relay control circuit drops below the specified range, it can lead to issues with fuel delivery, potentially causing the engine to run lean or rich, affecting performance and fuel efficiency.

OBDII Code P2633 - Fuel Transfer Pump Relay Control Circuit Low Voltage
P2633 Code - Fuel Transfer Pump Relay Control Circuit Low Voltage

Common Causes of P2633

  1. Faulty fuel transfer pump relay
  2. Corroded or damaged wiring in the relay control circuit
  3. Loose or poor electrical connections
  4. Issues with the fuel pump itself
  5. Electrical system malfunctions

Symptoms of P2633

  1. Check engine light illuminated on the dashboard
  2. Engine misfires or hesitation during acceleration
  3. Stalling or difficulty starting the engine
  4. Reduced fuel efficiency
  5. Rough idling or uneven engine performance

How to Fix P2633

  1. Begin by diagnosing the issue using a diagnostic scanner to retrieve the trouble code and identify the specific component causing the low voltage in the fuel transfer pump relay control circuit.
  2. Inspect the wiring and connections in the relay control circuit for any signs of damage, corrosion, or loose connections. Repair or replace any faulty wiring or connectors.
  3. Test the fuel transfer pump relay to determine if it is functioning correctly. Replace the relay if it is found to be faulty.
  4. Check the fuel pump for proper operation and replace it if necessary.
  5. Clear the trouble code from the vehicle's computer system and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P2633

The typical repair costs for addressing a fuel transfer pump relay control circuit low voltage issue can range from $150 to $400, including parts and labor. However, the 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 local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.

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Code P2633 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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