P2634 Fault Code

Fuel Pump B Control Circuit High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2634 fault code indicates an issue with the fuel pump B control circuit, where the control circuit is reading higher than expected voltage levels. This can lead to improper operation of the fuel pump, affecting fuel delivery to the engine.

• Understanding the fuel pump circuit is crucial for troubleshooting this code.
• Regular checks on electrical connections can prevent this issue from occurring.
• This code can trigger a check engine light, indicating a fault in the fueling system.

What are the symptoms of the P2634 code?

Drivers may experience several symptoms when dealing with the P2634 fault code:

• Difficulty starting the engine due to lack of fuel pressure.
• Engine stalling, particularly under load.
• Reduced engine performance or a decrease in fuel efficiency.
• The check engine light will be illuminated on the dashboard.
• In some cases, unusual noises from the fuel pump may be noticeable.

What causes the P2634 code?

Common causes for the P2634 code include:

• Short circuits in the fuel pump control circuit.
• Faulty fuel pump causing excessive voltage draw.
• Poor connections or damaged wiring within the circuit.
• Failed fuel pump relay that is improperly supplying voltage.
• Issues related to the engine control module (ECM) affecting the fuel pump operation.

How to fix P2634?

To resolve the P2634 fault code, consider the following steps:

• Inspect the wiring and connectors associated with the fuel pump control circuit for any signs of damage or corrosion.
• Test the fuel pump for proper operation and ensure it's receiving the correct voltage.
• Replace any faulty components, such as the fuel pump itself or the fuel pump relay.
• Clear the diagnostic trouble codes and perform a test drive to see if the issue reoccurs.
• If the problem persists, further diagnostics may be needed to evaluate the engine control module (ECM).