P2633 Fault Code

Fuel Pump B Control Circuit Low

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

The P2633 fault code indicates that there is a problem with the fuel pump B control circuit, specifically that the voltage is low. This can affect the fuel pump's operation, leading to insufficient fuel delivery and engine performance issues. It may trigger the check engine light and result in driveability concerns.

What are the symptoms of the P2633 code?

Drivers may experience a variety of symptoms when the P2633 code is present, including:

• Engine stalling or difficulty starting
• Reduced engine power or acceleration
• Check engine light illumination on the dashboard
• Unusual noises coming from the fuel tank
• Poor fuel economy

What causes the P2633 code?

Common causes for the P2633 code include:

• Faulty fuel pump B or pump motor
• Damaged wiring or connectors in the fuel pump circuit
• Faulty fuel pump relay
• Issues with the vehicle's powertrain control module (PCM)
• A blown fuse related to the fuel pump circuit

How to fix P2633?

To resolve the P2633 code, the following steps should be taken:

1. Inspect the fuel pump B and associated wiring for damage or corrosion.
2. Test the fuel pump relay and replace it if faulty.
3. Check for blown fuses in the fuel pump circuit and replace them as needed.
4. Verify the voltage supply to the fuel pump; repair or replace wiring as needed.
5. If the fuel pump B is defective, replace it to restore proper operation.