What Does Code P2635 Mean?
Code P2635 indicates that the engine control module (ECM) has detected a malfunction in the fuel pump control circuit. This means the pump is not operating as expected, which can affect the engine’s fuel supply.
Possible Symptoms:
- Check engine light illuminated on the dashboard
- Engine may have difficulty starting or run irregularly
- Loss of power or possible stalling
Possible Causes:
- Fuel pump failure
- Fuel pump relay defective
- Damaged wiring (cut wires, short circuit, poor connection)
- Loose or corroded connectors
- Fuel pump control module faulty (if present on the vehicle)
How to Fix the Problem?
- Visually inspect the cables and connectors around the fuel pump. Look for cut wires, broken, or oxidized connectors.
- Test the fuel pump relay – this is often a common cause of failure.
- Check the pump itself, especially if the vehicle has difficulty starting or engine cutouts.
- If the vehicle is equipped with one, also check the fuel pump control module.
🔧 Tip: This type of failure can lead to loss of performance or starting problems. It is recommended to have the vehicle diagnosed quickly, especially if symptoms worsen.