P2689 Fault Code

Fuel Supply Heater Control Circuit High

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

The P2689 fault code refers to an issue with the fuel supply heater control circuit where the signal is detected as being higher than expected. This may indicate a potential malfunction or short circuit in the sensor or wiring that monitors the heater's operation.

What are the symptoms of the P2689 code?

When the P2689 code is present, you may experience:

• Poor engine performance due to improper fuel temperature.
• Difficulty starting the engine during cold weather.
• Engine stalling or misfiring.
• Check Engine Light illuminated on the dashboard.

What causes the P2689 code?

Common causes of this fault code include:

• A malfunctioning fuel supply heater.
• Shorted or damaged wiring in the control circuit.
• Poor electrical connections or corrosion at connectors.
• Faulty engine control module (ECM) that is unable to correctly interpret the sensor signals.

How to fix P2689?

To resolve the P2689 fault code, consider the following steps:

1. Inspect the wiring and connectors related to the fuel supply heater for any signs of damage or corrosion.
2. Test the fuel supply heater for proper operation using a multimeter.
3. Replace the fuel supply heater if it is found to be defective.
4. Clear the fault code and perform a road test to ensure the issue has been resolved.
5. If the problem persists, further diagnostics of the ECM may be necessary.