[SOLVED] P2689 Code: High Voltage Fuel Heater Relay – Quick Fix

The P2689 fault code in automobiles indicates a problem with the fuel supply heater.

The most common symptom is the illumination of the engine light or service engine soon warning light. The cause of this issue could be a faulty fuel supply heater, an open or shorted fuel supply heater harness, or a poor electrical connection in the fuel supply heater circuit.

The repair importance of this issue is high as it can lead to poor engine performance and reduced fuel efficiency. The difficulty level of the repair is moderate, and it takes approximately 1.0 hour to fix.

To fix the issue, one should visually inspect the related wiring harness and connectors and check for damaged components.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level10.0 (Out of 10)

If you notice the Engine Light ON (or Service Engine Soon Warning Light), it could be due to the p2689 fault code. Here are the symptoms to look out for:

  • The P2689 fault code in an automobile can cause several symptoms, including the engine light turning on or the service engine soon warning light appearing.
  • Other symptoms may include a decrease in engine power, reduced fuel efficiency, and rough idling.
  • Additionally, the vehicle may experience stalling or hesitation during acceleration, and there may be a knocking or pinging sound coming from the engine.
  • It is important to address these symptoms promptly to prevent further damage to the vehicle.

The automobile fault code P2689 can be caused by a faulty fuel supply heater, open or shorted harness, or poor electrical connection.

  • The automobile fault code P2689 can be caused by a faulty fuel supply heater.
  • It can also be caused by an open or shorted fuel supply heater harness.
  • Additionally, a poor electrical connection in the fuel supply heater circuit can also trigger this fault code.

To fix the automobile fault code p2689, check the possible causes and inspect related wiring harness and connectors for damage.

  • To fix the automobile fault code p2689, you need to check the possible causes listed above.
  • Visually inspect the related wiring harness and connectors for any damage.
  • Look for broken, bent, pushed out, or corroded connector’s pins.
  • This fix will take an estimated repair time of 1.0 hour.

The fault code is P2689.

The estimated repair time is 1.0 hour. The cost of fixing the fault code is influenced by the repair time.

Most auto repair shops charge between $75 and $150 per hour.

Therefore, the fixing cost of P2689 will be between $75 and $150.

The P2689 code is related to the fuel heater relay control circuit. Ignition voltage is supplied to the coil side of the fuel heater relay whenever the ignition is On.

The Engine Control Module (ECM) provides a ground to control the fuel heater relay.

The voltage of the control circuit should be low when the ECM is commanding the fuel heater On. The voltage of the control circuit should be high when the ECM is commanding the fuel heater Off. The DTC will be set when the ECM detects the fuel heater relay control circuit is shorted to voltage for greater than 1 s.

What are the possible causes of the P2689 automobile fault code?

If you see the engine light on or the service engine soon warning light, it could be due to the P2689 fault code. This code is caused by a faulty fuel supply heater, an open or shorted fuel supply heater harness, or a poor electrical connection in the fuel supply heater circuit. To fix this issue, you should visually inspect the wiring harness and connectors, check for damaged components, and look for broken, bent, pushed out, or corroded connector’s pins.

How can I visually inspect the related wiring harness and connectors to fix the P2689 fault code?

If you’re experiencing the P2689 fault code, start by checking the “Possible Causes” listed above. To visually inspect the related wiring harness and connectors, look for damaged components and check for broken, bent, pushed out, or corroded connector’s pins. This will help you identify any issues with the Fuel Supply Heater harness and circuit poor electrical connection, which could be causing the Engine Light to turn on.

What are the signs of damaged components that I should look for when fixing the P2689 fault code?

If you’re fixing the P2689 fault code, keep an eye out for the engine light or service engine soon warning light turning on. The cause of this issue could be a faulty fuel supply heater, an open or shorted fuel supply heater harness, or a poor electrical connection in the fuel supply heater circuit. To fix the problem, inspect the wiring harness and connectors for any damage, such as broken, bent, pushed out, or corroded pins. Check the possible causes listed above to ensure you don’t miss anything.

p2689 error fault code explained

If your engine light is on, it could be due to a faulty fuel supply heater, an open or shorted harness, or poor electrical connection. Visually inspect the wiring harness and connectors for damage or corrosion.

Check for broken, bent, or pushed out pins.

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