Error code P1689 is displayed and the check engine light is on - what does this mean?
The DTC P1689 is a manufacturer-specific fault code that is recognized by the OBD system and mainly relates to the fuel pump relay circuit. This trouble code mainly occurs in Chrysler, Dodge and Jeep vehicles and indicates a problem with the electrical supply to the fuel pump.
What can cause this fault code?
- Defective fuel pump relay
- Damaged fuel pump fuse
- Broken cable connections in the fuel system
- Corroded or loose plug connections
- Defective fuel pump
- Faulty wiring to the PCM (Powertrain Control Module)
- Damaged engine control unit
- Problems with the vehicle ground
What symptoms occur in parallel with fault code P1689?
- Starting problems: The vehicle is difficult or impossible to start, especially after long periods of inactivity.
- Engine misfires: The engine runs unevenly or stops while driving.
- Loss of power: Noticeable reduction in engine power, especially when accelerating.
- Jerky idling: The engine runs unstable or stalls when idling.
- Smell of fuel: Smell of gasoline in or around the vehicle.
How to fix the problem of fault code P1689?
- Repairing fault code P1689 requires a systematic approach to identify the exact cause.
- Replace the fuel pump relay: Locate the fuel pump relay in the fuse box and replace it with a new, compatible relay
- Check and replace fuses: Check all fuel-related fuses with a multimeter and replace blown fuses
- Repair electrical connections: Inspect all cable connections to the fuel pump, clean corroded contacts and repair damaged cables
- Replace fuel pump: If the pump is faulty, lower the fuel tank, remove the old pump and install a new fuel pump
- PCM diagnosis and replacement: Have the engine control unit diagnosed by a specialist and programmed or replaced if necessary
- Check ground connections: Clean and tighten all fuel system ground connections and replace if corroded
FAQ - Frequently asked questions about DTC P1689
Can I continue driving with error code P1689?
It is not recommended to continue driving with code P1689, as the fuel supply may be impaired. This can lead to sudden engine failure and dangerous situations on the road.
How much does it cost to repair error code P1689?
The repair costs for P1689 vary depending on the cause: a relay costs 15-30€, a new fuel pump 200-500€, while a PCM replacement can cost 800-1500€. The working time is usually 2-6 hours.
Is error code P1689 a serious problem?
Yes, P1689 is a serious problem as it affects the fuel supply to the engine. Without a functioning fuel pump, the vehicle cannot be operated properly.
How can I diagnose fault code P1689 myself?
Use an OBD scanner to confirm the code, then systematically check relays, fuses and cable connections. A multimeter helps with the electrical diagnosis of the fuel pump circuit.
What tools do I need to repair P1689?
Basic tools include an EOBD scanner, multimeter, screwdriver set, pliers and possibly a special fuel line tool. For more complex repairs, a car lift and professional diagnostic equipment are required.
Can bad fuel cause fault code P1689?
Although bad fuel can damage the fuel pump, it does not normally cause P1689 directly. This trouble code refers specifically to electrical problems in the fuel pump relay circuit.