P1688
Internal Fuel Injection Pump Controller Failure
P1688 is an OBD-II diagnostic trouble code meaning: Internal Fuel Injection Pump Controller Failure. Common causes: faulty fuel injection pump internal electronics, problems with wiring to the injection pump. Estimated repair cost: $167–556.
Symptoms
- Difficulty starting the engine
- Loss of engine power
- Unstable engine operation
- Increased fuel consumption
- Check Engine Light Is On
Causes
- Faulty fuel injection pump internal electronics
- Problems with wiring to the injection pump
- Faulty injection pump power relay
- Controller grounding problems
- Mechanical damage to fuel injection pump
How to Fix
- Check the integrity of the wiring to the injection pump
- Check the power supply and grounding of the controller
- Test the fuel injection pump power relay
- Carry out fuel injection pump diagnostics on a special stand
- If necessary, replace the injection pump
Related codes
Error P1688 by Vehicle Brand
FAQ
What does the P1688 code mean?
P1688 is an OBD-II diagnostic trouble code that indicates: Internal Fuel Injection Pump Controller Failure
What causes a P1688 error code?
The most common causes of P1688 include: Faulty fuel injection pump internal electronics; Problems with wiring to the injection pump; Faulty injection pump power relay; Controller grounding problems.
How do I fix a P1688 diagnostic trouble code?
To fix P1688: Check the integrity of the wiring to the injection pump. Check the power supply and grounding of the controller. Test the fuel injection pump power relay. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1688?
Do not drive — repair immediately
How much does it cost to fix P1688?
The estimated repair cost for P1688 is $167–556. Actual cost depends on your vehicle, location, and labor rates.
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