P1691
Fuel Injection Pump Controller Calibration Error
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)
Symptoms
- Unstable engine operation
- Power reduction
- Increased fuel consumption
- Difficulty starting the engine
- Check Engine Light Is On
Causes
- Fuel injection pump controller malfunction
- Wiring harness damage
- Problems with ECU software
- Corrosion or poor contact in connectors
- Malfunction of the injection pump itself
How to Fix
- Check the condition of the wiring harness and connectors
- Check the functionality of the fuel injection pump controller
- Update ECU software
- Replace the injection pump controller if necessary