Jeep DTC P1690 – Fuel injection pump CKP Sensor Does Not Agree With ECM CKP Sensor
DTC P1690 meaning on Jeep
DTC P1690 on a Jeep indicates that the Fuel Injection Pump Controller (FIPC) has detected a discrepancy between the signals from the Crankshaft Position (CKP) sensor in the fuel injection pump and the CKP sensor in the Engine Control Module (ECM).
Jeep DTC P1690 symptoms
Symptoms of DTC P1690 on a Jeep may include:
- Engine misfires or runs rough
- Loss of power
- Difficulty starting the engine
- Check Engine Light (CEL) illuminated
Jeep DTC P1690 causes
Common causes of DTC P1690 on a Jeep include:
- Faulty CKP sensor in the fuel injection pump
- Faulty CKP sensor in the ECM
- Wiring or connection issues between sensors and ECM
- Defective FIPC
Jeep DTC P1690 seriousness
DTC P1690 on a Jeep should be addressed promptly as it can lead to drivability issues and potential engine damage if left unresolved.
How to diagnose DTC P1690 on Jeep
To diagnose DTC P1690 on a Jeep, follow these steps:
- Use a scan tool to retrieve the fault codes and freeze frame data
- Inspect the CKP sensors and their wiring for any visible damage or corrosion
- Perform a CKP sensor resistance test
- Check the FIPC for proper operation
How to fix DTC P1690 on Jeep
To fix DTC P1690 on a Jeep, consider the following:
- Replace the faulty CKP sensor(s) in the fuel injection pump or ECM
- Repair any damaged wiring or connections
- If the FIPC is defective, replace it with a new unit
- Clear the fault codes and test drive the vehicle to ensure the issue is resolved
How to erase DTC P1690 on Jeep
To erase DTC P1690 on a Jeep:
- Use a scan tool to clear the fault codes
- If the issue has been fixed, the Check Engine Light should turn off
- Perform a final test drive to confirm the repair
Recommended tools for Jeep diagnostics
Explore our expert picks: The Best OBD2 Scanners for 2025
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.