Jeep DTC P1689 – No Communication Between ECM & Injection Pump Module
DTC P1689 meaning on Jeep
DTC P1689 on a Jeep indicates a communication error between the Engine Control Module (ECM) and the Injection Pump Module. This code is specific to diesel engines and can lead to drivability issues if not addressed promptly.
Jeep DTC P1689 symptoms
- Check Engine Light (CEL) illuminated
- Engine may go into limp mode
- Loss of power or acceleration
- Hard starting or no start condition
Jeep DTC P1689 causes
- Faulty ECM or Injection Pump Module
- Wiring or connection issues between ECM and Injection Pump Module
- Corrosion or poor electrical connections
- Software issues
Jeep DTC P1689 seriousness
The DTC P1689 code should be taken seriously as it can lead to drivability issues and potential engine damage if left unresolved. It is recommended to address this code promptly to prevent further complications.
How to diagnose DTC P1689 on Jeep
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the wiring and connectors between the ECM and Injection Pump Module for any damage or corrosion
- Check for proper power and ground to both modules
- Perform a communication test using a scan tool to verify connectivity
How to fix DTC P1689 on Jeep
- Repair any damaged wiring or connectors
- Ensure proper power and ground connections to both modules
- If necessary, replace the faulty ECM or Injection Pump Module
- Clear the fault codes and perform a test drive to verify the repair
How to erase DTC P1689 on Jeep
- Use a diagnostic scanner to clear the fault codes
- Disconnect the battery for a few minutes to reset the ECM
- After clearing the codes, perform a test drive to ensure the code does not return
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.