P1689
No Communication Between ECM and Injection Pump Module Data
Severity
🔴 HighCan you drive?
Do not drive — repair immediately
Approx. repair cost
$56–222 (est.)
Symptoms
- Engine won't start
- Unstable engine operation
- Power reduction
- Check Engine Light Is On
- Acceleration problems
Causes
- Open or short circuit in the communication circuit
- Fuel injection pump module malfunction
- Problems with the ECU
- Poor contact in connectors
- Software errors in the ECU
How to Fix
- Check the integrity of the communication circuit between the ECU and the fuel injection pump module
- Inspect connectors for corrosion or damage
- Check the power supply and ground of the fuel injection pump module
- Scan the ECU for errors
- If necessary, replace the injection pump module or ECU