What is the engine code for a 1999 Dodge Ram?
What is the engine code for a 1999 Dodge Ram? 1999 Dodge RAM 2500 4x4 cummins code p1689. Replaced injection pump and code came back after one day. Checked wiring between ECM and pump. Wiring ok. Replaced fuel relay no change. What can I do? Submitted: 9 years ago. What's the cause of the p1689 error code? Mopar1973Man is back out in his shop and found the cause of P1689 error codes. P1689 - No Communication Between ECM and Injection Pump Module Data link circuit failure between ECM and fuel injection pump. Low power, engine derated, or engine stops. How...