Will not go faster than 15 mph and code P1689

Tiny
DIESELCHICK84
  • MEMBER
  • 2002 DODGE RAM
  • 5.9L
  • 6 CYL
  • TURBO
  • 4WD
  • 205,000 MILES
My truck will not go faster than 15 mph. Reads a p1689. Don't know what's exactly wrong.
Wednesday, May 20th, 2020 AT 1:57 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

I attached the flow chart and possible failure for you for this code. Most of the time it is a bad connection at the ECM.

https://www.2carpros.com/articles/how-to-check-wiring

What kind of scan tool do you have for testing?

Roy

SYMPTOM
P1689-NO COMMUNICATION BETWEEN ECM AND INJECTION PUMP MODULE (OBDII)

WHEN MONITORED
Ignition ON.

SET CONDITION
Time between CAN messages is greater than 3 seconds or Fuel Injection Pump Module does not receive CAN message.

POSSIBLE CAUSES
Wiring and connectors
Fuel injection pump relay output circuit open
Ground circuit open or high resistance
Datalink (+) circuit open
Datalink (+) circuit shorted to ground
Datalink (-) open
Datalink (-) shorted to ground
ECM
Was this
answer
helpful?
Yes
No
Wednesday, May 20th, 2020 AT 3:50 PM

Please login or register to post a reply.

Sponsored links