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This is the code that is causing your issue, You need to check the unswitched power supply from the battery's to the ecm. You could have a loose connection, broken wire, or short. Make sure all is clean and tight. also start the engine and shake the wiring and harness if the engine shuts down you know there is a issue within that area. If the power for the ecm is not at the battery connection then it is at the starter and should be wired direct to the battery. Also check the fuses and fuses holders. There is also a fuse on the right side of the ecm that should be checked. Please don't forget to rate my service.
Fault Code: 434
PID: S251
SPN: 627
FMI: 4
Battery voltage at pin 20, 21, 22, and 23 of actuator harness connector (relative to return pins 9, 25, and 27 of the actuator harness connector) fell below 6.2 VDC for a fraction of a second... OR... electronic control module (ECM) was not allowed to power down correctly (retain the battery supply voltage for 3 seconds) after keyswitch “OFF”.
Possibly no noticeable performance effects or possibility of the engine dying or difficulty in starting the engine.
See pic
Your very welcome. Please don't forget to rate my serice and have a great weekend.
cumminsdr, Mechanic
Category: Medium and Heavy Trucks
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