My 2004 dodge ram 1500 5.7L hemi with automatic transmission is stalling when idling at a stop light, etc. I had had my truck in at the dealership where they performed SB18-013-05 and the problem had been fixed but now it's returned. It presently has 2 active DTC's : P0406 and P0137. I read that there is an EGR replacement covered by emissions warranty and is also accompanied by SB18-010-04. This may be the cause of the P0406 DTC but is this also what is causing the revs to drop and stall?
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check the idle air and throttle for excessive carbon build up or sticking. this can be cleaned with some throttle body cleaner and a little time, most times. some more information would help. is the engine light on? any major service been done or even minor? number of miles? how long has this happened?
On modern day cars the parts that get fitted need to be adapted to the ECM using a decent diagnostic machine. I bet that this was not done and the car is now suffering as a result.
Something to try is resetting the ECU, simply disconnect battery for 10 minutes, reconnect, then start car from cold *without touching gas pedal* and leave idling until the rad fan comes on (this resets all the base idle settings) then take it for a drive - hopefully will solve the problem
I had this same problem in my 04' Hemi I would be driving and as I pulled up to a stop sign or light it would die. No check light or codes. Took it to the dealer they said it was the alternator put a new one in and never had another problem.
Do you know what your AIS motor (automatic idle speed) is on your throttle body.Usually held on with torx screws 2 or 3. Thses are pretty well known for gumming up & sticking. It adjusts your idle automatically under load etc. If your take it off, spray it with throttle body cleaner & be sure to spray some in the port (hole it came out of) before you re-assemble it. Sometimes this will cure it or at least improve it enough that you know your in the right area, if replacement part needed.
It's probably a bad torque converter---that's what allows the engine to idle when transmission is still in gear. It locks when the car is moving, but if it doesnt unlock then the engine will stall out.