Question about 2004 Dodge Ram 1500

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My Snap on scanner will not communicate with my 2004 ram

I was trying to diagnose my 2004 ram's check engine light and was unable to communicate with it using my snap on scannner. The cheap scan tools at Advance auto parts would pull them but with odd codes. I have seen a TSB about a problem with the programming of the ECM's on these and was wondering what the solution is if any. The TSB is # 42 I do believe.

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Posted on Jan 02, 2017


SOURCE: 2003 Caravan No Crank, 3.3L

This is a bad PCM. Try to disconnect the security system first and if it still does not start then it is the PCM.

Posted on Aug 11, 2008

  • 11 Answers

SOURCE: cranks but no spark/start 4.7 v8 G.cherokee


Posted on Sep 27, 2008

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SOURCE: Won't retrieve Scanner Codes.

There should be 12 volts present at terminal 16 of the OBD II diagnostic connector, this is the lower row of terminals, last terminal on the right, this is the same no matter who makes the car on all 1996 OBD II systems, if no voltage is present check your fuse panel, most likely the fuse will be blown for the cigar lighter or the accessory 12 volt power point, not sure what it is called in your Audi. Hope this helps.

Posted on Dec 19, 2008

  • 379 Answers

SOURCE: 2004 1500 Dodge Ram Check engine light on

U0155 definition is lost communication with the ipc control mod , (instrument panel cluster) , reasons include faulty IPC , loose / bad connections at IPC , i read some forums and and some found connection issues at fuse box , when the problem exists you could try wiggling wires at behind fuse box or the back of the IPC try to locate source if indeed it is a connection issue .

good luck.

Posted on Dec 26, 2008

  • 3854 Answers

SOURCE: Check engine light

A multi misfire may mean that one or more of the following has happened:
Faulty spark plug or wires, Faulty coil (pack), Faulty oxygen sensor(s), Faulty fuel injector(s), Stuck/blocked EGR valve / passages, Faulty camshaft position sensor, Defective computer.

The engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wire, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the the problems were faulty fuel injectors. 

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Good luck and hope this information helps, keep me posted, be glad to help you get the truck running 100% again. Not sure if your running a K&N air filter, and if you are there may be a flim of oil on the MAF sensor that is making you run lean. You may want to spray down the MAF sensor with a can of MAF cleaner. 

Posted on Jul 02, 2009

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U0155 definition is lost communication with the ipc control mod , (instrument panel cluster) , reasons include faulty IPC , loose / bad connections at IPC , i read some forums and and some found connection issues at fuse box , when the problem exists you could try wiggling wires at behind fuse box or the back of the IPC try to locate source if indeed it is a connection issue .

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