2008 Dodge Ram will not start, replaced the PCM.

Asked by Sep 10, 2016 at 02:02 PM about the 2008 Dodge Ram 2500 SLT

Question type: Maintenance & Repair

It started when first replacing the PCM but was idling high and them the gauges started bouncing.  Now it will not start and the codes are C 61.6, 5 81.4 and then  = 42.3.  Does anyone know what is wrong?

8 Answers

940

Those codes I am not one I am used to reading with my scanner. Most engine codes start with a "P". Most body controller codes start with a "B" and chassis codes start with a "C" I am wondering if with the installation of your new PCM, did you have the unit flashed. If so after that is done. The key then needs to be programmed. If you have had all then done. Then was this the reason you replaced the PCM ?

The PCM was programmed by the VIN and is plug n play. The codes were from the dash after hold the speedometer reset and turning the key to AUX. Do we need to do something with the key?

940

Yes. You need to learn or program your key to your car

Why did the key work when we first started the truck after replacing the PCM? The key has had issues in the past. Everything comes on when the key is in (i.e. AC), so just puzzling.

940

Turn the key on to the run position with out cranking to start. Is the security light flashing ?

No, no flashing lights.

940

I still think that key must be programmed to the sim reader. I use an Autel scanner. You will need to call the dealer ship parts department to get the code to enter into the scanner for the scanner to code the sim to your key. I am almost sure that this needs to be done. As far as it starting a couple of times. That is normal for what you have going on. Now the security system is in lock out and needs to have the key codes to the car

thanks I will give it a try and let you know.

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