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

Up Front

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?

Up Front

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.

Up Front

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


No, no flashing lights.

Up Front

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.

Your Answer

Add photo

Related Questions

Ram 2500

Looking for a Used Ram 2500 in your area?

CarGurus has 5,747 nationwide Ram 2500 listings starting at $2,289.


Search Dodge Ram 2500 Questions

Dodge Ram 2500 Experts

#1 Dan Connell
Dan Connell
Reputation 1,910
#2 Ram2500Diesel
Reputation 480
#3 AJBurns
Reputation 420
View All

Related Models For Sale

Used Dodge Ram 3500"
112 Great Deals out of 2,472 listings starting at $4,995
Used Ford F-250 Super Duty"
454 Great Deals out of 42,777 listings starting at $1,000
Used Chevrolet Silverado 2500HD"
391 Great Deals out of 33,676 listings starting at $2,998
Used Dodge Ram 1500"
517 Great Deals out of 13,858 listings starting at $995
Used GMC Sierra 2500HD"
150 Great Deals out of 15,308 listings starting at $1,900
Used Ford F-150"
3,194 Great Deals out of 216,491 listings starting at $1,000
Used Chevrolet Silverado 1500"
2,451 Great Deals out of 144,012 listings starting at $1,995
Used Ford F-350 Super Duty"
451 Great Deals out of 26,783 listings starting at $2,999
Used Toyota Tundra"
617 Great Deals out of 26,462 listings starting at $2,500
Used GMC Sierra 1500"
1,028 Great Deals out of 56,350 listings starting at $2,400

Used Cars For Sale

2007 Dodge Ram 2500 SLT For Sale
7 listings starting at $3,995