I have a 2001 Dodge RAM 1500. I've had the PCM code 0601 for a year or so now. Recently, the truck began not starting occasionally. It would turn over but not start. It was never from a cold start. It was always after I had driven down the road a few miles. If I let it sit for 30 mins to a couple hours, it would start and drive like nothing was ever wrong.

So... after taking the truck to a couple mechanics and having them tell me the PCM needed to be replaced, I decided to give http://www.autocomputerexchange.com/ a shot. I ordered my PCM replacement with my VIN/mileage/part #/etc. I unhooked the negative on the battery, popped off the old PCM, popped on the new, and hooked the battery up.

When I tried to start the truck, it would just turn over. I checked the codes again and now I get 4 new codes:

0505 - Idle Air Ctrl Motor Circs
0117 - ECT Sens Voltage Too Low
0112 - Intake Air Temp Sens Voltage Low
1282 - Accelerator Pedal Pos Sens2 Low Voltage

Does this sound like I got a bad PCM or did the new PCM just reveal more problems?

Thanks!

 

It's possible that the PCM detected more problems.
Or it could be that the PCM is screwing stuff up, or just puking on itself.

How does the truck run?

 

Sounds like you had a short in the wiring somewhere.

 

Prior to changing out the PCM, the truck ran fine (when it started). It would just occasionally (4-5 times in a month?) not start.

After changing the PCM, it will not start at all. The engine turns over but will not start. I think I'm going to swap the PCMs again and see if it will start. I hope by swapping those PCMs, I didn't cause more problems .

 

you may of gotten a bad PCM. that company doesnt have the best rep

 

I went out to swap the old one back in and decided to try it one more time. This time I heard an electrical sound buzz for about 2 seconds in the fuse box when I turned the key to the on position... I guess I just didn't hear it earlier...

I'm gonna have to call these punks and see what's going on...

 

Ok, update:

I've swapped these computers back and forth. Here's what I get now. Both cause the engine to turn over but will not start.

NEW PCM:
- 0505 - Idel Air Ctrl Motor Circs

OLD PCM:
- 0601 - PCM Internal Ctrller Failure

I'm trying to figure out what to do next. Do the symptoms that I described above with the occasional times that it would not start be a symptom of a bad IAC? I'd hate to go buy one and it not really be the problem.

Thanks a lot for the help!

 

rplace the sensors that the new pcm is saying are bad and see what happens

 

Have you tried flooring while starting it?

 

I pumped it once but I didn't keep it floored.

I pulled off the IAC to check it as described on this page: http://www.2carpros.com/articles/how...ol-valve-works

It says to pull it off and leave the wire connected to it. Turn the ignition to the on position. Says the IAC should move in or out if it is working. As far as I can tell, it is not doing anything at all when I do this test.

I'm going to make a few calls in the morning. I may pick up an IAC and try it out. I guess it couldn't hurt. I can return it if it does not help.

If anyone else has input, please chime in. I'm a noob at this stuff but I feel like I have good research skills and can follow directions . Hopefully I get this thing resolved without resorting to a dealer/mechanic.

Thanks!