Having computer issues with my 05 Suburban


Asked by Nov 03, 2013 at 01:27 PM about the 2005 Chevrolet Suburban LS 1500 4WD

Question type: Maintenance & Repair

I brought my truck to friendly
Chevrolet about 4 weeks ago and
they told me I needed a new ECM
($600). So I decided to go the used
route for $35 and have them reflash
it. Two days later I bring it back
because it's running really rough and
they tell me water keeps getting into
the connections and the seal is bad.
They say you can't buy just the seal
and I have to replace the whole
connector and harness ($1500 parts
and install). They blew it out and put
some dielectric grease in it and sent
me on my way. Two weeks later the
truck won't even start. So I tow it to
main motors and they say the ECM is
bad again. Try another used one and
truck runs now but doesn't like to
idle at stop signs and red lights when
it's in gear but will idle really low in
neutral and park. Obviously it's still
computer related but it's not
throwing check codes. Does anyone
have experience with something like
this or know anyone who knows how
to fix it that isn't a dealership?
Thanks for the help! Can call or text
Brandon at 763-234-682two with any

6 Answers


Hi Brandon, my advice would be get a rebuilt PCM (computer) and have it flashed. Flashing a PCM simply means programming it to your specific vehicle. That's why they use your vehicle identification number to do it. You can buy the rebuilt PCM at just about any auto parts store and have just about any repair facility flash it for you. HTH. -Jim


That may be the problem. I have tried two used PCM's and I'm told that they are still having trouble communicating with the PCM. That is why they are saying the wiring and connector could be bad and should be replaced ($1500)

1 out of 1 people think this is helpful.

I'd be leaning toward the PCM as well. The PCM wiring and connectors are pretty sturdy. Unless the vehicle is pretty old, which it's not, has been in an accident, or you've had trouble with "critters" I'd say it's a safe bet the wiring is good. HTH. -Jim

1 out of 1 people think this is helpful.

I just can't believe that 2 different PCM's would be bad. But they were used so I guess who knows.

1 out of 1 people think this is helpful.

Yeah, used electrical parts scare me. You don't know what they've been through. One other thing that I thought of is check your ground straps and ground wires. The PCM has to have a good solid ground as well. HTH. -Jim


We have a 2005 Chevy Chevrolet Suburban LT, one we were driving home on the highway, out of no where the truck died. On the dash board it said, reduce engine power. All the lights started flickering. Don't no what to do or what it can be.

2 out of 2 people think this is helpful.

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