2004 Suburban Needs Help. New ECM, swapped instrument cluster, checked wiring.

[tylervet]

Hello,

I have a 2004 Suburban Z71, that runs great, I’ve kept the mx up to date, doing most of it myself. It has many new/repurposed parts. I’d hate for it to have reached the end of its life with 224,000 miles on it.
My instrument cluster displays the check engine, ABS, check 4WD, and the voltage, fuel and temperature gauges work intermittently. The chime will sometimes ding for 10 minutes or longer.
I tried a different instrument cluster, same result. I replaced the ECM, no bueno. New starter switch, battery and alternator. I removed the trailer brake controller, and checked the wiring to the radio. Nothing new was added recently. It seemed to start with a few random glitches, and has slowly gotten worse over the last 5 months. No trouble codes.
What else can I try? Is she done for? It was a good run, we had some good times.

 

[zora]

Have you checked for codes?

 

[tylervet]

No codes. Sometimes a condenser code posts.

 

[zora]

Check engine light and no code?

 

[tylervet]

Check engine, brake light, security/theft light, ABS, and check 4WD. No codes. Why we thought replacing the ECM might help.
Local mechanic spent 10 hours on it. Chevy dealer didn’t want to touch it.
We’ve cleaned out a lot of the connections near the steering wheel.

 

[zora]

Did the mechanic check for any technical service bulletins?

 

[zora]

Did the mechanic check for any technical service bulletins?

It appears instead of hitting reply you created a Report which will be closed

 

[zora]

Try another shop and make sure they have ASE certified mechanics.

 

[tylervet]

Oops. Okay thanks.