Code 42

[SCOOBY DOO]

Swap in a known good ECM and report back.

 

[hensleyt]

I believe it a wiring harness problem you said you have some pin problems.

 

[hensleyt]

Took some offline advice and changed the crank sensor.

save that part the only relationship it has to your problem is its 2 feet from the ignition module

 

[That GN Guy]

Rebuilt Delco pcm from rock auto is in, problem solved!

No idea how that was possible, never hit bad pcm on the tree with any parts. But hey, now I have a few "known working" parts laying around

I let it run for 10 minutes or so with no codes, we'll see how it runs when I have the time to take it out for a spin.

Thanks for the help everyone, this forum is great.

 

[turbojay]

Rebuilt Delco pcm from rock auto is in, problem solved!

No idea how that was possible, never hit bad pcm on the tree with any parts. But hey, now I have a few "known working" parts laying around

I let it run for 10 minutes or so with no codes, we'll see how it runs when I have the time to take it out for a spin.

Thanks for the help everyone, this forum is great.

Make sure to take it for a long drive. The pcm in mine always failed after the car was driven 20-30 miles. Hopefully your issue has been resolved.

 

[That GN Guy]

Took it for a drive tonight, maybe 30 or 40 minutes. Didn't get a CEL and the car ran great.

 

[MONSTER GN]

Good thread, giving it a bump so I can return to it later after running through the flowchart. MAL Code 42 constantly illuminated, loss of power, and returns immediately even when battery disconnected, will advise my findings if I ever get any free time to poke around at it.

 

[MONSTER GN]

Well this is as far as I got and boy did I make this thing mad when clearing the codes,no other codes present, seemed to have misplaced my turbo tweak code list sheet, but now it appears alternator not charging and my knock is through the roof

 

[MONSTER GN]

Well this is as far as I got and boy did I make this thing mad when clearing the codes,no other codes present, seemed to have misplaced my turbo tweak code list sheet, but now it appears alternator not charging and my knock is through the roof

Update, alternator figured itself out, we're good there, but still displays excessive retard degrees even tho functioning knock gauge shows nothing, any ideas where to start now? Also after reaching "yes" I cleared code again, this is probably no the proper procedure? If incorrect and after I get code to set, I then get to move to yes since code 42 is still displayed on scan master and brick scanner.

 

[MONSTER GN]

Update, I wasn't getting anywhere with the flow chart, and as I was test driving the vehicle just totally freaked out, misfiring, popping etc, barely got it home. I shotgunned an ECM MAL Code 42 gone, new ECM had MAL Code 24, adjusted TPS, no more MAL codes. Here's where it gets funny, I set my parameters for the turbo tweak chip but my knock on scan master was showing 19-20-21 etc at idle, scan tool showed no knock and my ATS reading was just blinking, so on a hunch I reached behind the data link connecter and squeezed the harness, scan master shut off, lost power to scan tool, wiggled again regained power, no MAL codes now not showing any knock. Will dive into it later and post my findings. Has anyone else ever experienced this issue? If so what were your findings

 

[John Larkin]

Unfortunately, this is 37 year old wiring. Oddities will at best, be minimal. I had a 1964 Pontiac with break in the harness I had to send out 30 years ago, I would have never found it.

 

[MONSTER GN]

Unfortunately, this is 37 year old wiring. Oddities will at best, be minimal. I had a 1964 Pontiac with break in the harness I had to send out 30 years ago, I would have never found it.

As much as I hate to say it, im willing to bet it's something I did installing scanmaster, in the freezing cold in a fellow turbo Buick members driveway. And even if so I'm not ashamed to admit a screw up and if it's something I did I'll still advise