Code 43 (and 24) on Hard Acceleration only
 

I've got a 1990 K5 Blazer with a 350 cu in TBI equipped engine. I used to get a code 43 before I got the main harness fixed but now I got one as I was trying to accelerate on the highway, I also got a code 24 too in that instance. If I only get a code 43 on hard acceleration is that a cause for concern? Could I somehow test the ESC module and sensor? Also is the code 24 vehicle speed sensor a dire issue as well?

Thanks.

Does your speedometer work? I believe the VSS for that year is in the cluster and is driven by the speedo cable.

The code 43 can be caused by a faulty knock sensor. I don't know of any way to check the ESC module other than "replace with known good part".

The speedometer works perfectly fine which confuses me even more, I guess both of them were false positives because I drove today and the error codes did not activate.

Sounds like it fixed itself. If only they could all be that easy...

I'm still waitting for my driveline to swap itself lol

Glad it went away... hopefully it doesn't come back