my camaro recently lit up the MIL. The car is a 12 pin ALDL '94 camaro z28. I scanned it and she dropped ten codes on me. There is a number of sensors experiencing low voltage but the one that caught my eye was DTC51. The car starts easily and runs like a champ. Can it really need a new PCM/PROM? Or am I just seeing the car in limp home mode?

The recorded codes are:
14 - coolant sensor - low voltage
34 - MAP sensor low voltage
45 - rich exhaust
44 - lean exhaust
43 - Electronic Spark Control - low voltage
42 - Electronic spark timing (EST) open or shorted
55 - ECM fault or oxygen sensor fault
54 - Fuel pump circuit fault or mixture control or ECM fault
53 - System voltage too high - over 17.7 volts to ECM or alternator voltage not normal - the volt meter on the dash looks normal

I want to think there is some sort of short or bad ground that causing all these low voltage codes. However, my understanding of DTC51 is that it is a checksum error on the PROM.

If it is a short, where do I even start looking for it?
What do you think is wrong with it?

thanks,
j.

 

Strange, someone posted 10 days ago just about the same set of codes.

(maybe you bought his car! )

Please start here:

https://chevroletforum.com/forum/gen...-advice-70981/

 

I didnt buy his car, but I did write to the other post...

thanks for pointing that out.