P0690

[Camaross540]

Replaced battery on 2012 ZL1 now it has a p0690 ecm/pcm voltage high I checked ecm fuses ,relays, battery connection ecm connection I erased code but it returns after second start has anyone had this issue

[jas121990]

Originally Posted by Camaross540

Replaced battery on 2012 ZL1 now it has a p0690 ecm/pcm voltage high I checked ecm fuses ,relays, battery connection ecm connection I erased code but it returns after second start has anyone had this issue

dumb question, but did you put the right battery back in it

[Camaross540]

Yes it's a Autozone replacement tried a advance auto parts battery today still same issue used friends snap on scanner everything checked out good wondering if its the ecu

[jas121990]

Originally Posted by Camaross540

Yes it's a Autozone replacement tried a advance auto parts battery today still same issue used friends snap on scanner everything checked out good wondering if its the ecu

you could check the voltage with a meter that would be my next step

[mpd659]

Did you ever find a fix? I’m having the same issue with my 2013 ZL1.

[bottletalk]

Originally Posted by mpd659

Did you ever find a fix? I’m having the same issue with my 2013 ZL1.

new battery? if it is it might be overcharged. leave the lights on for 15:minutes and check ur voltage again or your alternator might be pooched, check ur batt voltage with the car off then check it when it's running....I think 16vdc gives u the overvoltage.....use a meter. if you have a digital gauge on your display verify it's correct to the meter reading.
off your batt should be 12-13, running it can be anywhere from 12.5 to 14.5.

[mpd659]

Originally Posted by bottletalk

new battery? if it is it might be overcharged. leave the lights on for 15:minutes and check ur voltage again or your alternator might be pooched, check ur batt voltage with the car off then check it when it's running....I think 16vdc gives u the overvoltage.....use a meter. if you have a digital gauge on your display verify it's correct to the meter reading.
off your batt should be 12-13, running it can be anywhere from 12.5 to 14.5.

Thanks. I’ll give that a try soon. My battery is about 1.5 years old. I took it to autozone and they said the battery and alternator checks out good. I’m having issues where my battery isn’t charging all the way up all the time. So I’m not sure if that could be related.

[Mouse330]

K26 is the PWR/TRN relay, Remove this relay and find a relay with the same part number in the underhood fuse box. I think K55 Rear Defrost is the same relay, You obviously want to pull a relay that's not detrimental to the running of the engine. Switch them, clear the code and run the car and see if it solve the issue. If it does replace the PWR/TRN relay.

[mpd659]

Originally Posted by Mouse330

K26 is the PWR/TRN relay, Remove this relay and find a relay with the same part number in the underhood fuse box. I think K55 Rear Defrost is the same relay, You obviously want to pull a relay that's not detrimental to the running of the engine. Switch them, clear the code and run the car and see if it solve the issue. If it does replace the PWR/TRN relay.

That’s a great idea. Will give it a shot. Thank you.