Service esc, parking brake, and check engine light flashing

[Hodgez]

My 2020 Silverado 1500 RST 5.3 8 speed occasionally has the service esc, parking brake, and check engine light comes on flashing then after just a minute all of it turns back off. The truck drives fine (no misfires) with no clunky shifting or anything. I believe it may be a fluke and the computer just occasionally goes haywire. Anybody else have any thoughts on this?

[newdude]

Codes?  Did you have it scanned yet?  

[gemarsh]

Have you checked the ground strap behind the drinkers front tire, somewhat under the carpet liner?

[repairman54]

4 yr old battery could be weak. Just because it cranks up and fires up doesn't mean it's good. 

Whenever you start it all the onboard modules are booting up, low voltage during that phase will confuse modules and set wacky codes and warnings. Battery in top condition is critical in modern vehicles. Code scan and battery test are the 2 first diagnostic steps.

[901at4]

On 12/19/2024 at 7:35 AM, repairman54 said:

4 yr old battery could be weak. Just because it cranks up and fires up doesn't mean it's good. 

Whenever you start it all the onboard modules are booting up, low voltage during that phase will confuse modules and set wacky codes and warnings. Battery in top condition is critical in modern vehicles. Code scan and battery test are the 2 first diagnostic steps.

yes.. this was my issue. check the battery voltage. my 5 year old battery showed 12.5. charged it up and it was fine for 2 days then same issue. replaced the battery and all is well. voltage fluctuations throws all kinds of codes. when that accelerator voltage goes out of whack its going into limp mode.

[L87Powered]

As stated above, replace battery.