It sounds like the start stop control capacitor is bad, but we should check the fuses first, here is a guide to help you and fuse locations # 5 BCM and the MSM above the left rear fender well. You might eb able to reset the system, here is how:
Reset Criteria
The stop/start capacitor control module calculates the state of health of the stop/start capacitor and sends it to the ECM. If a bad state of health is determined, the charging and discharging of the stop/start capacitor is disabled. If the stop/start capacitor or stop/start capacitor control module is replaced, the reset procedure will need to be completed.
Reset Procedure
Note: Ensure the following conditions are met before performing the reset procedure, or the reset procedure may fail.
No DTCs are present
Battery voltage is above 11 V.
No battery charger is installed while performing the reset procedure
Note: You can only perform 1 reset per ignition cycle. If you need to perform the reset procedure again, you must shut off the vehicle and wait 3 minutes.
Ignition ON, engine OFF
Command the Stop/Start Capacitor Control State Of Health Reset with a scan tool.
Wait 2 minutes for the state of health reset procedure to complete.
If these are okay let's do a CAN scan which is easy to do, you can get a CAN scanner from Amazon for about $30.00 here is a video to show you how.
https://youtu.be/u-4syLc-ifQ
here is a scanner link
https://amzn.to/3o41KcZ
Here is the location of the start/stop capacitor module and fuse locations in the diagrams below. Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Monday, August 1st, 2022 AT 10:11 AM