Stuck On Coolant Pumps and Completely Drained HV Battery Surprise

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Heima

Well-known member
Joined
Feb 22, 2019
Messages
391
Instead of writing a long winded story, I decided to make it short.
If you are messing around with your 12V battery, and for some reason, your coolant pumps spin up to 50% and hold there even after the vehicle is powered off and locked. And if your HV battery now for some unknown reason has absolutely 0% charge and 0 miles range, then you are going to need forscan.
Note, 12v battery disconnecting and reconnecting does not fix this.
Use forscan to reboot the body controller to stop the pumps. Recalibrate the BECM state of charge to get back to the real SOC of the HV battery.
In this crazy state, caused by I believe a multimeter circuit breaker or fuse while measuring currrent drawn on the 12V battery, it was not possible to start the car. Messages on the dash about a depleted battery, and forscan reporting 0kw for ETE. Yet, forscan did report ok voltages for the cels, 3.645 v. So the battery wasn't actually depleted. If I didn't have Forscan, I would have been F'ed.
And clearing DTCs did not fix.
 
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