Code result
P0E12
Hybrid/EV Battery Pack Coolant Heater A Control Circuit/Open
High severity
What it means
The HV battery pack coolant heater A reports a control circuit/open condition. Battery preheating may be impaired in cold weather.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Open in heater control wire
highOne of the most commonly reported causes for this code — check this first.
Open heater element
mediumA plausible cause — test and verify before replacing parts.
Pin pushed back out of connector body
lowLess common, but worth ruling out after the more likely causes.
Related help
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