P2064: Reductant/Regeneration Supply Control Circuit High
What to do
As P2062's family — and mention a battery that has started going flat overnight, because a supply stuck live is exactly how that happens.
What this code means
The aftertreatment supply circuit reads high — shorted to a supply, or open in a circuit that rests high.
The mirror of P2063. A supply stuck permanently live has its own cost: heaters that never switch off drain the battery and cook themselves, so a battery going flat alongside this code is the fault describing itself.
Likely causes
Start here
- Wiring shorted to voltage · moderate
- Open circuit in control wiring · moderate
- Corroded or loose connector · easy
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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