P2063: Reductant/Regeneration Supply Control Circuit Low
What to do
As P2062 — one wire explaining many warnings, and a countdown that runs while nothing feels wrong.
What this code means
The aftertreatment supply circuit reads low — shorted to ground, or open where the resting state reads high.
P2062's picture with an electrical direction attached: wiring and connectors first, and the multi-fault cluster reading as one supply fault applies unchanged.
Likely causes
Start here
- Wiring shorted to ground · moderate
- Open circuit in control wiring · moderate
- Corroded or loose connector · easy
Symptoms
Components involved
Information, not instruction
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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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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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