P2062: Reductant/Regeneration Supply Control Circuit/Open
What to do
Several reductant-related warnings appearing together usually means one supply wire, not many failures — worth saying before anyone quotes on the hardware list. The inducement caution from P2059 applies: the car feels fine while a countdown runs.
What this code means
The supply line feeding the aftertreatment system's dosing and regeneration hardware has failed open — one switched feed, many consumers.
Urea solution freezes at minus eleven degrees, and the system is built around that fact. The tank, the lines and the injector all carry heaters, the pump needs power, and on many vehicles one controlled supply feeds the lot — switched by the module so nothing drains the battery after shutdown. An open here therefore takes the whole dosing system offline at once: no heaters, no pump, no dosing — which in winter means the system cannot even thaw itself to find out what else works.
The corpus's one-shared-thing argument, on the exhaust's plumbing: a cluster of simultaneous reductant faults — heater codes, pump codes, dosing codes together — is this one supply until proven otherwise, not a system-wide failure.
Likely causes
Start here
- Open circuit in control wiring · moderate
- Blown fuse or failed supply · easy
- Corroded or loose connector · easy
Rare
- Failed control module · specialist
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
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
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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