P2062: Reductant/Regeneration Supply Control Circuit/Open

J2012 keeps this title deliberately broad: the controlled supply that feeds the reductant system or, in some layouts, the regeneration hardware, mostly a supply pump or the relay powering it. P2062 reports an open control circuit, so the commanded stage draws no current. No manufacturer documents P2062 publicly. Published systems monitor this function under component codes: Ford's 2023 diesels set P208A when reductant pump voltage sits between 2.6 and 3.4 V or the pump controller supply drops below 6 V, and Deutz reports an open DEF pump drive as P05EE-00. Typical causes are a blown fuse, a relay that does not close, a broken wire or a failed pump. Without supply the reductant line cannot build pressure and dosing stops; CARB treats this as part of reductant delivery monitoring.

Medium severity. Can I keep driving?Deal with it soon. If the instrument cluster shows a countdown, the car may not restart once it reaches zero.

Symptoms

Engine or emission warning lamp on
No reductant pressure, dosing stops
Restart countdown or speed limit on some vehicles

Most likely causes

Blown fuse or relay not closing in the supply path
Broken wire or unplugged connector at the pump
Supply pump with open winding

What to check, in order

Start with the simplest. You can tick off each step.

Check the AdBlue/DEF level and quality, and do not add additives or water
Check the continuity of the wire between the component and the control module.
Look for white crystals around the injector and the tank
Check connectors and heaters with the scanner
Run the dosing test available on your diagnostic tool
Replace parts only when the test points to that component

Good to know

Repair difficulty: medium
It can trigger limp mode.
It affects emissions.

What each character of P2062 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
0: Subsystem depends on the code range
62: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2062?

Deal with it soon. If the instrument cluster shows a countdown, the car may not restart once it reaches zero.

What causes code P2062?

The most common causes are: blown fuse or relay not closing in the supply path; broken wire or unplugged connector at the pump; supply pump with open winding.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.