Powertrain, generic (extended)

P2064 Reductant/Regeneration Supply Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2064 closes the supply control group that begins with P2062. The line that switches power to the reductant supply, in a few layouts to regeneration hardware, carries a level that only a connection to a positive feed can explain, or the stage stays live while the controller has it switched off. No manufacturer documents P2064 publicly. Related component codes show how such a fault is caught: Deutz files a DEF pump high side shorted to battery as P05F0-00 on its EMR L1 secondary controller, and Ford's 2023 diesels set P208D once pump voltage tops 16 V or the pump controller draws over 5 A with the driver on, confirmed within 2 s. Suspects are a chafed wire touching a powered circuit, a welded relay contact or a wet connector. Unlike P2063 the pump may keep running unbidden, yet dosing is still suspended.

Likely causes

Control line chafed through and touching a powered wire
Supply relay contact welded closed
Water or corrosion bridging pins in the supply connector
Faulty output stage in the controlling module

Symptoms

  • MIL and SCR or DEF warning in the cluster
  • DEF pump audible after it should have stopped
  • Countdown toward speed limit or no-restart after repeated faults

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–600
Time1–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

reductant supply pump

Related codes

P2062P2063P05F0P208D

References: law.cornell.edu, serdia.deutz.com, fordservicecontent.com.