Powertrain, generic (extended)

P2063 Reductant/Regeneration Supply Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2063 says the reductant or regeneration supply control circuit reads too low, the classic signature of a grounded control line or of a load drawing far more current than it should, which pulls the driver output down. No manufacturer documents P2063 publicly. The comparable component code in Ford's 2023 diesel summary is P208C, set when reductant pump current exceeds 5 A or the pump controller draws more than 15 A; Deutz files a grounded DEF pump high side as P05EF-00. Seized pump motors, especially after DEF has crystallised, and harness damage near the tank are the usual suspects. While P2062 means no current at all, here the stage is overloaded, and fuses or relays may be found burnt. Dosing is suspended until the circuit is repaired.

Likely causes

Supply control wire shorted to ground near the tank
Pump motor seized or blocked by DEF crystals
Internal short in the pump winding

Symptoms

  • Engine or emission warning lamp on
  • Fuse for the DEF supply blows repeatedly
  • Dosing suspended, possible speed or restart limitation

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–900
Time0.5–3 h

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

Parts involved

reductant supply pump

Related codes

P2062P2064P202FP208C

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