Powertrain, generic (extended)

P208C Reductant Pump A Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P208C sets when the drive of DEF pump A is pulled low, either by a ground fault or by current far beyond normal. Ford's 2023 diesels look for pump current over 5 A or pump controller current over 15 A with the driver off, the same 8 s window as for the open fault P208A. In GM's 2018 diesel table the DEF control module itself reports the phase shorted to ground; 20 out of 25 samples, Type A. The 2014 VW Touareg TDI trips once the control line falls under 2.74 V, and Deutz EMR5 files it as P208C-11, too little voltage or a path to ground. Jaguar Land Rover found P208C-11 together with P208A-13 on 2018–2019 Range Rover Velar 2.0 diesels and fixed it with a PCM update. Real shorts are often chafed wires near the tank or a seized pump, which may also blow the fuse. Dosing stops.

Likely causes

Pump drive wire shorted to ground near the tank
Seized or crystallised pump drawing excessive current
Software error in the controlling module (JLR Velar)
Water in the pump connector

Symptoms

  • MIL and DEF dosing malfunction warning
  • Pump fuse found blown
  • Countdown to no-restart

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–1,800
Time0.5–4 h

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

Parts involved

reductant pump

Related codes

P208AP208BP208DP20FCP2063P05EF

References: fordservicecontent.com, gsi.ext.gm.com, static.nhtsa.gov, serdia.deutz.com.