Powertrain, generic (extended)

P208A Reductant Pump A Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P208A reports an open or otherwise faulty drive circuit of the main DEF pump, the one that builds dosing pressure. Ford's 2023 diesels flag it when pump voltage sits between 2.6 and 3.4 V or the pump controller supply falls under 6 V, tested with the driver off and confirmed after 8 s. GM's 2018 diesel table takes a phase-open message from the DEF module, 32 of 40 samples, Type A; Volkswagen's 2014 Touareg TDI expects 4.70 to 5.40 V on an open line, and Deutz EMR5 files current below normal as P208A-13. Several bulletins blame software rather than parts: Volvo and Mack 2016–2017 chassis at cold start, Range Rover Velar 2.0 diesel together with P208C-11, and GM 23-NA-008 for 2022 trucks whose pump ran against frozen DEF. FCA counts it among inducement triggers.

Likely causes

Unplugged, corroded or broken pump connector or wire
Pump controller or ECU software (Volvo/Mack, JLR, GM 23-NA-008)
Low supply to the pump controller from fuse, relay or ground
Pump motor winding open, pump unit failed

Symptoms

  • MIL and DEF dosing malfunction message
  • No engine restart countdown
  • Fault often logged at cold start

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 pumpreductant pump relayreductant supply harness

Related codes

P208BP208CP208DP20FAP2062P05EE

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