P208DReductant Pump A Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P208D means the drive of DEF pump A reads high, typically a wire touching battery positive, so the controller has lost authority over the pump. Unlike the open and low faults, Ford checks this one with the driver switched on: on 2023 diesels pump voltage over 16 V or pump controller current above 5 A sets it, confirmed in only 2 s. GM's 2018 diesel table relies on a phase-shorted-to-battery message from the DEF module, 20 of 25 samples, Type A, while the 2014 table watches for high voltage on the active driver. Volkswagen's 2014 Touareg TDI uses a control current above 4.00 A, and Deutz EMR5 files it as P208D-12. For 2013–2014 Ram 2500 and 3500 with the 6.7L Cummins, bulletin 18-010-14 reflashes the doser control unit when the MIL comes on with P208D or P202E. Check for wires pinched against powered cables and wet connectors.
- What you may notice
- MIL and DEF system warning
- No DEF dosing, rising NOx
- Countdown to speed limit or no-restart
- Likely causes
- LikelyPump drive wire shorted to a battery feed
- PossibleDoser control unit software (Ram 6.7L, 18-010-14)
- PossibleMoisture or corrosion in the pump connector
- RareInternal fault in pump or pump controller
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.