P208D code meaning
Reductant Pump A Control Circuit High
Powertrain system Generic code P20xx codes Check engine light
What P208D means
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.
P208D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P208D
- MIL and DEF system warning
- No DEF dosing, rising NOx
- Countdown to speed limit or no-restart
Common causes of P208D
- Most 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
- Less likelyInternal fault in pump or pump controller
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Reductant pump
What each part of P208D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 0 | Area: fuel and air metering and auxiliary emission controls. |
| 8D | The exact fault in that area. |
What to do next
- Note P208D and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P208D
What does P208D mean?
P208D means "Reductant Pump A Control Circuit High". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P208D?
Drive gently and only to a workshop. With P208D the car can go into limp mode (reduced power) to protect itself.
Will P208D fail an emissions test?
Yes, it can. P208D is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P208D to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P208D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.