OBD-II code · Powertrain (generic, extended)
P202F Reductant/Regeneration Supply Control Circuit Range/Performance
The control line that gates the DEF supply pump or the regeneration heating circuit does not respond as commanded — duty cycle, current draw, or response time off-spec.
Is it safe to drive with P202F?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySupply relay aged or pitted contacts
- PossibleSupply pump motor brushes worn
- Less likelySensor element aged beyond calibration window
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Supply Pump, Reductant Supply Relay
Related codes
- P202CReductant Tank Heater Control Circuit High
- P202DReductant Leakage
- P202EReductant Injection Valve Circuit Range/Performance (Bank 1 Unit 1)
- P2030Fuel Fired Heater Performance
- P2031Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 2)
- P2032Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.