Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / 2F
Possible causes
- Supply relay aged or pitted contacts high
- Supply pump motor brushes worn medium
- Sensor element aged beyond calibration window low
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)
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 120–800 €
- Estimated time: 1–3 h
- Component: reductant supply pump
- Component: reductant supply relay
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012