P2063Reductant/Regeneration Supply Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2063 says the reductant or regeneration supply control circuit reads too low, the classic signature of a grounded control line or of a load drawing far more current than it should, which pulls the driver output down. No manufacturer documents P2063 publicly. The comparable component code in Ford's 2023 diesel summary is P208C, set when reductant pump current exceeds 5 A or the pump controller draws more than 15 A; Deutz files a grounded DEF pump high side as P05EF-00. Seized pump motors, especially after DEF has crystallised, and harness damage near the tank are the usual suspects. While P2062 means no current at all, here the stage is overloaded, and fuses or relays may be found burnt. Dosing is suspended until the circuit is repaired.
- What you may notice
- Engine or emission warning lamp on
- Fuse for the DEF supply blows repeatedly
- Dosing suspended, possible speed or restart limitation
- Likely causes
- LikelySupply control wire shorted to ground near the tank
- PossiblePump motor seized or blocked by DEF crystals
- RareInternal short in the pump winding
- 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: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.