P2063 code meaning
Reductant/Regeneration Supply Control Circuit Low
Powertrain system Generic code P20xx codes Check engine light
What P2063 means
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.
P2063 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2063
- Engine or emission warning lamp on
- Fuse for the DEF supply blows repeatedly
- Dosing suspended, possible speed or restart limitation
Common causes of P2063
- Most likelySupply control wire shorted to ground near the tank
- PossiblePump motor seized or blocked by DEF crystals
- Less likelyInternal short in the pump winding
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Reductant supply pump
What each part of P2063 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. |
| 63 | The exact fault in that area. |
What to do next
- Note P2063 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 P2063
What does P2063 mean?
P2063 means "Reductant/Regeneration Supply Control Circuit Low". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2063?
Drive gently and only to a workshop. With P2063 the car can go into limp mode (reduced power) to protect itself.
Will P2063 fail an emissions test?
Yes, it can. P2063 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 P2063 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P2063 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.