P2064 code meaning
Reductant/Regeneration Supply Control Circuit High
Powertrain system Generic code P20xx codes Check engine light
What P2064 means
P2064 closes the supply control group that begins with P2062. The line that switches power to the reductant supply, in a few layouts to regeneration hardware, carries a level that only a connection to a positive feed can explain, or the stage stays live while the controller has it switched off. No manufacturer documents P2064 publicly. Related component codes show how such a fault is caught: Deutz files a DEF pump high side shorted to battery as P05F0-00 on its EMR L1 secondary controller, and Ford's 2023 diesels set P208D once pump voltage tops 16 V or the pump controller draws over 5 A with the driver on, confirmed within 2 s. Suspects are a chafed wire touching a powered circuit, a welded relay contact or a wet connector. Unlike P2063 the pump may keep running unbidden, yet dosing is still suspended.
P2064 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor1 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2064
- MIL and SCR or DEF warning in the cluster
- DEF pump audible after it should have stopped
- Countdown toward speed limit or no-restart after repeated faults
Common causes of P2064
- Most likelyControl line chafed through and touching a powered wire
- PossibleSupply relay contact welded closed
- PossibleWater or corrosion bridging pins in the supply connector
- Less likelyFaulty output stage in the controlling module
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 P2064 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. |
| 64 | The exact fault in that area. |
What to do next
- Note P2064 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 P2064
What does P2064 mean?
P2064 means "Reductant/Regeneration Supply Control Circuit High". P2064 closes the supply control group that begins with P2062. It is a generic code, so it means the same on every make.
Is it safe to drive with P2064?
Drive gently and only to a workshop. With P2064 the car can go into limp mode (reduced power) to protect itself.
Will P2064 fail an emissions test?
Yes, it can. P2064 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 P2064 to fix?
Difficulty: medium. A typical repair takes 1 to 3 hours of work. This is a job for a workshop.
Will P2064 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.