P2055 code meaning
Reductant Injection Valve Circuit High (Bank 1 Unit 2)
Powertrain system Generic code P20xx codes Check engine light
What P2055 means
P2055 is set when the control line of DEF injector 2 on Bank 1 is shorted to battery positive. In GM's 2025 diesel table (25OBDG04B) the power stage of metering valve 2 reports the short; with more than 11 V and 30 faulty readings out of 60 the ECM stores a Type A fault, just as P2049 does for valve 1. Deutz assigns failure type 12 (voltage above normal or short to the high source) to metering unit 2 on EMR5 engines. On Ford's 2023 diesels the code instead describes a coil resistance more than 2 ohm above expectation, which hints at corroded terminals or an ageing winding. Whatever the platform, a driver that detects overvoltage is disabled, so the second dosing point delivers nothing until the circuit is repaired.
P2055 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 P2055
- MIL on
- Second dosing point inactive
- Increased NOx emissions
Common causes of P2055
- Most likelyControl line of injector 2 shorted to battery positive
- PossibleCoil resistance too high, corroded terminals (Ford definition)
- Less likelyDefective output stage for valve 2
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Reductant injection valve
What each part of P2055 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. |
| 55 | The exact fault in that area. |
What to do next
- Note P2055 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 P2055
What does P2055 mean?
P2055 means "Reductant Injection Valve Circuit High (Bank 1 Unit 2)". P2055 is set when the control line of DEF injector 2 on Bank 1 is shorted to battery positive. It is a generic code, so it means the same on every make.
Is it safe to drive with P2055?
Drive gently and only to a workshop. With P2055 the car can go into limp mode (reduced power) to protect itself.
Will P2055 fail an emissions test?
Yes, it can. P2055 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 P2055 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P2055 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.