P2053Reductant Injection Valve Circuit/Open (Bank 1 Unit 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2053 concerns a second DEF injector on the same exhaust line as Bank 1, unit 1, used where a manufacturer doses at two points, for instance ahead of two separate catalysts. GM's 2025 table (25OBDG04B, which also covers an inline-six diesel) monitors this DEF metering valve 2 with the same open-load logic as valve 1: more than 11 V, 30 faulty samples out of 60 at 100 ms, Type A; a separate P1C30 checks its coil temperature after a long soak. Deutz's EMR5 engines assign P2053 to metering unit 2, with failure bytes for current above normal (grounded) and below normal (open). If valve 2 drops out, valve 1 keeps working, so the downstream catalyst simply loses its DEF and NOx rises only partly, often noticed just through the MIL.
- What you may notice
- MIL on
- Slightly higher NOx, little noticeable otherwise
- DEF system message
- Likely causes
- LikelyDisconnected or corroded plug at DEF injector 2
- PossibleBroken wire between control module and injector 2
- PossibleOpen coil in injector 2
- 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: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.