P2049Reductant Injection Valve Circuit High (Bank 1 Unit 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2049 is the opposite electrical case for the Bank 1, unit 1 DEF injector: the low-side control line sees battery voltage, for instance through contact with a powered conductor or water inside the connector. On the 2014 Cruze diesel GM rates it Type B (two trips), whereas the LML and the 2018 diesel tables treat it as Type A; the 2018 test needs more than 11 V and counts 30 bad samples out of 60 at 100 ms. Deutz lists it for the EMR5 metering unit as an over-normal voltage or high-side short, and Ford's 2023 summary gives an injector current below 0.1 A as the trigger. GM's DEF bulletin sorts P2049 among non-tamper faults, so it brings up the emission service message rather than the tamper warning. The output stage shuts off to protect itself, which stops dosing.
- What you may notice
- MIL on (on some GM diesels only after the second trip)
- Service emission system message
- Higher NOx because no DEF is injected
- Likely causes
- LikelyControl wire shorted to a supply wire in the harness
- PossibleMoisture or corrosion bridging pins at the injector connector
- PossibleInternal fault of the DEF injector coil
- RareDefective output stage in the control module
- 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.