P2047Reductant Injection Valve Circuit/Open (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
- P2047 covers the electrical path of the first DEF dosing valve on Bank 1, which in nearly every SCR layout is the only one. The controller watches the valve's low-side driver and flags an open load: a broken wire, an unplugged connector or a burnt-out coil. GM's 6.6 L LML table expects roughly 200 kOhm between pin and load for 3 s (Type A); GM's 2018 diesel table counts 30 faulty samples out of 60. Ford's 2023 diesel summary reads 2.6 to 3.4 V on the idle output within 2 s. Ram found loose terminals at the injector plug, Volvo VNR trucks a harness chafed by a loose heat shield. On the LGH/LML GM ranks P2047 as a tamper-type fault, so the warning sequence toward a speed limit starts early; with no DEF sprayed, NOx rises.
- What you may notice
- MIL on, often together with a DEF system warning
- Speed limitation countdown after continued driving
- Increased NOx, failed emissions inspection
- Likely causes
- LikelyLoose, corroded or pushed-out terminals at the DEF injector plug
- PossibleHarness wire broken or chafed through near the exhaust
- PossibleOpen coil inside the DEF injector
- RareFaulty output stage or software in the engine/dosing 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.