P2047–P2056 Reductant Injection Valve Circuit/Open Bank 1 Unit 1
The circuit is broken somewhere - a cut wire, a corroded pin or an unplugged connector means the signal never arrives.
Can you drive it? The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.
Which code is which
Same fault, different cylinder or bank — diagnosed the same way. Several set together usually means one shared cause.
| Code | Definition | Severity |
|---|---|---|
P2047 | Reductant Injection Valve Circuit/Open Bank 1 Unit 1 | Investigate soon |
P2050 | Reductant Injection Valve Circuit/Open Bank 2 Unit 1 | Investigate soon |
P2053 | Reductant Injection Valve Circuit/Open Bank 1 Unit 2 | Investigate soon |
P2056 | Reductant Injection Valve Circuit/Open Bank 2 Unit 2 | Investigate soon |
The definition
P2047: Reductant Injection Valve Circuit/Open Bank 1 Unit 1.
P2047 is a manufacturer-specific powertrain code (the engine or gearbox). Its meaning is set by the carmaker rather than by the SAE standard, so a generic OBD-II reader will often show it as an unknown code or misread it.
What to check first
Cheapest and fastest checks first:
- Check the connector is fully seated and the locking tab is engaged. A half-seated plug is the single most common cause of an open circuit.
- Back-probe the pins and check continuity from the part back to the module connector.
- Inspect for a pushed-back or corroded terminal - the wire looks fine but the pin has backed out of the housing.
What actually causes this on a VAG
On a diesel with AdBlue, this is the reductant metering valve - the injector that sprays a fine mist of AdBlue into the exhaust ahead of the SCR catalyst, where it converts nitrogen oxides into nitrogen and water. The control unit has found no complete electrical circuit to that valve. On most VAG applications the valve is mounted on the exhaust underneath the car, in a hot, salty, stone-blasted place, so wiring and connector faults are at least as likely as a genuinely dead valve.
Most likely causes, in order
- Connector fault at the metering valve. Water, salt and road grit get into the plug and corrode or spread the pins, and the retaining clip is easily broken. Get the car up safely on proper stands or a lift, find the plug at the injector on the exhaust, unplug it and inspect for green or powdery deposits, then refit it until it positively latches.
- Damaged wiring along the underbody. The loom is clipped along the underside of the car and can be pulled, chafed or torn by a missing clip, an undertray coming loose, or kerb and speed-bump damage. Follow it from the valve as far forward as you can and look for wires hanging free, rubbed-through insulation or a missing section of clip.
- Failed valve coil. The winding inside the valve can go open circuit with heat and age. Measure across the valve's own pins with it unplugged: a solenoid coil normally reads a low resistance, so what you are looking for is no continuity at all. That points at the valve; a sensible reading sends you back to the harness.
- Supply, earth or control unit fault. Check the fuse for the AdBlue system and see whether other AdBlue components - pump, level sender, line heaters - are also reporting faults. If several are complaining together, the problem is upstream in a supply, an earth or the control unit, not in this one valve.
Worth knowing: Do not put this off. SCR emissions faults trigger the driver inducement system these cars are required by law to have: warnings first, then a countdown, then speed restriction and ultimately a refusal to restart the engine. Exactly how it escalates varies by model and market, but the end point is the same and the car is fine until you switch it off. Get it diagnosed while the countdown still has plenty of range left, and be aware that clearing the fault and resetting the inducement normally needs a capable scan tool.
Reading the code is the easy part
A code names the circuit that complained. What tells you why is watching the sensor behind it while the engine runs — and that is where a code reader stops and a diagnostic tool starts.
VAGPULSE reads every module in a VW, Audi, Skoda or SEAT — not just the engine — shows the live measuring blocks behind this fault, gives you the freeze-frame conditions it was logged under, and clears it once you have fixed it. It also does what a generic OBD reader cannot on a VAG: service resets, coding, adaptations, and Stage 1–3 flashing with your original file saved first.
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Common questions
What does P2047 mean?
P2047 means Reductant Injection Valve Circuit/Open Bank 1 Unit 1. The circuit is broken somewhere - a cut wire, a corroded pin or an unplugged connector means the signal never arrives.
Can I drive with P2047?
The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.