P2044 on Opel: How to Diagnose & Fix
Reductant Temperature Sensor Circuit Low
1 Opel model · 1 documented issue · 1 critical · $250-$1,500 repair
P2044 on Opel by model: symptoms, diagnosis and fix
Euro 6 Movano vans with the 2.3 dCi engine (shared architecture with the Renault Master and Nissan NV400) suffer well-documented SCR faults. The dominant failure modes are upstream/downstream NOx sensor degradation on higher-mileage vans, crystallised urea blocking the AdBlue injector on vehicles used for short trips, SCR catalyst contamination from incorrect fluid, and less commonly AdBlue pump or pressure faults. Once a fault is logged the van begins counting down remaining engine starts and will refuse to restart when the counter reaches zero, which strands a working vehicle. Typical codes are P20EE, P207F, P2202/P2203, P204F, P2044 and P2BAD/P2BAE.
Common Symptoms
- AdBlue warning with a remaining-range countdown (typically 1,500-2,400 miles)
- Emission system fault message and reduced power / limp mode
- Engine will not restart once the start countdown reaches zero
- Repeat AdBlue faults returning shortly after a repair
How to Fix
Diagnose before replacing parts: read live NOx sensor data and AdBlue rail pressure rather than fitting parts to the code. Typical repairs are a NOx sensor (approx. GBP 250-500), AdBlue injector (GBP 300-600), AdBlue pump (GBP 400-700) or SCR catalyst (GBP 800-1,500+). Clear the start countdown properly with the fault fixed. Prevention: use only fresh, in-date AdBlue to ISO 22241, never top up with water or screenwash, and give short-trip vans a regular motorway run so the injector runs hot enough to avoid crystallisation.
Sources for this issue (3)
P2044 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P2044 mean on a Opel?
P2044 stands for "Reductant Temperature Sensor Circuit Low." Set when the PCM detects the reductant (DEF) temperature sensor signal voltage is lower than expected, typically indicating a short to ground or a failed sensor. On Opel it is documented across 1 model: Movano.
What are the most common causes of P2044?
The most common causes of P2044 are: Short to ground in the signal circuit, Faulty reductant temperature sensor, Corroded or shorted connector, Damaged wiring harness, PCM/dosing control module fault. The specific cause varies by vehicle.
How much does it cost to fix P2044 on a Opel?
Published repair estimates on Opel range from $250 to $1,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.