OBD-II code · Powertrain (generic, extended)
P2044 Reductant Temperature Sensor A Circuit Low
Reductant temperature sensor A reads below its lower plausibility limit — short to ground. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P2044?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyShort to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.7–2 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Temperature Sensor
Related codes
- P2042Reductant Temperature Sensor A Circuit
- P2ACEReductant Temperature Sensor B Circuit Low
- P2041Reductant Injection Air Pressure Sensor A Circuit Intermittent
- P2043Reductant Temperature Sensor A Circuit Range/Performance
- P2045Reductant Temperature Sensor A Circuit High
- P2046Reductant Temperature Sensor A Circuit Intermittent
- P2047Reductant Injection Valve Circuit/Open (Bank 1 Unit 1)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.