OBD-II code · Powertrain (generic, extended)
P2046 Reductant Temperature Sensor A Circuit Intermittent
Reductant temperature sensor A signal jumps or drops out intermittently — connector or harness fault.
Is it safe to drive with P2046?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyIntermittent connector
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
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
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Temperature Sensor, Reductant Temperature Connector
Related codes
- P2042Reductant Temperature Sensor A Circuit
- P2043Reductant Temperature Sensor A Circuit Range/Performance
- P2044Reductant Temperature Sensor A Circuit Low
- P2045Reductant Temperature Sensor A Circuit High
- P2047Reductant Injection Valve Circuit/Open (Bank 1 Unit 1)
- P2048Reductant Injection Valve Circuit Low (Bank 1 Unit 1)
- P2049Reductant Injection Valve Circuit High (Bank 1 Unit 1)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.