Code result
P2043
Reductant Temperature Sensor A Circuit Range/Performance
Moderate severity
What it means
Reductant temperature sensor A reading is within electrical range but plausibility check fails — slow response or sticks at one value through a tank-warming cycle.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Sensor drifts or sticks
highOne of the most commonly reported causes for this code — check this first.
Sensor element aged beyond calibration window
lowLess common, but worth ruling out after the more likely causes.
Sensor mounting loose - signal damping
lowLess common, but worth ruling out after the more likely causes.
Related help
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