Reducing Agent Temperature Sensor Range/Performance Problem
The temperature of the reducing agent (urea) is outside the normal operating range.
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What it means (plain English)
The computer is measuring the temperature of the urea used to reduce emissions, and it's reading either too high or too low compared to what it should be.
What the computer is actually seeing
The ECM sees that the urea temperature sensor is reporting values that don't match pre-defined parameters, indicating a potential fault.
What a healthy reading looks like
Urea temperature should typically be between 15°C and 30°C (59°F to 86°F) when running; below -11°C (12°F) or above 40°C (104°F) can trigger this code.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check urea fluid level; it should be above the minimum required level. Decision: If low, refill and clear code. If normal, continue.
- 22. Inspect wiring and connectors at the urea temperature sensor for damage or corrosion. Decision: If damaged, repair or replace. If intact, continue.
- 33. Measure resistance at the temperature sensor with a multimeter according to manufacturer's specifications (typically 2.1kΩ at 25°C). Decision: If out of spec, replace the sensor. If within spec, continue.
- 44. Check for any contamination or freezing of the urea fluid. Decision: If contamination is present, flush the system and refill with fresh urea. If clear, proceed to the next step.
- 55. Verify the vehicle's operation in different conditions (cold start, normal operating temp). Monitor sensor readings. Decision: If readings remain out of range, replace the sensor.
Common causes
- Faulty urea temperature sensor
- Wiring issues in the sensor circuit
- Low urea fluid level or contaminated urea
- Thermal issues affecting the sensor location
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable, but you may have reduced emissions and potential fines if operating without fixing.
Will the code come back?
If the underlying issue isn't resolved (like a bad sensor or wiring), then yes, the code will likely return.
Why does this code sometimes appear with related codes?
Codes can be interrelated due to the shared circuitry or components of the urea system, affecting its performance.
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