Reductant Injector Temperature Sensor Circuit Range/Performance Problem
The temperature sensor for the reductant injector is reading outside the expected range.
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What it means (plain English)
The computer is detecting that the temperature of the fluid being injected into the exhaust is either too high or too low, which can affect emissions control.
What the computer is actually seeing
The sensor should read a temperature between 0°C to 100°C (32°F to 212°F) during operation. If the signal fluctuates past these limits or shows an open circuit, the code will trigger.
What a healthy reading looks like
The reductant injector temperature should be between 0 and 100°C (32 to 212°F).
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. Inspect the wiring and connector for the reductant injector temperature sensor for damage or corrosion. If found, repair or replace wiring/connector.
- 22. Check the temperature of the reductant fluid using a thermometer. If it is not in the expected range (0 to 100°C), flush the system and replace the fluid if necessary.
- 33. Use a scan tool to monitor the live data from the reductant injector temperature sensor. If the reading is erratic or outside the range, replace the sensor.
- 44. If the sensor replacement doesn’t solve the problem, check for any exhaust restrictions or backpressure issues using a backpressure gauge.
Common causes
- Faulty reductant injector temperature sensor
- Wiring issues or damaged connectors
- Excessive exhaust backpressure or flow obstruction
- Fluid contamination or freezing
- ECM software issues
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive the vehicle with this code?
Yes, but it's advisable to fix it soon as it may affect emissions and the vehicle’s ability to pass a smog check.
Will this code come back after I clear it?
If the underlying issue hasn’t been resolved, yes, the code is likely to return.
Why does this code sometimes pair with P202E?
Both codes relate to reductant system issues, often stemming from similar causes like temperature sensor faults or plumbing issues.
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