Reductant Level Sensor Range/Performance Problem
The system has detected a problem with the reductant level sensor reading.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The sensor that measures how much urea (DEF) is in the tank isn't giving accurate readings, which can affect emissions.
What the computer is actually seeing
The Engine Control Module (ECM) monitors the reductant level sensor and expects a certain voltage range (typically between 0.5V and 4.5V) corresponding to the DEF tank level. If the voltage is consistently out of range or intermittent, the code sets.
What a healthy reading looks like
The sensor should output a voltage proportional to the DEF level, typically 0.5V for an empty tank to around 4.5V for a full tank.
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.
- 1Check the DEF tank level; top off if low. If level is good, proceed to the next step.
- 2Inspect all wiring and connectors to the reductant level sensor for damage or corrosion. Repair as needed and retest.
- 3Use a multimeter to measure the voltage output from the reductant level sensor. Expected values should be between 0.5V (empty) and 4.5V (full). If out of range, replace the sensor.
- 4Clear the codes and test drive the vehicle to see if the code returns. If it does, further diagnosis of the ECM may be needed.
Common causes
- Faulty reductant level sensor
- Wiring issues (broken or shorted wires)
- Connector problems at sensor or ECM
- Insufficient DEF in the tank
- Contaminated DEF
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but fix it soon; prolonged operation can affect emissions performance.
Will this code come back after clearing it?
If there's a persistent issue with the sensor or wiring, it likely will.
Why does this code pair with sensor faults?
Commonly, damage to the wiring or the sensor itself leads to incorrect readings, triggering multiple codes.
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