Reductant Tank Temperature Sensor Circuit Low
The P205C code indicates that the reductant tank temperature sensor circuit is reading a voltage lower than the expected range. This sensor monitors the temperature of the diesel exhaust fluid (DEF) in the tank. A low voltage reading typically points to a short to ground, a faulty sensor, or wiring issues. This can affect the DEF system's ability to properly dose fluid for emissions control, potentially leading to increased NOx emissions and triggering the check engine light.
1. Most Common Causes
- Short to ground in the sensor circuit
- Faulty reductant tank temperature sensor
- Damaged wiring or connector
- Corrosion or moisture in the sensor connector
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or limp mode
- Increased diesel exhaust fluid consumption
- Possible failure of emissions tests
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes.
Step 2: Visually inspect the sensor and wiring for damage, corrosion, or loose connections.
Step 3: Measure the sensor resistance and compare to manufacturer specifications; replace if out of range.
Step 4: Check for shorts to ground in the circuit using a multimeter.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive short distances, but the vehicle may enter limp mode to protect the emissions system. Prolonged driving can cause increased emissions and potential damage to the DEF system.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on whether the sensor or wiring needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.