Reductant Tank Temp Sensor Circuit Intermittent/Erratic
The P205E code indicates that the powertrain control module (PCM) has detected an intermittent or erratic signal from the reductant (DEF) tank temperature sensor. This sensor monitors the temperature of the diesel exhaust fluid to ensure proper dosing for emissions control. An intermittent signal can be caused by wiring issues, poor connections, or a failing sensor, leading to potential emissions system malfunctions.
01. Most Common Causes
- Faulty reductant tank temperature sensor
- Damaged or corroded wiring/connectors
- Intermittent short or open in the sensor circuit
- PCM software or hardware issue
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or limp mode
- Increased DEF consumption or system warnings
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Connect a scan tool and verify the code P205E along with any other related codes.
Step 2: Visually inspect the reductant tank temperature sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Use a multimeter to test the sensor's resistance and compare with manufacturer specifications.
Step 4: Check for intermittent issues by wiggling the wiring harness while monitoring the sensor signal with a scan tool.
Step 5: If the sensor and wiring are okay, test the PCM for proper output signals and consider reprogramming or replacement if necessary.
04. Commonly Affected Makes
05. 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 or fail emissions. Prolonged driving could cause further damage to the emissions system.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a sensor replacement, plus diagnostic fees. Labor costs vary by shop.