Reductant Temperature Sensor
Measures the temperature of the urea solution, which decides whether dosing is attempted at all — the fluid freezes at around minus eleven degrees and dosing it as slush produces crystallisation. Without a trustworthy reading the module takes the conservative route and suspends dosing, which starts the legally mandated inducement sequence even though nothing mechanical is wrong. A fault here is consequently much more serious in January than in July, and worth reporting with the season attached. Note that a reading stuck cold has two explanations that look identical on a winter morning: a failed sensor, or a tank heater that genuinely is not working.
Also known as: adblue temperature sensor, def temp sensor, urea temperature sensor, reductant temp sensor
Referenced by 29 codes
Codes involving this component (29)
- P2ADA Reductant Tank Temperature Sensor B Circuit Range/Performance High
- P2ADB Reductant Tank Temperature Sensor B Circuit Low High
- P2ADC Reductant Tank Temperature Sensor B Circuit High High
- P2ADD Reductant Tank Temperature Sensor B Circuit Intermittent/Erratic High
- P2ADE Reductant Tank Temperature Sensor B Circuit High
- P2042 Reductant Temperature Sensor A Circuit Moderate
- P2043 Reductant Temperature Sensor A Circuit Range/Performance Moderate
- P2044 Reductant Temperature Sensor A Circuit Low Moderate
- P2045 Reductant Temperature Sensor A Circuit High Moderate
- P2046 Reductant Temperature Sensor A Circuit Intermittent Moderate
- P209F Reductant Tank Heater Control Circuit Performance Moderate
- P20BA Reductant Heater A Control Circuit Performance Moderate
- P20BE Reductant Heater B Control Circuit Performance Moderate
- P20C2 Reductant Heater C Control Circuit Performance Moderate
- P20C6 Reductant Heater D Control Circuit Performance Moderate
- P24FF Reductant Temperature Too High Moderate
- P205A Reductant Tank Temperature Sensor A Circuit
- P205B Reductant Tank Temperature Sensor A Circuit Range/Performance
- P205C Reductant Tank Temperature Sensor A Circuit Low
- P205D Reductant Tank Temperature Sensor A Circuit High
- P205E Reductant Tank Temperature Sensor A Circuit Intermittent/Erratic
- P20AC Reductant Metering Unit Temperature Sensor Circuit
- P20AD Reductant Metering Unit Temperature Sensor Circuit Range/Performance
- P20AE Reductant Metering Unit Temperature Sensor Circuit Low
- P20AF Reductant Metering Unit Temperature Sensor Circuit High
Other components in Exhaust and Emissions
- Oxygen Sensor 326
- EGR Valve 150
- Catalytic Converter 142
- NOx Sensor 118
- Reductant Injector 107
- Exhaust Gas Temperature Sensor 95
- Reductant Tank 95
- Diesel Particulate Filter 76
- SCR Catalyst 65
- EGR Cooler 62
- Exhaust Gas Differential Pressure Sensor 58
- Fuel Tank Pressure Sensor 58
- Exhaust Pressure Control Valve 56
- Reductant Heater 55
- Reductant Pump 51
- EVAP Vent Valve 43
- Exhaust Aftertreatment Fuel Injector 42
- Charcoal Canister 33
- EGR Position Sensor 32
- Secondary Air Injection Pump 32
- EVAP Leak Detection Pump 29
- EVAP Purge Valve 27
- Particulate Matter Sensor 24
- Reductant Control Module 24
- Reductant Level Sensor 23
- Secondary Air Switching Valve 22
- EGR Temperature Sensor 21
- Secondary Air Check Valve 21
- Catalyst Heater 20
- Catalyst Temperature Sensor 20
- Fuel Filler Cap 18
- EGR Cooler Bypass Valve 16
- Reductant Quality Sensor 16
- Exhaust Back Pressure Sensor 15
- Purge Flow Sensor 13
- Direct Ozone Reduction Catalyst 13
- EGR Vacuum Solenoid 9
- Fuel Vapour Temperature Sensor 5
- Fuel Additive Control Module 4
- Fuel Additive Tank 4
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