What is the P2046 fault code What is the description of the Reducing Temperature Sensor Circuit Intermittent fault? How do I fix the P2046 fault code What are the causes and symptoms of the P2046 error code?
What is the P2046 fault code? What does it all mean?
If the powertrain control module, (PCM), receives a voltage signal at the reducer temperature sensor circuit that is not within the expected parameters, a code P2046 will be set.
This code can only be seen on diesel engines. Although the catalyst system reduces all exhaust emissions, some applications also have a NOx trap. EGR systems, which reduce nitrogen oxides by exhaust gas recirculation (EGR), go one step further. Even with EGR, diesel particulate filter and catalytic converter, the diesel engines of today are not sufficient to meet emission standards. This is why the selective catalyst reduction (SCR system) was invented.
To burn away any harmful particles in the exhaust system, it is necessary to heat the fluid at high temperatures. A diesel exhaust fluid is sprayed through the SCR system. “Adblue” Or “DEF” In the exhaust pipe, in front of your catalytic converter. The liquid is sprayed in a precise manner to raise the temperature and make it more efficient. This liquid extends the life expectancy of the filter element and reduces harmful emissions into the atmosphere.
The PCM or an independent control unit that interacts with it monitors the SCR system and controls it. Both cases monitor the inputs from O2, NOx and exhaust gases temperature sensors, and spray the diesel exhaust fluid at appropriate times.
Spraying Adblue should be done precisely to ensure that the exhaust temperature remains within acceptable limits and the filtering is effective. The reduction / regeneration pump is used to raise Adblue pressure as needed. The PCM controls voltage at the supply pump. The PCM monitors the voltage of the supply pump and determines if there are any leaks in the system. If there is an abnormal or intermittent voltage signal detected in the reduce temperature sensor circuit, the code P2046 will trigger.
There are many vehicles that can be affected by the P2046 fault code, including models from Mercedes-Benz, Sprinter, Smart and GMC.
What is the P2046 Fault Code?
Below are some reasons to set fault code P2046:
- Problems with short circuiting of exhaust gas temperature sensors
- – Defective reductant temperature sensor
- – Leakage of the exhaust system
- – PCM or SCR control module defect
What are the symptoms of the P2046 Fault Code?
These symptoms may be present in vehicles with code P2046.
- – Illumination for check engine lights
- – Excessive black tar from exhaust during acceleration
- – Higher fuel consumption
- – Reduced engine performance
- – Setting related codes
How to Fix the P2046 Fault Code
- Repair and replacement for damaged or burnt cables and connectors
- – Repair or replacement a short-circuited temperature sensor for exhaust gases
- – Removing the defective sensor for the reduction temperature
- – Repairing exhaust system leaking
Note: In diagnosing this code, the most common error is to replace the oxygen sensors with the exhaust gas temperature sensor. Fault code P2046 cannot be fixed by such a repair.
How Serious Is the P2046 Fault Code
P2046 doesn’t directly affect vehicle drivability but it is still a serious fault code and must be resolved. It is possible to disable the SCR. Vehicles that fail to function properly in their exhaust systems will not pass emission tests. This malfunction may lead to more costly repairs down the road. Failure to correct the causes of code retention in a timely manner can lead to catalyst damage.
