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B1946 is a diagnostic trouble code (DTC) for "Climate Control A/C Post Evaporator Sensor Circuit Failure". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The B1946 code is a manufacturer specific body code related to the climate control system. In this case, the engine control module (ECM) has detected a failure in the evaporator temperature sensor for the climate control system or A/C.
A code B1946 will be stored when the ECM detects a voltage signal from the post evaporator sensor that is signalling a failure (the signal should be approximately 5 volts depending on vehicle make and model).
Under normal operation, the LH and RH discharge temperature sensors receive a ground from the Dual Automatic Temperature Control (DATC) module. The evaporator discharge temperature sensor receives a ground from the DATC module. A 5-volt reference voltage is supplied to the LH and RH discharge temperature sensors from the DATC module. A 5- volt reference voltage is supplied to the evaporator discharge temperature sensor from the DATC module.
Several problems may cause a B1946 code including:
Symptoms of a B1946 code may include:
A mechanic may use several methods to diagnose a B1946 trouble code, including:
Because a vehicle’s safe driving operation most likely will not be impacted due to faults that store a B1946 code, this code is not considered to be a serious code. When this code appears, it is recommended to take your vehicle to your local service center or mechanic for repair and diagnosis as soon as possible.
Several repairs can fix a B1946 trouble code and include:
It is always recommended to take all proper safety precautions when working with the electrical components of your vehicle and to carefully follow service instructions. With more complicated electrical repairs, it is recommended to seek assistance from a professional.
In addition, note that the evaporator core, driver side heater core, and passenger side heater core discharge air temperature sensors have the same diagnostic procedure.
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