Our certified mechanics come to you · 12-month, 12,000-mile warranty
B1949 is a diagnostic trouble code (DTC) for "Climate Control Water Temperature 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 B1949 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 circuit for the climate control water temperature sensor.
A code B1949 will be stored when the ECM detects a coolant temperature signal circuit fault between the instrument pack and air conditioning/climate control unit (A/CCM). The A/CCM receives an engine coolant temperature voltage signal from the instrument pack.
The A/CCM monitors the engine coolant temperature circuit for open circuit, high resistance and short circuit conditions. If a fault is present, a DTC will be flagged. If a circuit fault occurs between the coolant temperature sensor and the instrument pack, the instrument pack output will default to a voltage equal to 20 °C (68 °F). If a circuit fault occurs between the instrument pack and the A/CCM, the A/CCM will substitute a default value of 76 °C (169 °F).
Several problems may cause a B1949 code including:
Symptoms of a B1949 code may include:
A mechanic may use several methods to diagnose a B1949 trouble code, including:
Because a vehicle’s safe driving operation will not be impacted due to faults that store a B1949 code, this code is not considered 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 B1949 trouble code and include:
With any repairs related to the electrical components of your vehicle, it is recommended to review your vehicle’s service manual, and if possible utilize the assistance of a professional to avoid additional costly repairs.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.