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B1939 is a diagnostic trouble code (DTC) for "Air Bag Passenger Pressure Switch Circuit Short to Ground". 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 B1939 code is manufacturer-specific body code related to air bags. In this case, it means that the engine control module (ECM) has detected a fault with the passenger-side air bag pressure switch.
A code B1939 will be stored when the ECM has detected a short to ground from the passenger-side air bag pressure switch.
Several problems may cause a B1939 code including:
Symptoms of a B1939 code may include:
A mechanic may use several methods to diagnose a B1939 trouble code, including:
Due to the danger involved with repairing most items related to a vehicle’s air bag system, it is recommended to seek assistance from a professional for repair. If performing repairs yourself, be sure to follow all possible safety precautions and procedures.
Because a vehicle’s safe driving operation can be impacted due to faults that store a B1939 code, this code is considered a potentially serious code. When this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.
Several repairs can fix a B1939 trouble code and include:
It cannot be stressed enough that improperly handling a vehicle’s air bag system components can accidentally deploy the air bag modules and pre-tensioner seat belts, which can seriously injure you and others in the vicinity. Read all service warnings and cautions before handling air bag system components. Anything related to air bag repairs can be both difficult and dangerous, and is often best left to professionals for diagnosis and repair. If making any repairs at home, take care with the air bags when removed from the vehicle.
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.