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B1938 is a diagnostic trouble code (DTC) for "Air Bag Passenger 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 B1938 code is manufacturer-specific (in this case General Motors) 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.
A code B1938 will be stored when the ECM has detected a resistance signal other than 1.4-2.9 ohms in the passenger-side air bag module circuit. In addition, the wiring harness between the passenger-side air bag module and SAS control module may have noted a fault or malfunction.
Several problems may cause a B1938 code including:
Symptoms of a B1938 code may include:
A mechanic may use several methods to diagnose a B1938 trouble code, including:
Note that listed detection conditions are for understanding the DTC outline before performing an inspection. Performing an inspection according to only the detection conditions may cause injury due to an operating error, or damage the system. When performing an inspection, it is recommended to always follow the inspection procedure.
Because a vehicle’s safe driving operation can be impacted due to faults that store a B1938 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 B1938 trouble code and include:
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 anyone who may be around you. Always read the service warnings and cautions before handling any air bag system components.
Remember, anything related to air bags can be both difficult and dangerous, and is often best left to professionals for diagnosis and repair. If making any repairs yourself, it is recommended to take care with the air bags when removed from the vehicle and store in a safe place.
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.