GM Vehicle Airbag Code B0081

Written by Steve Chryssos | Mar 29, 2018 4:00:00 AM

Have you ever wondered how your car is able to detect if there is a child in the passenger seat of your car? This is a feature that is controlled by the PPS or Passenger Presence Module. This system is used to detect the size of the occupant in the passenger seat. If it detects a child sitting in the seat, it will not deploy the airbag.

Issue Diagnosis Test 1

Was the passenger seat replaced with a new or old seat? If you replaced the passenger seat then you will need to find the original weight sensor in the old seat and install it on the new seat.

Issue Diagnosis Test 2

If the seat was not changed, you will need to recalibrate the Weight sensor using a scanner that plugs right into the OBD port in the car. Many of the scanners that can read the airbag codes will be able to do this. Then take a look under the seat at all of the wiring to make sure all is connected and no wires are damaged or pinched. Next step is to calibrate/initialize the PPS weight sensor. This is done with a scan tool, there is an option for this in the scan tool under SRS Airbag menu to initialize, calibrate, zero out PPS.

Issue Diagnosis Test 3

The last step for this code if the first two steps absolutely do not work would be replacing the weight sensor. It may be located under the front passenger seat cushion (on the seat, not floor) It could also be mounted to the side of upper back part of the seat.

DTC	Description	Possible Root Cause
B0074 00	Flex Mat Sensor Performance	Sensing mat open circuit - Check the sensing mat for damage. If parts replacement is required, replace sensor mat only.
B0074 04	Flex Mat Disconnected	Sensing mat disconnected - Check sensing mat connections. Re-connect sensor mat.
B0081 42	Calibration Not Learned	Seat not rezeroed at seat supplier or dealership - Need to rezero the system.
B0081 11	Rezero Error	Failed rezero - Seat must be empty during rezero. Temperature must be within 32° F to 100° F (0° C to 38° C). - Check the system for DTCs. - Rerun the rezero sequence.
B101D 00	Electronic Control Unit (ECU) Hardware Performance - No additional information required	Check connections - If parts replacement is required, replace ECU only.
B101E 00	Electronic Control Unit (ECU) Hardware Performance - No additional information required	Check connections - If parts replacement is required, replace ECU only.
B101D 3a	Incorrect Component Installed	Check if the correct AOS and SDM components are installed
B1325 03	Battery Voltage Low	Check vehicle battery with IGN on RUN
B1325 07	Battery Voltage High	Check vehicle battery with IGN on RUN
U0140 00	Lost Communications BCM	Check BCM and clear DTC
U0151 00	Lost Communications SDM	Check SDM and clear DTC
U0155 00	Lost Communications IPC	Check IPC and clear DTC

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