Rick's Free Auto Repair Advice

Chevrolet Cobalt Airbag light on

Fix Cobalt airbag light on

Chevrolet seems to have a common problem with a Cobalt airbag light on for the vehicles listed below. If you scan the computer, you’ll most likely come up with series B0085 trouble code. The definitions are listed below. As you can see, all the code variations refer to the left front side impact sensor circuit.

B0085 01: Left Front Side Impact Sensor Short to Battery
B0085 02: Left Front Side Impact Sensor Short to Ground
B0085 04: Left Front Side Impact Sensor Open Circuit
B0085 0F: Left Front Side Impact Sensor Erratic
B0085 39: Left Front Side Impact Sensor Internal Electronic Failure
B0085 3A: Left Front Side Impact Sensor Incorrect Component Installed
B0085 71: Left Front Side Impact Sensor Invalid Serial Data Received

Chevrolet Cobalt Models affected

2008 – 2010 Chevrolet Cobalt 2.2
2008 – 2010 Chevrolet Cobalt 2.0
2008 – 2008 Chevrolet Cobalt 2.4
2008 – 2010 Pontiac G5 2.2
2008 – 2008 Pontiac G5 2.4

Diagnose Cobalt airbag light on

The cause of the B0085 trouble code is either a bad connection in the wiring harness connector or a bad impact sensor. Start by removing the door trim panel on the driver’s door to access the Side Impact Sensor (SIS). Next, remove the console to get to the Sensing and Diagnostic Module (SDM), the airbag computer.

Poor connections inside the connectors are a common cause for this trouble codes. So disconnect and reconnect the connectors at both ends of the harness numerous times to

15306362 connector

Side impact sensor connector #15306362

reestablish a good connection at the terminals. Then turn the key to RUN and check for current codes. If the code disappears, replace the connector. Purchase a new connector pigtail at the dealer. If the code is still present, replace the SIS.


15821098  side impact sensor

Side impact sensor driver’s door #15821098 side impact sensor


The side impact sensor part number is 15356725


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