Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Start the vehicle and monitor the BARO parameter with the scan tool for a steady value.

If the BARO parameter fluctuates rapidly:

Test for an intermittent and for a poor connection at the BARO sensor.
Test for proper BARO wiring harness routing.
Test all of the BARO sensor circuits for intermittent shorts or opens.
Test for an intermittent and for a poor connection at the control module.
- If the circuits test normal, replace the BARO sensor.