Barometric Pressure Made Easy!

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A few years back, I wrote a post about determining barometric pressure based on location. This is important when troubleshooting the “Barometric Pressure – Data Erratic, Intermittent or Incorrect” fault code. It has been a while, so I thought it would be a good idea to update the post with a new link to quickly obtain the barometric pressure information.

How to find Barometer PressureA barometric pressure (BARO) sensor is internally installed inside the ECM and converts BARO into a voltage signal. ECM then uses this voltage signal for calibration of the fuel injection quantity and injection timing for altitude compensation.

The DTC sets once the ECM has detected an excessively low signal voltage. Here is a quick way to determine Barometric Pressure for your location. Some DTCs require this information for diagnosis.

  1. Open up your Internet browser and go to https://weather.com/
  2. Enter your state or city into the search bar
  3. Hit ENTER and your requested area weather displays
  4. Near the top, under “Right Now” look for pressure. That will be the “barometric pressure” for your current location.

About the Author

Bruce Cansler

Bruce Cansler started his automotive career in 1973 as a technician for Datsun. He retired from the U.S. Navy as a Seabee Construction Mechanic with 20 active years of service and 10 as a reservist, then spent time working in Ford, Lexus and Caterpillar dealerships. Bruce has obtained ASE certifications in both cars and medium/heavy trucks and has worked with the Commercial Vehicle Group at Mitchell 1 since 2009.