Common Symptoms
- Check engine light illuminated
- Poor fuel economy
- Reduced engine power or acceleration
- Hard starting in high altitude conditions
- Black smoke from exhaust under load
- Engine may run rich or lean at varying altitudes
Most Likely Root Causes
- Faulty barometric pressure sensor
- Damaged or corroded wiring harness to BARO sensor
- Poor electrical connection at sensor connector
- PCM internal fault
- Vacuum leak affecting integrated MAP/BARO sensor
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Component Location
Barometric pressure sensor is typically integrated within the engine control module or mounted on the intake manifold near the throttle body.
Manufacturer Notes
Many modern vehicles use an integrated MAP/BARO sensor where the PCM calculates barometric pressure during key-on or wide-open throttle conditions.
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