BARO sensor reading low
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Trailering
Joined: Aug 2025
Posts: 24
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BARO sensor reading low
95 7.3 automatic
BARO is reading 8.8 PSI KOEO according to Forscan. Raises maybe 1 PSI at most when running the truck hard. I am at 480 ft above sea level lol. Truck runs good otherwise. No codes. Unplugged it still reads 8.8 PSI but seems to pull a little harder although shifts are much rougher. Shouldn't unplugged default to sea level PSI? I would think if the truck thought i was at 14,000 ft it would run horrible no?
BARO is reading 8.8 PSI KOEO according to Forscan. Raises maybe 1 PSI at most when running the truck hard. I am at 480 ft above sea level lol. Truck runs good otherwise. No codes. Unplugged it still reads 8.8 PSI but seems to pull a little harder although shifts are much rougher. Shouldn't unplugged default to sea level PSI? I would think if the truck thought i was at 14,000 ft it would run horrible no?
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Trailering
Joined: Aug 2025
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It does. Would it give a reading unplugged though? If so does that mean 8.8 is baseline for the PCM?
Lead Driver
Joined: Apr 2016
Posts: 7,182
Likes: 1,336
From: Bahstun
BARO: Barometric pressure sensor
Strategy input; PCM uses this to adjust fuel quantity and injection timing for optimum running
and minimum smoke, also glow plug on time to aid starting at higher altitudes; 5 volts in, @4.6
volts/14.7 psi at sea level, decreasing as altitude increases. PID: BARO (pressure)
Maybe you have a shorted or crossed wire if reading so low?
Strategy input; PCM uses this to adjust fuel quantity and injection timing for optimum running
and minimum smoke, also glow plug on time to aid starting at higher altitudes; 5 volts in, @4.6
volts/14.7 psi at sea level, decreasing as altitude increases. PID: BARO (pressure)
Maybe you have a shorted or crossed wire if reading so low?
Mountain Pass
Joined: Jan 2009
Posts: 174
Likes: 2
There is a “BaroV” PID, and it reads the correct pressure. In fact, there are 2-3 options for PID’s to select from for Baro, MAP and EBP. And options for what units you’re displaying. There’s even a frequency option for the MAP, separate from a PID that will display PSI or KPa.
Hope this helps someone else in the future.
Last edited by rusty1161; Apr 10, 2026 at 10:03 PM.
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