P2227🔧 Engine management (barometric pressure sensor)Stop and fix promptly

P2227: Barometric Pressure Sensor A Range/Performance (Meaning, Causes, Fixes)

Reviewed 2026-10-23 · Based on 2 cited source(s)

What P2227 means

The engine computer needs to know the outside air pressure, which changes with altitude and weather, to work out how much fuel to add. It compares that barometric reading with intake manifold pressure and other sensor readings. P2227 is the generic code for barometric pressure sensor "A" Circuit Range/Performance: the sensor or its circuit is working but its reading is outside the expected range or doesn't make sense against the other sensors. OBD-Codes.com lists Chevy, Mazda, Volvo, Acura, Honda, BMW, Isuzu, Mercedes-Benz, Cadillac, Hyundai, Saab, Ford and GMC among makes that use it. The sources differ on where the sensor is. RepairPal says most manufacturers build it into the mass airflow (MAF) sensor or the engine computer itself, while OBD-Codes.com describes it as its own sensor whose location varies a lot by vehicle, sometimes with more than one barometric sensor, so the "A" tells you which one. Check your service manual for where yours is. OBD-Codes.com also notes that altitude matters: symptoms can get better or worse if you drive through mountains.

Severity: can I keep driving?

Stop and fix promptly

Get it checked soon. RepairPal rates P2227 as Urgent, and OBD-Codes.com calls it moderately high because a wrong barometric reading throws off the air/fuel mixture. OBD-Codes.com goes further and says not to keep driving while the fault is active, because left alone it could lead to expensive internal engine damage, though driving it briefly since the light came on is probably fine. If the engine misfires, smells of fuel or loses power, park it and have it diagnosed.

Common symptoms

Likely causes

Roughly most to least common, based on the sources below. Your vehicle may differ.

  1. A defective or damaged barometric pressure sensor (OBD-Codes.com)
  2. A failed mass airflow (MAF) sensor, where the barometric sensor is built into it (RepairPal)
  3. A clogged air filter (RepairPal)
  4. Wiring problems: opens, shorts, corrosion, loose or damaged connectors, or heat damage (OBD-Codes.com, RepairPal)
  5. Something blocking the sensor or a mechanical fault that throws off its reading (OBD-Codes.com)
  6. A failed engine computer, or engine computer software that needs updating (RepairPal, OBD-Codes.com)

Diagnostic steps you can do

⚠ Before you start

Work on a cool engine, parked on level ground with the parking brake set. Never work under a car supported only by a jack.

  1. Read all stored codes. If manifold pressure (MAP) or MAF codes are also set, they may point to the same problem.
  2. Check the air filter and replace it if it is dirty or clogged.
  3. Find where the barometric sensor is on your vehicle (a separate sensor, inside the MAF sensor or inside the engine computer) using your service manual.
  4. If it is a separate sensor, inspect it and its connector for damage, heat damage, looseness and anything blocking it. OBD-Codes.com advises disconnecting the battery before unplugging sensors.
  5. Testing the sensor needs a multimeter and the manufacturer's specified values; compare your readings with those specs.

Typical fixes

Repair costs vary widely by vehicle, region, parts brand and shop, so we don't quote prices. Get a written estimate after diagnosis.

🛠 When to call a pro

  • The engine misfires, smells of fuel or loses noticeable power
  • The barometric sensor is built into the engine computer
  • The code returns after replacing the sensor or air filter
  • Testing needs factory voltage specs or a software update

Where to buy

Plain search links. Always match parts to your exact year, make, model and engine.

OBD2 scanners on Amazon Parts at Advance Auto Parts catalog at RockAuto

FAQs

Is P2227 serious?

Both sources treat it as serious. RepairPal rates it Urgent and OBD-Codes.com calls it moderately high, because a wrong barometric reading throws off the fuel mixture and could eventually damage the engine.

Is the barometric pressure sensor the same as the MAP sensor?

Not exactly. The barometric sensor measures outside air pressure, while the manifold absolute pressure (MAP) sensor measures pressure inside the intake. On some vehicles the barometric reading comes from inside the MAF sensor or the engine computer, and RepairPal lists MAP and MAF sensor replacement as common repairs, so check your service manual before buying parts.

Can a dirty air filter cause P2227?

RepairPal lists a clogged air filter as a common trigger, so it is a cheap first thing to check. OBD-Codes.com focuses on the sensor, its wiring and the engine computer instead.

How much does it cost to fix P2227?

Neither source gives a repair cost. It depends on the cause, from an air filter to a sensor or an engine computer update, so get a written estimate after diagnosis.

Sources

  1. OBD-Codes.com: P2227 Barometric Pressure Sensor A Range/Performance (Patrick Cameron)
  2. RepairPal: P2227 Barometric Pressure Sensor "A" Circuit Range/Performance (rated Urgent)

Last reviewed 2026-10-23. Code definitions and repair steps can vary by manufacturer. Confirm with your vehicle's service information.