What Does P2226 Mean?
The barometric pressure sensor circuit A has an electrical malfunction. This sensor measures atmospheric pressure to help the PCM adjust fuel delivery and ignition timing for altitude.
Common Causes
40%
Failed barometric pressure sensor
25%
Open or short circuit in sensor wiring harness
20%
Poor electrical connection at sensor connector
10%
PCM internal circuit failure
5%
Sensor reference voltage supply fault from PCM
Diagnostic Steps
1
Step 1: Locate barometric pressure sensor (often integrated into MAP sensor or standalone unit)
2
Step 2: Check sensor connector for corrosion, bent pins, or moisture contamination
3
Step 3: Measure 5-volt reference voltage supply to sensor with key on, engine off
4
Step 4: Check sensor signal voltage and compare to expected barometric pressure reading (typically 3.5-4.5V at sea level)
5
Step 5: Test continuity of all sensor circuit wires back to PCM, checking for opens or shorts to ground/power
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The barometric pressure sensor circuit A has an electrical malfunction. This sensor measures atmospheric pressure to help the PCM adjust fuel delivery and ignition timing for altitude.
The most common cause of P2226 (Barometric Pressure Sensor "A" Circuit) is: Failed barometric pressure sensor
Typical repair costs for P2226 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but may experience poor performance, especially at altitude changes. Reduced fuel economy and potential driveability issues may occur.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2226 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System and Engine Management
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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