What Does P2228 Mean?
The barometric pressure sensor A circuit voltage is reading lower than expected. This indicates the sensor is reporting abnormally low atmospheric pressure or has an electrical circuit fault to ground.
Common Causes
35%
Shorted sensor signal wire to ground
30%
Failed barometric pressure sensor with internal short
20%
Damaged sensor connector causing short circuit
10%
Water intrusion or corrosion in sensor or connector
5%
PCM internal circuit failure pulling signal low
Diagnostic Steps
1
Step 1: Disconnect barometric pressure sensor connector and measure signal wire voltage at PCM side (should read 5V reference)
2
Step 2: Check for continuity between sensor signal wire and ground (should be infinite resistance/open)
3
Step 3: Inspect sensor connector and terminals for corrosion, bent pins, or moisture
4
Step 4: With sensor disconnected, check sensor internal resistance and compare to specifications
5
Step 5: If wiring tests good, replace sensor and verify proper operation
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
The barometric pressure sensor A circuit voltage is reading lower than expected. This indicates the sensor is reporting abnormally low atmospheric pressure or has an electrical circuit fault to ground.
The most common cause of P2228 (Barometric Pressure Sensor "A" Circuit Low) is: Shorted sensor signal wire to ground
Typical repair costs for P2228 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but engine may run rich, experience poor fuel economy, and show reduced performance. May have difficulty starting at high altitudes.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2228 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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