What Does P2229 Mean?
The barometric pressure sensor A circuit voltage is reading higher than expected. This indicates the sensor is reporting abnormally high atmospheric pressure or has an electrical circuit fault.
Common Causes
35%
Open circuit in sensor signal or ground wire
30%
Failed barometric pressure sensor with internal open circuit
20%
Corroded or loose sensor connector causing high resistance
10%
Damaged sensor ground circuit or poor PCM ground
5%
5-volt reference circuit shorted to battery voltage
Diagnostic Steps
1
Step 1: With sensor connected, backprobe sensor connector and measure signal voltage (should vary with atmospheric pressure, typically 3.5-4.5V)
2
Step 2: Disconnect sensor and check for 5V reference at connector from PCM
3
Step 3: Check sensor ground circuit continuity and verify less than 0.5 ohms resistance to battery negative
4
Step 4: Inspect all wiring and connectors for breaks, corrosion, or damage
5
Step 5: Test sensor by applying known pressure or replace with known-good sensor to verify repair
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
The barometric pressure sensor A circuit voltage is reading higher than expected. This indicates the sensor is reporting abnormally high atmospheric pressure or has an electrical circuit fault.
The most common cause of P2229 (Barometric Pressure Sensor "A" Circuit High) is: Open circuit in sensor signal or ground wire
Typical repair costs for P2229 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 lean, experience hesitation, and show reduced power. May cause engine ping or knock under load.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2229 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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