What Does P222A Mean?
The barometric pressure sensor B circuit has an electrical malfunction. This is the secondary barometric pressure sensor used for redundancy or monitoring in dual-sensor systems.
Common Causes
40%
Failed secondary barometric pressure sensor
25%
Open or short in sensor B wiring harness
20%
Corroded or damaged sensor B connector
10%
Loss of sensor reference voltage or ground
5%
PCM internal circuit failure for sensor B input
Diagnostic Steps
1
Step 1: Locate secondary barometric pressure sensor B (location varies by manufacturer)
2
Step 2: Inspect sensor B connector for damage, corrosion, bent pins, or moisture
3
Step 3: Measure 5-volt reference supply to sensor B with key on, engine off
4
Step 4: Check sensor B signal voltage and ground circuit integrity
5
Step 5: Compare sensor B readings to sensor A readings - they should be within 0.5 kPa of each other
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
The barometric pressure sensor B circuit has an electrical malfunction. This is the secondary barometric pressure sensor used for redundancy or monitoring in dual-sensor systems.
The most common cause of P222A (Barometric Pressure Sensor "B" Circuit) is: Failed secondary barometric pressure sensor
Typical repair costs for P222A range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive as primary sensor likely still functions. May experience reduced performance accuracy and potential limp mode in some vehicles requiring sensor redundancy.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P222A 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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