What Does P222C Mean?
The barometric pressure sensor 'B' is reporting a voltage signal that is below the expected minimum threshold. This indicates either a short to ground, faulty sensor, or wiring issue causing insufficient voltage to reach the PCM.
Common Causes
35%
Shorted or damaged wiring in BARO sensor B circuit
30%
Failed barometric pressure sensor B
20%
Corroded or damaged sensor connector
10%
Short to ground in sensor signal wire
5%
PCM internal fault on BARO B circuit
Diagnostic Steps
1
Step 1: Visually inspect BARO sensor B connector for corrosion, bent pins, or damage
2
Step 2: Measure voltage at sensor B signal wire with key on, engine off (should be around 5V reference)
3
Step 3: Check resistance between signal wire and ground (should be high resistance/open circuit)
4
Step 4: Backprobe sensor output voltage and compare to specifications (typically 3-5V at sea level)
5
Step 5: If wiring is intact, replace BARO sensor B and retest
Estimated Repair Cost
$100 - $350
Parts + labor, varies by vehicle and location
The barometric pressure sensor 'B' is reporting a voltage signal that is below the expected minimum threshold. This indicates either a short to ground, faulty sensor, or wiring issue causing insufficient voltage to reach the PCM.
The most common cause of P222C (Barometric Pressure Sensor "B" Circuit Low) is: Shorted or damaged wiring in BARO sensor B circuit
Typical repair costs for P222C range from $100 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may run poorly at different altitudes and experience reduced fuel economy. Generally safe to drive but may fail emissions testing.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P222C to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Management / Fuel Delivery
Difficulty
Type
Generic (SAE)
Recommended Tools
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