P222C — Barometric Pressure Sensor "B" Circuit Low

What is the most common cause of P222C?

The most common causes are: corroded, loose or damaged connector, control module driver fault, blown fuse feeding the circuit.

Will P222C clear itself?

Sometimes P222C clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

How much does it cost to fix P222C?

Replace the faulty sensor or actuator — $150–$500; Control module repair — $300–$1,000; Repair wiring or connectors — $80–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

Is it safe to drive with P222C?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

What does OBD2 code P222C mean?

P222C — Barometric Pressure Sensor "B" Circuit Low. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: corroded, loose or damaged connector, control module driver fault, blown fuse feeding the circuit.

What does P222C mean?

P222C is logged by the onboard diagnostics when the sensor and actuator circuits does not behave as expected. The official definition is “Barometric Pressure Sensor "B" Circuit Low”. This is a powertrain (engine/transmission) category code.

“Circuit low” means the voltage on the barometric pressure sensor "B" circuit stays below the expected minimum — close to ground. The usual physical reasons are a short to ground, a chafed wire touching metal, a missing supply voltage, or a failed component dragging the signal down.

The module monitors this system continuously while driving. When readings fall outside the expected range for a defined number of drive cycles, it stores P222C and switches on the warning light. Freeze frame data saved with the code shows the exact conditions — rpm, load, temperature, speed — at the moment the fault was detected, which is the best starting point for diagnosis.

Common symptoms of P222C

• possible limp mode depending on the affected component
• the affected system operates intermittently or not at all
• increased fuel consumption in some cases
• Check Engine Light on

What causes P222C?

• signal wire shorted to ground (chafed insulation)
• missing supply voltage to the barometric pressure sensor "B"
• failed barometric pressure sensor "B" pulling the signal low
• faulty sensor or actuator of the affected circuit
• corroded, loose or damaged connector
• control module driver fault
• open or shorted wiring in the circuit
• blown fuse feeding the circuit
• poor ground connection

How to diagnose P222C

1. Connect an OBD2 scanner, confirm P222C is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
2. Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
3. Visually inspect the wiring harness and connectors related to the barometric pressure sensor "B" for damage, corrosion, chafing or poor contact.
4. Check for supply voltage at the barometric pressure sensor "B" connector first; then measure resistance from the signal wire to ground — near-zero ohms confirms a short to ground in the harness.
5. Measure reference voltage, ground and signal continuity at the component connector.
6. Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
7. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P222C does not return.

How to fix P222C

Start with the cheapest and most common causes before replacing expensive parts:

• Replace the faulty sensor or actuator — $150–$500
• Control module repair — $300–$1,000
• Repair wiring or connectors — $80–$250

How much does it cost to fix P222C?

Repair cost depends on which component actually failed. Typical scenarios for P222C (parts and labor, USD, independent shop rates):

• Replace the faulty sensor or actuator: $150–$500
• Control module repair: $300–$1,000
• Repair wiring or connectors: $80–$250

Overall, fixing P222C usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P222C?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

Related OBD2 codes

• P2200: NOx Sensor Circuit Bank 1
• P2201: NOx Sensor Circuit Range/Performance Bank 1
• P2202: NOx Sensor Circuit Low Bank 1
• P2203: NOx Sensor Circuit High Bank 1
• P2204: NOx Sensor Circuit Intermittent Bank 1
• P2205: NOx Sensor Heater Control Circuit/Open Bank 1