P2228 — Barometric Pressure Sensor "A" Circuit Low

What does OBD2 code P2228 mean?

P2228 — Barometric Pressure Sensor "A" Circuit Low. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: poor ground connection, corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit.

What is the most common cause of P2228?

The most common causes are: poor ground connection, corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit.

What are the symptoms of P2228?

Drivers most often notice: Check Engine Light on, increased fuel consumption in some cases, the affected system operates intermittently or not at all, possible limp mode depending on the affected component.

How do I diagnose P2228 myself?

Start with a scan: confirm P2228, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the barometric pressure sensor "A", and verify the suspect component against live data before buying parts.

Will P2228 clear itself?

Sometimes P2228 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.

What does P2228 mean?

Seeing P2228 on your scanner? The control unit has caught the sensor and actuator circuits operating outside its calibrated window. The formal description is “Barometric Pressure Sensor "A" Circuit Low”, and the code is grouped under powertrain (engine/transmission) faults.

“Circuit low” means the voltage on the barometric pressure sensor "A" 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.

This code does not appear from a single bad reading: the module must see the fault condition repeat under defined operating conditions before it turns on the warning light. The freeze frame captured with P2228 — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.

Common symptoms of P2228

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

What causes P2228?

• signal wire shorted to ground (chafed insulation)
• missing supply voltage to the barometric pressure sensor "A"
• failed barometric pressure sensor "A" pulling the signal low
• control module driver fault
• blown fuse feeding the circuit
• poor ground connection
• open or shorted wiring in the circuit

How to diagnose P2228

1. Connect an OBD2 scanner, confirm P2228 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 "A" for damage, corrosion, chafing or poor contact.
4. Check for supply voltage at the barometric pressure sensor "A" 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 P2228 does not return.

How to fix P2228

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

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

How much does it cost to fix P2228?

Repair cost depends on which component actually failed. Typical scenarios for P2228 (parts and labor, USD, independent shop rates):

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

Overall, fixing P2228 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 P2228?

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