P2227
Barometric Pressure Sensor A Circuit Range/Performance
The engine computer is getting a barometric pressure reading that does not make sense. This can be caused by a bad sensor, wiring problem, or a blocked or faulty hose if the sensor uses one. It can affect fueling, starting, idle, and power.
- SEV
- 3/5
- DRIVE
- CAUTION
- DIY
- $20–$120
- SHOP
- $120–$350
Quick answer
AI-CITATION READYWhat it means
Can you drive with it?
Most common causes
- Faulty barometric pressure sensor
- Damaged, corroded, or loose sensor connector
- Open, shorted, or high-resistance wiring in the sensor circuit
Typical repair cost
DIY usually runs $20–$120. Typical shop repair lands around $120–$350, depending on the root cause.
01 / Definition
P2227 sets when the PCM detects that the barometric pressure sensor A signal is out of the expected range or does not behave as it should under current conditions. On some vehicles, barometric pressure is read directly by a dedicated sensor, while on others it may be calculated from the MAP sensor and ignition key-on data. A failed sensor, damaged wiring, poor connector contact, vacuum leak, or intake restriction can cause this code.
02 / Drive status
With caution. You may be able to drive short distances, but the engine may run poorly or stall. Fix it soon, especially if you notice rough running, loss of power, or hard starting.
03 / Symptoms
- Check Engine Light
- hard starting
- rough idle
- reduced engine power
- poor fuel economy
- hesitation or bogging
- stalling in some cases
- incorrect transmission shifting on some vehicles
04 / Causes
| 1 | Faulty barometric pressure sensor | high |
|---|---|---|
| 2 | Damaged, corroded, or loose sensor connector | high |
| 3 | Open, shorted, or high-resistance wiring in the sensor circuit | high |
| 4 | Contaminated, damaged, or disconnected vacuum hose or port on vehicles that use a hose-fed sensor | medium |
| 5 | Faulty MAP sensor or intake pressure reading causing incorrect barometric calculation | medium |
| 6 | Intake air restriction or severe engine airflow issue affecting pressure readings | low |
| 7 | PCM software issue or internal PCM fault | low |
05 / Diagnostic sequence
- 01Check for related codes such as MAP, MAF, or throttle-related codes.
- 02Inspect the barometric pressure sensor and connector for damage, corrosion, loose pins, or water intrusion.
- 03Verify the sensor power, ground, and signal wiring with a multimeter.
- 04Compare live barometric pressure data to local atmospheric pressure and key-on engine-off readings.
- 05Inspect any vacuum hose or port attached to the sensor for cracks, blockage, or disconnection.
- 06Check intake ducts, air filter, and sensors for contamination or restriction.
- 07If wiring and sensor checks are good, test the PCM inputs and software updates per service information.
06 / Repairs
| 1 | Clean and secure the sensor connector, repair damaged terminals, and clear codes. | $0–$40 |
|---|---|---|
| 2 | Repair or replace damaged wiring or vacuum hose/line to the sensor. | $20–$150 |
| 3 | Replace the barometric pressure sensor if readings are out of range or inconsistent. | $30–$120 |
| 4 | Repair related MAP/intake air issues or replace a faulty related sensor if diagnostics point there. | $50–$250 |
| 5 | Update PCM software or diagnose PCM fault if all other checks pass. | $0–$300 |
07 / Related codes
08 / FAQ
Can a bad barometric pressure sensor cause hard starting?
Yes. Incorrect barometric pressure data can lead to poor fuel and air calculations, which can make starting difficult.
Will clearing the code fix P2227?
Only temporarily if the underlying problem is still present. The code will usually return until the sensor, wiring, or related issue is fixed.
Is P2227 the same as a MAP sensor code?
No. P2227 is specifically for the barometric pressure sensor circuit range or performance, but MAP sensor problems can sometimes trigger it.
Do I need to replace the PCM first?
No. PCM failure is uncommon. Always check the sensor, connector, wiring, and related intake pressure signals first.
09 / Source and method
- DATA BASIS
- OBD-II REFERENCE + OBD2.HELP
- METHOD
- STATIC VALIDATION
- SAFETY
- INFORMATIONAL
This page combines OBD-II diagnostic reference data with OBD2.help generated diagnostic guidance for code meaning, likely causes, and repair direction.
Publishing uses deterministic schema and build validation, plus manual spot checks on representative pages before release.
Safety-critical diagnosis and repairs should be confirmed with a qualified mechanic, especially when the vehicle is misfiring, overheating, or losing power.