AutoCodes – GMC – P227B 2017 GMC Sierra

P227B 2017 GMC Sierra Code - Barometric Pressure Sensor 2 Performance

Quick Answer

The Barometric Pressure (BARO) Sensor 2, also referred to as the Turbocharger Inlet Air Pressure (TCIAP) sensor, is integral to the Multifunction Intake Air Sensor and is used for humidity sensor signal correction. Common causes include Faulty Multifunction Intake Air Sensor, Multifunction Intake Air Sensor harness is open or shorted, Multifunction Intake Air Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P227B 2017 GMC Sierra indicates Barometric Pressure Sensor 2 Performance.
Common causes: Common causes include Faulty Multifunction Intake Air Sensor, Multifunction Intake Air Sensor harness is open or shorted, Multifunction Intake Air Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 211

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Oct 01, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P227B 2017 GMC Sierra Description

The Barometric Pressure (BARO) Sensor 2, also referred to as the Turbocharger Inlet Air Pressure (TCIAP) sensor, is integral to the Multifunction Intake Air Sensor and is used for humidity sensor signal correction. The sensor responds to changes in altitude and atmospheric conditions and gives the Engine Control Module (ECM) an indication of intake air pressure relative to humidity. The ECM provides a 5 V reference and signal circuits to the TCIAP which shares a low reference circuit with IAT 1 and 2. Ignition voltage and ground circuits are also supplied to the Multifunction Intake Air Sensor internal circuits for these sensors:
- Intake Air Temperature (IAT) Sensor 1
- IAT Sensor 2
- Humidity Sensor
- Mass Air Flow (MAF) Sensor
- Turbocharger Inlet Air Pressure (TCIAP) Sensor (BARO 2)
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the BARO sensor pressure is less than 50 kPa (7.3 PSI) or greater than 115 kPa (16.7 PSI), for greater than 62.5 ms.

OBDII Code P227B 2017 GMC Sierra - Barometric Pressure Sensor 2 Performance - AutoCodes.com — P227B 2017 GMC Sierra Code - Barometric Pressure Sensor 2 Performance

What does this mean?

What are the Possible Causes of the DTC P227B 2017 GMC Sierra?

Faulty Multifunction Intake Air Sensor
Multifunction Intake Air Sensor harness is open or shorted
Multifunction Intake Air Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P227B 2017 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P227B 2017 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P227B 2017 GMC Sierra Code

1. What does the OBDII code P227B mean for a 2017 GMC Sierra?

Code P227B indicates a performance issue with Barometric Pressure Sensor 2, meaning the sensor is not functioning within its expected range.

2. What are the common symptoms of a P227B code?

Symptoms may include poor engine performance, reduced fuel efficiency, difficulty starting the engine, and the Check Engine Light turning on.

3. What causes the P227B code to appear?

Common causes include a faulty barometric pressure sensor, wiring or connector issues, a malfunctioning PCM (Powertrain Control Module), or environmental factors like extreme altitude changes.

4. Can a dirty air filter trigger a P227B code?

While unlikely, a severely clogged air filter can potentially affect airflow and pressure readings, exacerbating issues with the barometric pressure sensor.

5. How do you diagnose a P227B code?

Diagnosis typically involves using a scan tool to monitor sensor readings, visually inspecting sensor wiring and connectors, and testing the barometric pressure sensor with a multimeter.

6. Can driving with a P227B code damage my 2017 GMC Sierra?

Prolonged driving with this code may result in poor fuel economy and engine performance, but it is unlikely to cause immediate severe damage.

7. How do you fix a P227B code?

Repairs may include replacing the barometric pressure sensor, repairing damaged wiring or connectors, or reprogramming/updating the PCM.

8. Is the barometric pressure sensor the same as the MAP sensor?

No, the barometric pressure sensor measures atmospheric pressure, while the MAP sensor measures pressure inside the intake manifold.

9. Does altitude affect the barometric pressure sensor?

Yes, extreme altitude changes can momentarily affect sensor readings, but the sensor should adapt quickly. Persistent issues may indicate a malfunction.

10. How much does it cost to fix a P227B code on a 2017 GMC Sierra?

The repair cost depends on the issue. Replacing the sensor typically ranges from $100 to $300, including parts and labor. Wiring repairs or PCM replacements may cost more.