P227C 2015 GMC Sierra Code - Barometric Pressure Sensor 2 Circuit Low Voltage
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
- P227C 2015 GMC Sierra indicates Barometric Pressure Sensor 2 Circuit Low Voltage.
- 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.
Code P227C 2015 GMC Sierra Description
- 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 44 kPa (6.4 PSI) for greater than 5 s.
What are the Possible Causes of the DTC P227C 2015 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 P227C 2015 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 P227C 2015 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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Frequently Asked Questions about P227C 2015 GMC Sierra Code
1. What does the OBDII code P227C mean on a 2015 GMC Sierra?
The P227C code indicates "Barometric Pressure Sensor 2 Circuit Low Voltage," meaning the sensor is reporting a voltage lower than the expected range.
2. What are the common symptoms of code P227C on a 2015 GMC Sierra?
Symptoms may include poor engine performance, reduced fuel efficiency, difficulty starting the engine, or the check engine light being illuminated.
3. What causes the P227C code to appear?
Common causes include a faulty barometric pressure sensor, damaged or corroded wiring, a loose connector, or issues with the engine control module (ECM).
4. How do I diagnose the P227C code on my GMC Sierra?
Start by inspecting the barometric pressure sensor, its wiring, and connectors for damage or corrosion. Use a multimeter to verify voltage and continuity, and compare sensor readings with a scan tool.
5. Can a dirty air filter trigger the P227C code?
No, a dirty air filter is unlikely to cause this specific code since it relates to the barometric pressure sensor, not airflow.
6. Is it safe to drive with a P227C code on my 2015 GMC Sierra?
While the vehicle may still be drivable, ignoring the issue can lead to poor engine performance and potential damage to other components. It’s best to address it promptly.
7. How do you fix the P227C code on a GMC Sierra?
Repairs may involve replacing the barometric pressure sensor, repairing wiring or connectors, or reprogramming/updating the ECM if necessary.
8. How much does it cost to fix a P227C code on a 2015 GMC Sierra?
The cost depends on the repair required. Replacing the barometric pressure sensor typically costs $100–$300, including parts and labor.
9. Can a weak battery cause the P227C code to appear?
Yes, a weak or failing battery can cause voltage irregularities that may trigger this code. Always check battery health during diagnosis.
10. Does the P227C code require ECM replacement?
ECM replacement is rarely needed for this code. Only consider it if all other causes, such as the sensor and wiring, have been ruled out and the ECM is confirmed to be faulty.
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