P2431 GMC Code - Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance Bank 1
Quick Answer
The Secondary Air Injection (AIR) System aids in the reduction of hydrocarbon exhaust emissions during a cold start-up. Common causes include Faulty AIR Pressure Sensor, AIR Pressure Sensor harness is open or shorted, AIR Pressure 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
- P2431 GMC indicates Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance Bank 1.
- Common causes
- Common causes include Faulty AIR Pressure Sensor, AIR Pressure Sensor harness is open or shorted, AIR Pressure 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 P2431 GMC Description
The Powertrain Control Module (PCM) activates the AIR system by simultaneously supplying grounds to the AIR pump and the AIR valve relays. This action closes the relays' internal contacts. The AIR pump and the AIR control solenoid valve/pressure sensor assembly are in turn energized, the pump runs and the control/shut-off valve opens.
The AIR pump sends pressurized fresh air into the pipes/hoses through the open control/shut-off valve, and into the exhaust manifold. The extra air accelerates the catalyst operation, helping it to reach operating temperature faster. The AIR pump remains ON for a short period of time after the control/shut-off valve is commanded OFF. When the AIR pump is commanded OFF it will not run or be activated until the next vehicle start. When the AIR system is inactive, the closed AIR control/shut-off valve prevents air/exhaust flow in either direction.
The AIR system pressure sensor is used to monitor pressure at the AIR control solenoid valve/pressure sensor assembly inlet during the commanded ON/OFF states.
What are the Possible Causes of the DTC P2431 GMC?
- Faulty AIR Pressure Sensor
- AIR Pressure Sensor harness is open or shorted
- AIR Pressure Sensor circuit poor electrical connection
How to Fix the DTC P2431 GMC?
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 P2431 GMC 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 P2431 GMC Code
What does the OBDII code P2431 mean on a GMC?
Code P2431 indicates an issue with the secondary air injection system air flow/pressure sensor circuit on Bank 1, suggesting the sensor is reporting values outside the expected range.
What are the symptoms of a P2431 code on a GMC?
Common symptoms include an illuminated check engine light, reduced engine performance, rough idling, and potential difficulty passing emissions tests.
What causes the P2431 code on a GMC?
Possible causes include a faulty air flow/pressure sensor, damaged wiring or connectors, a malfunctioning secondary air injection pump, or blockages in the air injection system.
How is the P2431 code diagnosed on a GMC?
A technician will use a scan tool to confirm the code, inspect the air flow/pressure sensor and related wiring, and check the operation of the secondary air injection system for blockages or pump failure.
Can I drive my GMC with a P2431 code?
While it may be possible to drive with this code, it is not recommended as it can lead to decreased performance and failure to meet emissions standards.
How do I fix the P2431 code on my GMC?
Repairs may include replacing the air flow/pressure sensor, repairing damaged wiring or connectors, cleaning blockages in the air injection system, or replacing a faulty air injection pump.
What tools are required to fix a P2431 code on a GMC?
You may need an OBDII scan tool, a multimeter for testing electrical connections, and basic hand tools to replace components or clear blockages.
How much does it cost to fix a P2431 code on a GMC?
The cost varies depending on the root cause but can range from $100 to $400, including parts and labor, for common repairs like sensor replacement or wiring fixes.
Can a dirty air filter cause a P2431 code on a GMC?
No, a dirty air filter typically does not cause this code, as it is specific to the secondary air injection system, not the primary intake system.
How can I prevent the P2431 code from returning on my GMC?
Regular maintenance, including inspecting the secondary air injection system and keeping sensors and connectors clean and in good condition, can help prevent this code.
Discuss the causes and fixes for P2431 GMC OBDII Code
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