AutoCodes - Gmc - P0411 GMC

P0411 GMC Code - Secondary Air Injection System Insufficient Flow

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3
Table of contents

|P0411 GMC code possible causes

  • Vacuum hoses damaged or pinched
  • Faulty Air Pump inoperative
  • Faulty Air Pump harness is open or shorted
  • Faulty Air Pump circuit poor electrical connection

|How do I fix the P0411 GMC code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|Cost of diagnosing the P0411 GMC code

Labor: 1.0

The cost of diagnosing the P0411 GMC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0411 GMC code detected?

The AIR system does not meet the expected flow rate during testing

|What are P0411 GMC code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine hesitation

|P0411 GMC code description

The Secondary Air Injection (AIR) System aids in the reduction of hydrocarbon exhaust emissions during a cold start-up. This occurs when the start-up engine coolant temperature (ECT) is between 5-50°C (41-122°F), and the intake air temperature (IAT) is between 5-60°C (41-140°F). The AIR pump operates 5-60 seconds after start-up.
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.
OBDII Code P0411 Gmc - Secondary Air Injection System Insufficient Flow - AutoCodes.com

|Need more information with the P0411 GMC code?

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|Need help with a P0411 GMC code?

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|P0411 GMC code comments

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Repair Importance Level: 2
 
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