P0411 Fault on 2015 GMC Terrain 2.4L with California Emissions (NU6) - TSB 18-NA-061 Guidance
I'm experiencing a P0411 diagnostic trouble code on my 2015 GMC Terrain equipped with a 2.4L 4-cylinder engine and registered under California emissions standards (NU6). Any insights or solutions available? DTC P0411 indicates an incorrect air flow detected in the secondary air injection system, which is controlled by the Powertrain Control Module (PCM). The issue may be related to cold climate conditions or low-quality fuel, as referenced in TSB 18-NA-061. The emissions warranty on this vehicle typically extends beyond the standard manufacturer warranty. I have no other diagnostic codes present at this time. Could you advise whether there are any specific repair procedures or dealer recommendations for addressing this P0411 code?
A Technical Service Bulletin (TSB) exists — TSB 18-NA-061 — specifically addressing cold climate conditions and fuel quality issues. This may apply to your situation. DTC P0411: Secondary Air Injection System Detected Incorrect Air Flow. The system is controlled by the PCM, with both high-side and low-side (power and ground) circuits that should be checked if no other codes are present. I recommend contacting your dealer for a proper diagnosis and repair, as the emissions warranty may cover this issue under extended coverage. Please confirm whether any additional diagnostic trouble codes are active.