When your 2019 GMC Sierra's remote start feature stops working, the truck isn't recognizing the command or specific conditions are preventing the system from activating. Understanding the various interlocks and requirements helps restore this convenient feature.
How GM Remote Start Works
The 2019 Sierra's remote start uses the key fob to send a start command to the vehicle. Press lock, then press and hold the remote start button. The vehicle verifies the signal, checks that all starting conditions are met, and then starts the engine for a predetermined time (usually 10-15 minutes) before automatically shutting off.
Conditions That Disable Remote Start
GM's system has numerous interlocks that prevent remote start: hood open or ajar, check engine light illuminated, low fuel level, doors not fully closed, key left in ignition, transmission not in Park, recent emissions fault, or previous remote start attempts that failed. Any active fault code typically disables the feature.
Key Fob and Battery Issues
The key fob must have adequate battery power to transmit the remote start signal. Unlike door lock commands, remote start requires a longer, more complex transmission. A fob with a weak battery may lock doors but fail to transmit the full start command. Replace the CR2032 battery if remote start is unreliable.
Range and Interference
Remote start range is affected by obstacles, buildings, and interference. The 2019 Sierra's stated range varies by equipment level, but real-world range is often less. Try moving closer to the vehicle. Physical objects between you and the truck, other radio signals, and even weather conditions affect range.
Check Engine Light Effect
A persistent check engine light disables remote start as a safety measure. Even minor codes that don't affect driveability will disable the feature. Have codes read and cleared - once the underlying issue is fixed and the light is off, remote start should function again.
Hood Pin Switch
The hood must be fully closed for remote start to work. A misaligned hood or failed hood ajar switch makes the system think the hood is open. Check the hood pin switch located at the front of the engine compartment - it may need adjustment or replacement if corroded.