Conditions for Setting the DTC

WARNING: This page is about a different car, the 2021 GMC Terrain. However, it is still accessible from the selected car via links, so may be relevant.

P0721

Output Speed Sensor = Greater than 20 RPM - For 3.5 s

P0722

Output Speed Sensor = Less than 25 RPM Increase Forward & Reverse Gear

P0723

Output Speed Sensor = Greater than 500 RPM Decrease - For 1.5 s

P077C

Output Speed Sensor = Less than 0.25 V - Signal circuit - For 1 s

P077D

Output Speed Sensor = Greater than 4.75 V - Signal circuit - For 1 s

P172A

Output Speed Sensor = Reverse Gear & Gear Status = Forward Gear - For 2.5 s