Conditions for Running the DTC

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

P0842 or P0843

DTCs P0751, P0752, P0756, P0757, P0973, P0974, P0977, P1825 or P1915 are not set.
Ignition voltage is 8.6 volts or greater.
The transmission fluid temperature (TFT) is 0-120°C (32-248°F).
Engine speed is 500 RPM or greater for 5 seconds.