Conditions for Running the DTC

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0851

Ignition voltage is between 11-18 volts.
The ignition is ON.
DTC P0852 is not active.

DTC P0852

Ignition voltage is between 11-18 volts.
Ignition is ON.
DTC P0851 is not active.
No GMLAN error messages.
Engine speed is more than 650 RPM.
Actual engine torque is more than 120 N.m (89 lb ft).
Accelerator pedal position is more than 6 percent.
Vehicle speed is more than 24 km/h (15 mph).