Conditions for Running the DTC

WARNING: This page is about a different car, the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

P0787

The system voltage is 8-18 volts.
The engine speed is greater than 475 RPM for 5 seconds.
Vehicle speed is less than 200 km/h (124 mph).

P0788

The system voltage is 8-18 volts
The engine speed is greater than 475 RPM for 5 seconds.
Vehicle speed is less than 200 km/h (124 mph).