The code C0040 is related to the right front wheel speed sensor there is a fault from either obstruction on the sensor to detection ring(ie debris on sensor or ring surface) or it can be a bad sensor in need of replacement.
Trouble code P0446 means:Evaporative emission control system vent control circuit malfunction
Trouble code P0506 means:Idle control system RPM lower than expected
The 2006 GMC Yukon has 16 valves.
The 2006 GMC Savana has 12 valves.
The 2006 GMC Canyon has 16 valves.
The 2006 GMC Yukon has a V8 engine.
The 2006 GMC Savana has a V6 engine.
The 2006 GMC Savana is a gas-powered vehicle.
The 2006 GMC Yukon has overhead valves (OHV).
The 2006 GMC Canyon has an inline 4 engine.
The 2006 GMC Savana has a 4-speed automatic.
The 2006 GMC Yukon is a gas-powered vehicle.