20 Most Recent 2009 GMC Yukon XL - Page 7 Questions & Answers

You need to have the fuel vapor recovery system tested as well as the system for fault codes.

Generic Code --not GMPO-446 Evap Control System Vent Circuit Malfunction

You'll need to check the circuit from the fuel pump relay back to the pump. The computer grounds the relay.If the pump is running the filter could be clogged.

There is no ignition sensor.You will have to have someone diagnose the ignition system to find out where the problem is.

These are OBD2 electronic engine control fault codes and are not parts. The mechanic pulling your leg and having fun at your expense.

All of these codes have to deal with a lost communication with the IPC- or instrument panel cluster, When this happens the vehicle thinks it is being stolen and goes into lock down mode, unfortunatly the only way to resolve this is to have it towed to a local GM dealer so that they can reset the theft system , I hate to be the one to bring bad news, but this one just can not be solved without sofisticated equipment involved.

Several TSB's about this associated with other codes.

Hope this help.

Instructions:1 Disconnect the trucks negative battery cable.

2 Unhook the clip for the door's manual window crank with a hooked tool behind the handle (or rub a rag behind the handle), or for a power window, pry off the window switch assembly from the door handle with a trim stick and disconnect its electrical connector.

3 Pry off all small panels and bezels on or near the door with the trim stick, including the triangular panel on the mirror mount and the bezel surrounding the door handle.

4 Unscrew and remove all of the mounting screws for the door's inner trim panel then pull the panel out to detach the clips. Disconnect all remaining electrical connectors on the door panel.

5 Peel off the plastic water deflector sheet from the door.

6 Press down on the speaker's upper mounting tab while grasping the speaker, then tilt the speaker out of the door frame and lift it off the tabs on the bottom. Disconnect the speaker's electrical connector.

Connect the replacement speaker to the electrical connector.

8 Secure the speaker to the lower tabs and pivot it into the mounting hole, clipping it in place with the door's mounting tab.

9 Press the plastic shield back into place on the door.

10 Reconnect the trim panel onto the door, connecting all needed electrical connectors and engaging all its clips, then apply its mounting screws. Reconnect all smaller panels and bezels to the panel.

11 Reinstall the window crank or control switch with its clip or electrical connector.

12 Reconnect the black battery cable onto the negative terminal.

HID KITS.

Check your spark plugs and see if they need to be replaced. Check the gap on the spark plug. You may have low compression, timing belt or chain should be checked as well. Check the computer system in your car. Is your check engine light on? Maybe your crank sensor is not working properly. Try these and if not get back to me and we'll try more possibilities.

Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 2 is generally the side of the engine that doesn't have cylinder #1.Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.I hope this helps.