20 Most Recent 2008 Chevrolet Tahoe Questions & Answers

Question edited for a lot more clarity. Question moved to model category. What did you use to check the code, a simple scan tool, the dash display? A professional grade scan tool computer will tell you exactly which component is causing the number 4 misfire. https://www.google.com/search?q=auto+electrician+near+me ..

check air pressure if you add air drive for about 15 minutes replace pressure sensor located inside tire or i would ignore it.

Should be attached to the top of the transmission tunnel under the center console, if I remember correctly.

Bad flapper door actuator, or leaking vacuum line.

First thing I would do is rig a vacuum cleaner hose that will go deep into the defrost vents... cut the defrost on HIGH - WIDE OPEN - FAN ON HIGH!! -- then stick the hose down and dig around.. you will find you have collected a LOT of farm "dust" (down)(the way dust falls) in the defrost vents.. and the A/C vents are not (down) and nothing falls (down into) the vents...

You got the wrong alternator.

Do you know anything about automotive electrical testing ? Do you know what it takes for your vehicle to start ? When you trun the key to start what happens ? The electronic's involved ? The ignition switch is a input to the BCM - body control module . When the key is turned to the start position the BCM see's that an then sends a coded message to the ECM - engine computer.over the serial data bus or network ! which will then energize the starter relay , located in the under hood fuse box . This will only happen if the ECM see's the input from the transmission range sensor , telling the PCM the vehicle is in park or neutral. an there isn't any problem with the anti- theft system . Plus all the other basic problems that can cause a no crank no start condition . Battery , battery connections , battery cables etc... Low Voltage will cause warning lights to come on , telling the driver those systems are disabled . The best thing you could do , have a qualified repair shop hook up a professional scan tool an check for DTC'S . Circuit Description (Key Start) When the ignition switch is placed in the Start position, a discrete 12-volt signal is supplied to the body control module (BCM) notifying it that the ignition is in the Start position. The BCM then sends a message to the engine control module (ECM) notifying it that CRANK has been requested. The ECM verifies that the transmission is in Park or Neutral. If it is, the ECM then supplies 12 volts to the control circuit of the STRTR relay. When this occurs, battery positive voltage is supplied through the switch side of the STRTR relay to terminal S of the starter solenoid. Also if the charging system was not working properly the Computers on the vehicle would shut thing's down if the BCM see's low output from the alternator . Electrical Power Management The electrical power management (EPM) is used to monitor and control the charging system and alert the driver of possible problems within the charging system. The EPM system makes the most efficient use of the generator output, improves the battery state of charge (SOC), extends battery life. The idle boost operation is a means of improving generator performance during a low voltage or low battery SOC condition. Idle boost is activated in incremental steps, idle boost 1 must be active before idle boost 2 can be active. The criteria used by the body control module (BCM) to regulate EPM are outlined below.

If you can hear the motor when you try to operate the window then it'll be a problem with your window regulator (the mechanism that moves the window up an down), if you can't hear the motor then It's more likely to be a fault with the motor as you said it wouldn't work with the central locking. This means your car has a total closure system, ie you press a button and all windows and sunroof close. These systems are usually seperate wiring from the switched circuit used to operate the windows from inside the car, so, if the windows don't work on either circuit then the one thing they do have in common is the motor. myLightSmile

It's not reading the chip,in the key,,,,,get new ignition switch with key,,,

go to grage and setup

that question has been asked by thousands of people,, you cant disable it ,,, it part of the cpu of the auto,, only thing you can do is pull the dash and remove the bulb,, but it will still pop up in your message display,,, best think to do is get it in working order

PO 446 Evap System Vent Solenoid issue Nothing to do with the canister Have to test parts & only replace those that fail Smoke the system & test all the evap components Scan tool data may help Google your codes Type: OBD PO446

First, check fuses. Do none of the doors turn on lights? could be bad light switch.

TCM is Inside the PCM

It will be necessary to remove both front seats before removing the console. The console mounts are located UNDER the seat mounts. 4 bolts hold the seats down and don't forget to unplug the wiring to the seats before removing.

I DID THIS ON MY CADILLAC GOT REPLACEMENT KEY FROM DEALER

The noise could be due to worn out rear struts( shock absorbers). Have the vehicle looked at at sears, or midas, firestone, etc, and ask to have the rear end checked.