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I had two used tires put on the front of my 2000olds bravada and now the service awd light is on,did they mess something up.

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This is not a good practice. The tyres are obvious different sizes to the rear tyres either in construction ( example 185 95/15 as to the rear sizes 185 50/15-- the difference of 45 means that the circumference is smaller and therefore travels less distance for the same revolutions. ) or they have less tread left on them than the rear tyres which means that the distance they travel per revolution will be greater or less than the rear tyres. This variation means that the diff between from and rear drives is now turning and the sensor is picking that movement up and displaying as the service light The only difference allowable when fitting different tyres is the tread pattern and even then both wheels on the same end have to be the same tread pattern.. When using second hand used tyres you have to be very careful in selection as any old thing will cause you grief. I would say that it is not what they did but what you selected for the job.

Posted on Nov 23, 2014


If the tire diameter is different from the rear

Used tires will be worn & smaller

If that is AWD--- it won't work,need 4 tires the same

Same brand,same tread,same amount of wear (dia)

They also could have caused a problem with sloppy work

Posted on Nov 23, 2014


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SOURCE: 2004 olds bravada lock in awd and dont shift out

Encoder motor might be bad.

Posted on Jul 27, 2009

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SOURCE: Service AWd light is on on my 98 olds bravada

i got a 98 bravada and my AWD light was on, what i did to fix it was replace the transfer case motor and thats all, i did a bunch of research and found out that the transfer case motor is the main conponent with of your AWD it tells the transfer case when to give the front wheels power. try replacing that

Posted on Sep 17, 2009

  • 3854 Answers

SOURCE: I have a 2000 bravada and the awd doesn't isn't

I'm pretty sure the computer controlled NP-136 transfer case (which uses two speed sensors to sense the difference in speed between the front output shaft and the rear output shaft, and engages the front axle accordingly) was installed in 1998 and later models.

These trucks (mine included) use an "Active On Demand" transfer case. Basically its a normal 4x4 transfer case with a big electrically actuated (by way of a motor) clutch that connects the front prop-shaft (which is being spun by the wheels full time) to the transfer case front output. Its all in the transfer case.

Good luck and hope this help, check all the fuses and the wire harness to the encoder motor and replace the encoder motor if it has gone bad. Try bring it to a transmission shop that is familiar with the AWD system on your Bravada. The earlier years were a different system, 1998 was when the change was made. 1997 and earlier use the Borg-Warner 4472, which is always engaged with the use of the viscous coupling. Both were marketed as "SmartTrak" though.

Sounds to me like the transfer case actuator motor is either faulty or it is being told to be on all the time (which it shouldn't be).

Posted on Dec 15, 2009

  • 41 Answers

SOURCE: AWD on 2K Bravada not working. Service AWD light

Probably encoder motor on transfer case. Try "thepartsladi" store on Ebay for low price OEM motor.

Posted on Feb 06, 2010

  • 7 Answers

SOURCE: I just bought a 02 Bravada yesterday and on the

bravadas are bad for encoder motors check your atc fuse under the hood first though (automatictransfercase)

Posted on May 24, 2010

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1 Answer

Is there a switch for the awd on 98 olds bravada

There is no switch, If the light is on there is a problem with your system. The most common issue is someone installing mix-matched tire sizes or running with a low tire. This eats up the coupler in the transfer case.

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They shoul kick in when you have slip. If they do not then you may be having a malfunction in the system.

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2000 Oldsmobile Bravada AC backfeeding to mess up the AWD upon next start up.

Go to and register your car for free wiring diagrams and fusebox layouts. Another site is for the same things.

Look at the wiring and fusebox layouts and see if there is any common connection between the A/C wiring and the AWD light.

I can tell you when it comes to shifting from normal to all wheel drive in Ford systems, they use a single wire that carries different voltages. The difference is so slight, that having a burned out dash light can change the transfer case from 2 wheel to 4 wheel drive, just because the voltage is bypassing a burned out bulb. Should your A/C and AWD work in a similar method it would explain what is happening to you.

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Now you may want to start by replacing Relays. Because someone was right when this was mentioned. Most people do not know that there are more than 1 set of contacts inside of a relay. Many times half of the Relay may be stuck on, and not release when the control is shut off. This allows for some weird power connections.

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1 Answer

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Nov 21, 2011 | 2000 Oldsmobile Bravada

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AWD service light io on all wheel not working

Probably a bad transfer case encoder motor. Common problem on Bravadas. Also make sure your transfer case uses only "blue" GM Auto Trac II fluid. Flush once after driving a week with "blue" if you don't find "blue" fluid when origianlly checking. Just temporarily plugging a new encoder motor to harness should get the light to go out. Other less likely problem could be bad AWD control module or fuse.

Jan 08, 2010 | 1998 Oldsmobile Bravada

1 Answer

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Tires different sizes and/or encoder motor on transfer case bad? Could be speed sensors if your tires all match.

Oct 26, 2009 | 2002 Oldsmobile Bravada

1 Answer

My poor olds!!

Possibly different tires sizes or bad speed sensors combined with a bad transfer case encoder motor? Try "thepartsladi" eBay store if you have to buy the encoder motor, beware aftermarket parts on Bravada!

Oct 04, 2009 | 2000 Oldsmobile Bravada

2 Answers

2000 oldsmobile bravada all wheel drive light comes on stays on

your problem is more than likely one of a few problems
there are two hoses on your transfer case one sucks in one blows out if one gets cloged it will go out completly so have it checked its starting.
or check the oil in the transfer case

Mar 27, 2009 | 2004 Oldsmobile Bravada

1 Answer

Service AWd light is on on my 98 olds bravada

i got a 98 bravada and my AWD light was on, what i did to fix it was replace the transfer case motor and thats all, i did a bunch of research and found out that the transfer case motor is the main conponent with of your AWD it tells the transfer case when to give the front wheels power. try replacing that

Mar 16, 2009 | 2000 Oldsmobile Bravada

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