Question about 2004 Oldsmobile Alero

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My Alero has had wheel sensor problem 3x's. My antilock brakes stop working.

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Had same problem go to autozone run obd2 and probably need 34.00 sensor.

Posted on May 26, 2009

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My trac off abs and service vehicle soon lights are all on mechanic said wheel barrings are fine ,,whats the problem and is it safe to drive 425 mile out of town and back?


Probably just a wheel sensor out. It will be fine to drive that far and back. You wont have tracton control or antilock brakes. Meaning that if you slam on the brakes the tire can lock up and skid. When the abs is out it reverts to the old braking system that they used in all vehicles for decades.

Jul 02, 2011 | 2002 Oldsmobile Alero

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My ABS ligth stays on but my brakes work fine.


The ABS system is related to emergency stopping, not normal brake use, where you don't want the tires to lock-up when the brakes are hit very hard. ABS stands for Antilock Brake System. When the ABS light is on, the ABS system is not active. This means the ABS will not be Antilock when you need it. This does not mean you don't have brakes. The brakes you have are normal brakes without the added feature of antilock.

The light is on because a system fault has been detected. Most of the time this is a wheel speed sensor that has failed. Basically the system works by having 4 wheel speed sensors connected to a control unit. The control unit determines how much braking presure each wheel needs according to how much pedal presure you are applying, related to the vehicle speed, and the rotation speed of each wheel. If one wheel is spinning slower than the others that would mean it is locking up (less braking efficientcy) and the control unit then reduces the presure applied to that wheel so it doesn't lock up.

If a wheel speed sensor goes bad the entire system can't function so it shuts down and it is now a regular braking system. This means that it will work and feel fine to you, the operator. But in an emergancy, the ABS will not function and the brakes may lock up which is not as efficient as ABS.

I recommend you get it scanned for codes and find out what is wrong. It is a great safty feature that I think you are better off with, than without.

Some auto parts stores will scan your car for codes for free, like autozone and others. Call around and find that free scan. Then take it to a reputable shop, dealer, or your brother-in-law who is a master mechanic.

Good luck, and be safe!

May 11, 2011 | Ford Taurus Cars & Trucks

1 Answer

My 99 Ford Expedition is experiencing braking issues. Periodically, not all the time, when pressing the brakes to stop, the brakes become very stiff and there is a hard vibration (that feels similar to a...


The symptoms you are describing sound like the brake system is going into antilock mode. If you are driving under wet or slick conditions, this is normal operation and it may not "feel" like it to you, but you are actually stopping in the shortest distance possible for the conditions.

On the other hand...If it is doing this on dry pavement and you are not driving like a maniac, this would be what is commonly called "FALSE antilock mode". This happens when the antilock brake computer "thinks" that one of the wheels is locking up when it is very apparent to the vehicle operator that there is no way a wheel should be locking up or skidding. This ia almost always caused by a weak or defective wheel speed sensor.

I have had a couple of cases on Ford trucks where the front wheel bearings had been changed with aftermarket bearing assemblies and this is when problem either started, or got worse. Upon inspection of the vehicle I found that these new bearing assemblies came with a new wheel speed sensor already installed. For some reason, the manufacturer installed the sensor with a spacer under it??? (like a metal gasket) Removing the sensor and discarding the spacer fixed the vehicles.

Mar 05, 2011 | 1999 Ford Expedition

2 Answers

ABS and OD lights are on and transmission is kicking out could this all be related


Could be a fuse or a wheel speed sensor; next, check the tone rings on the axle shafts and see if they are not broken.

I quote this information from Jeep lover's...

The amber ABS warning lamp is located in the instrument cluster. It is used to inform the driver that the antilock function has been turned off due to a system malfunction. The warning lamp is controlled by the CAB and/or the main relay through an in-harness diode. The CAB controls the lamp by directly grounding the circuit. The main relay grounds the lamp circuit when it is de-energized.
The re BRAKE warning lamp is located in the instrument cluster. It can be activated by application of the parking brake or leak in the front or rear wheel brake hydraulic circuit.
The antilock brake controller (CAB) is a microprocessor-base device that monitors wheel speeds and controls the anttlock function.
The primary functions of the CAB are:
- monitor wheel speeds
- detect wheel locking tendencies
- control fluid pressure modulation to the brakes during antilock stop operation
- monitor the system for proper operation
- provide communication to the DRB while in diagnostic mode
- store diagnostic information in non-volatile memory
The CAB continuously monitors the speed of each wheel. When a wheel locking tendency is detected, the CAB will command the appropriate valve to modulate brake fluid pressure in its hydraulic unit. Brake pedal position is maintained during an antilock stop by being a closed system with the use of 3 accumulators. The CAB continues to control pressure in individual hydraulic circuits until a wheel locking tendency is no longer present. The CAB turns on the pump/motor during an antilock stop.
The antilock brake system is constantly monitored by the CAB for proper operation. If the CAB detects a system malfunction, it can disable the antilock system and turn on the antilock warning lamp. If the antilock function is disabled, the system will revert to standard base brake system operation.
The CAB inputs include the following:
- four wheel speed sensors
- stop lamp switch
- ignition switch
- main relay voltage
- pump/motor relay output
- diagnostic communication ISO/K
- G switch (acceleration switch)
The ABS main relay is located in the power distribution center (PDC). The main relay has two functions. First, when the relay is energized, it supplies power to the valve/solenoids in the valve block assembly and the pump/motor relay coil. Second, when the relay is de-energized, it supplies a ground to turn on the ABS warning lamp. The main relay is controlled by the CAB. The CAB energizes the main relay when it receives an ignition input signal.
The ABS pump/motor relay supplies power to the pump/motor. It is also located in the PDC. The relay coil is powered by the main relay and the coil ground is controlled by the CAB. The pump/motor relay is a special five-terminal relay and should not be replaced with a standard relay.
One wheel speed sensor (WSS) is located at each wheel and sends a small AC signal to the control module (CAB). This voltage is generated by magnetic induction when a toothed sensor ring (tone wheel) passes by a stationary magnetic sensor (wheel speed sensor). The CAB converts the AC signals into digital signals for each wheel.
The front wheel speed sensor air gap is NOT adjustable. The correct front wheel speed sensor air gap is from 0.40mm to 1.3mm. Preferred rear sensor air gap for drum brake systems is 1.1mm. Acceptable air gap range is 0.92mm to 1.275mm. For rear disc brake systems, the preferred rear sensor air gap is 1.2mm. Acceptable air gap range is 0.95mm to 1.45mm. All wheel speed sensors have a resistance between 900 and 1300 ohms.
Correct antilock system operation is dependent on tone wheel speed signals from the wheel speed sensors. The vehicle's wheels and tires should all be inflated to the recommended pressures for optimum system operation. Variations in wheel and tire size or significant variations in inflation pressure can produce inaccurate wheel speed signals; however, the system will continue to function when using the mini-spare. When driven over rough road surfaces, the rear wheel speed sensor signals may be erratic and cause a false trouble code (drum brakes only).
Diagnostic trouble codes are retained in memory until erased using the DRB, or automatically erased after 50 key cycles.
Ensure you are using a DRBIII scan tool properly connected to the data link connector located under the dash to the right of the steering column.
Select "Anti-lock Brakes" the "Teves ABS". Turn the ignition on.
Read and record all ABS diagnostic trouble codes. If the "Valve Power Feed Circuit" trouble code is present, it must be repaired before prior to addressing any other DTCs.
If there are no trouble codes present, select "Inputs/Outputs" and read the brake switch input as you press and release the brake pedal. If the display does not match the state of the pedal, check for 8 volts at the brake lamp switch output circuit. If the voltage is not present, repair the open brake lamp switch output circuit. If the voltage is present, replace the CAB.
If the display does match the state of the pedal, read the "G-Switch" status, with the vehicle on a level surface, both switches should read "CLOSED". If the status is not correct, make sure the G-Switch is properly mounted and connected (under the driver's side rear seat). If it looks correct, you'll have to check for voltage to the G-Switch.

Hope helps.

Jan 18, 2011 | 1995 Jeep Grand Cherokee

1 Answer

My traction control lights keep coming on, and then my car says that the engine power is being decreased, and i'm on dry surface


That is your Antilock Brake/Traction Control computer going into what I call "False antilock mode" This is almost always caused by abad wheel speed sensor. Your vehicle is equipped with 4 of them. To diagnose this problem, you must drive the vehicle with a scanner hooked up that can read the wheel sensor data and find out which wheel sensor is not working properly. Sometimes (but not always) you get lucky and the Antilock Brake Control Module will set a code to tell you which one.

Jan 11, 2011 | Chevrolet Impala Cars & Trucks

2 Answers

Anti lock light , what id mean


The antilock brake system light will go on (ABS) if the sensor in one of the wheels does not detect the correct speed which is essential for the antilock braking system to work properly.

Sep 18, 2010 | 1994 Ford Taurus

1 Answer

Why would my service engine light, trac off light, and anti lock break lights go on at different times when I drive?


well for one the traction and antilock lights are the same sensor. If the anitlock brake sensor goes bad and cannot count your wheel rotations then your traction control system will not work either. AS for the service engine soon light that could be part of this system also or it could be totally different you wont know until you get your code read

Apr 23, 2010 | 2004 Oldsmobile Alero

2 Answers

At times when I apply the brakes, right at the time when the vehicle should be coming to a complete stop, the brakes seem to let up and allow the vehicle to slide up a few feet more.


i would suspect your antilock brakes are activating. you probably have one of your wheel speed sensors that drop to 0 mph fooling the computer that one of the wheels have locked up and therefore goes into antilock mode. no code would set as this is a normal function of antilock brakes, you would need to get a scanner on the car and monitor wheel speed input. as you come to a stop monitor the wheel speeds closely and look to see which one is droppind to 0 prematurly.

Jan 11, 2010 | 1999 Ford Expedition

1 Answer

1995 olds alero; how to repair a brake sensor....car shop


YOU HAVE TO REPLACE WHEEL SENSOR.IF THE BOLT HOLES BROKE.THAT HOLDS IT IN PLACE.NOW IF YOUR WHEEL SENSOR SCREWS MISSING YOU NEED TO BUY THEM AT DEALERSHIP OR SALVAGE YARD.BESURE TO GET SCREWS BEFORE PUTTING A NEW ONE ON.WITH OUT THIS SENSOR IN PLACE IT WILL CAUSE ABS BRAKE PROBLEMS.

Aug 04, 2009 | 1999 Oldsmobile Alero

2 Answers

Trac off and antilock lights are on


try unpluging your battery cables for 10 to 15 mins.for the comp to reset.itself.

Sep 19, 2008 | 2000 Oldsmobile Alero

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