99 and newer Volvo S80 Control Unit ABS / STC

96-97 850 Control Unit TRACS 2 / 4WD, Control Unit ABS

98-01 Volvo C70, S70, V70 and V70 XC Control Unit TRACS 2 / 4WD, Control Unit ABS

Also known as ABS Computer, Controller and Module

Is the ABS TRACS light on intermittently? The reason could be a defective ABS module. Upon inspection and troubleshooting, about 90% of the Volvos that have intermittent ABS light will result in the replacement of the ABS unit.

These are some symptoms of a defective ABS unit:

1996 - 1998 850, C70, S70, V70 and V70XC (Includes all the variations)

• The ABS and TRACS (If you have TRACS) lights will turn ON and stay ON for some time, sometimes the light will turn OFF. The longer you experience the problem, the longer the lights will stay ON. If you drive the car for a long time with a defective ABS unit, the speedometer will eventually stop working intermittently.
• The problem will be more noticeable during hot weather or when the ABS or TRACS system is used.
• Sometimes the ABS system will activate by itself (You will hear the pump and the valves activating) when going over a bump or rough road, you may also feel vibration on the brake pedal.
• The cruise control disengages or will not work at times.

1999 -2001 S80, S80 T6, C70, S70, V70 and V70XC (Includes all the variations, excluding DSTC)

• The ABS and TRACS (If you have TRACS) lights will turn ON and stay ON for some time, sometimes the light will turn OFF. The longer you experience the problem, the longer the lights will stay ON. On 1999 and newer Volvos, the speedometer and odometer will stop working, the odometer and trip meter will display dashes "--- ----". You may also see the up-shift indicator (Yellow up arrow) ON or flashing and in other models you may see a yellow triangle with a car skidding.
• You may see the Check Engine Light turn ON and the transmission may not shift correctly.
• Sometimes the ABS system will activate by itself (You will hear the pump and the valves activating) when going over a bump or rough road.
• The problem will be more noticeable during hot weather or when the ABS or TRACS system is used.
• On the S80 and some T5 models with STC, you will see the ABS, STC and warning triangle light turn ON. In addition, you may see a warning message in the message display window that reads "Brake Failure", "Stop Immediately".
• The cruise control disengages or will not work at times.

The Volvo ABS module (Computer) at a dealer sells for about $450.00 plus tax. This is in addition to the diagnosis and labor to remove and replace. In 1999 and newer Volvos the units cost as much as $750.00.

Sometimes the computer will have no trouble codes stored in the memory. Troubleshooting only leads to the replacement of the ABS module (computer).

This is how the deal works.

If you need to have your own unit tested and or repaired. You need to have it removed by a professional and sent to me.

The unit is removed fairly easy, In a scale of 1 to 10, it is about a 6, it is easier than changing the brake pads on your Volvo.

You will need a very special tool, it is a Torx wrench (socket) E5 (Fairly difficult to find) and a 1/4" ratchet driver. If you don't have one, go to the removal instructions page and you will find a link to purchase the tool.

I will test your module before I inspect it. This involves testing it on a vehicle similar to yours.

If the unit is defective and in condition to be rebuilt, I will attempt to perform repairs. I say attempt because I have found some units that cannot be repaired, this happens mostly on units that somebody else has opened. This involves opening the unit for the actual repairs.

Upon completion of repairs, your unit will be tested again, then sealed and sent back to you.

The unit carries a 5 (five) - year warranty.