In my Volvo truck the TCS light is on all the time how to turn of

This indicator has three functions:
It comes on as a reminder that you
have turned off the Traction
Control System.
It flashes when the TCS is
regulating wheel spin.
If it comes on and stays on when
the Traction Control System is on,
it indicates that there is a problem
with the TCS.
This indicator also comes on for a
few seconds when you turn the
ignition switch to ON (II). If it comes
on and stays on at any other time, or
it does not come on when you turn
the ignition switch to ON (II), there
is a problem with the TCS. Take the
vehicle to your dealer to have it
checked. See page
for more
information on the TCS.

It could be a number of things...go here and read up about it: https://acurazine.com/forums/second-generation-tl-1999-2003-98/d5-indicator-flashin-tcs-check-engine-light-556602/

have alternator out put checked with engine running should be 13.5 - 14.5 volts.if alternator not faulty could have bad wheel speed sensor or wheel bearing failing.

Whenever this warning light or any other stays on in the dash it is indicating that the systems control module (or the system sensor in the case of lights like low oil pressure, door open indicators etc.) has detected a fault, it then disables the system (this applies to ABS,TCS, TCM, SRS and BCM faults and others) as long as the light is on. You must now have the dealer hook up a special electronic diagnostic tool and "scan" the system for the fault code that is stored for the problem(s)

Legend of Abbreviations. ABS Antilock brake system.TCS Traction control system, TCM Transmission control module, SRS Supplemental restraint system, BCM Body control module

Hi there:

Pull the codes to get started. Normla process is when the slip light will flash on and then go off. TCS is your Traction Control System. It is normal for it to go off If the rear wheels are slipping. You may have worn tires or you are driving on ice or snow. Are you on a slippery surface when this happens? You can always shut the system down by pressing the TCS off button in the center console.


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Either you have a problem with the TCS (Traction Control System), or the TCS is switched off. Most cars with TCS have a button on the shift or the dash labeled "TCS" or "TCS OFF". Find the button, and press it with the car running in gear. If the light goes out, problem solved.
If you cannot manually disengage TCS (no button), or when you press the TCS button the light flashes, check all your brakes and make sure none are dragging or worn out. Also make sure all your tires are properly inflated and balanced, and none are worn out.
TCS works by controlling your brakes on slippery roads and will dynamically apply the brakes to each wheel in order to prevent a skid, even when your foot is not on the brake pedal. During normal driving, the TCS light is out and will either come on briefly or flash when it is active and preventing your car from going into a skid. When the light is on constantly, the system is disabled- either because it was shut off by the driver pressing the TCS (or TCS OFF) button, or because the system has detected a brake problem and automatically disabled it for safety reasons. Worn or dragging brakes, a tire that is flat or worn, or even a wheel that is badly out of balance will cause the system to disable itself, and a severe wheel alignment problem will also.

The TCS stands for Traction Control System, I believe. The TCS is controlled by inputs from the wheel speed sensors. If you have a bad sensor, then a new hub may be required to repair it.

The check engine light may be a sepawrate problem. Have the codes scanned for both the Anti lock braking sytem, TCS, and the check engine light.

Sometimes it will require a separate scanner for the TCS/ABS vs. the Check Engine light.

Good luck on this diagnosis and repair.

Traction control is on all the time, as soon as you start the car. If you push the button, you are turning it off. In other words, when the light is on , the tcs is off.

some markets have a button on the dash with tcs/abs and a dash light saying "tcs off".if your car has not got the button then you cant turn it off(germany yes.uk no)abs/tcs should only be turned off in deep snow,otherwise best left alone,unless you have been taught how to drive with/without.....(on ice you wants the wheels to turn,on snow you want the snow to wedge to slow you down......)see what i mean???

The default is off so each time the vehicle is turned off, it goes to off. You need to turn it on when you want it on but it will always turn off when the car is turned off.