ABS Traction Control Light On: What It Means

Q: Why are my ABS and traction control lights on at the same time?

Both lights share the same ABS control module. When the module sees a fault (most often a bad wheel speed sensor), it disables ABS and traction control together and turns on both warning lights.

Q: Is it safe to drive with the ABS and traction control light on?

Yes for short distances in dry weather. Your regular brakes still work normally. You lose anti-lock braking and traction control, so avoid hard stops, rain, snow, and ice until repaired.

Q: How much does it cost to fix the ABS and traction control light?

A wheel speed sensor replacement runs $150 to $400 at a shop, or $30 to $90 in parts if you DIY. ABS module replacement is the worst case at $600 to $1,200.

Q: Can a bad wheel bearing turn on the ABS light?

Yes. On many vehicles the wheel speed sensor is built into the hub bearing assembly. A worn bearing throws off the sensor signal and triggers ABS and traction codes like C0035 or C0040.

🎯 The Short Answer

Verdict: One shared brain, one shared fault. Your ABS module also runs traction control. When it sees a problem it cannot work around, it disables both systems and lights up both warnings together. The single most common cause (roughly 70% of cases on vehicles 5+ years old) is a failing wheel speed sensor or a corroded sensor connector.

Here is the important part: your regular brakes are not affected. The brake pedal will feel and behave exactly the same. What you lose is the anti-lock function during a panic stop and the wheel-spin control on slick surfaces. That is a real loss in winter, but it is not an immediate emergency on a dry day.

If you also see a flashing brake light or a red brake warning, that is a different and more serious problem. See our guide on the red brake warning light first, because that one can mean low brake fluid or a hydraulic failure.

🔢 The Numbers: Causes Ranked by Frequency

Based on diagnostic data across the most common makes and models in the US fleet, here is what actually triggers both lights together:

Cause	Frequency	Typical Repair Cost	Common Code
Wheel speed sensor (front or rear)	~55%	$150-$400	C0035, C0040, C0045, C0050
Damaged sensor wiring or connector	~15%	$80-$220	C0030, C0034
Bad wheel hub bearing (integrated sensor)	~10%	$350-$700	C0035, C0040
Damaged tone ring / reluctor	~8%	$200-$500	C0035, C0040
Low brake fluid / pad sensor	~5%	$0-$250	varies
ABS control module failure	~5%	$600-$1,200	U0121, C0110
Steering angle / yaw sensor	~2%	$200-$500	C0050, C0051

If you have a check engine light on at the same time, look at any P-codes first. They will usually be unrelated, but the C0035 code (front left wheel speed sensor circuit) is the single most common ABS code we see logged.

🩺 The 3-Minute Test to Confirm It

Before paying anyone, do this. It takes longer to read than to do.

Drive at 25-30 mph on a quiet street. Watch the speedometer. If it works smoothly, the front sensors are probably fine because most cars use a front wheel sensor for the speedo signal.
Brake gently from 25 mph in a straight line. If the car pulls slightly or you hear a faint grinding from one wheel as you slow, that wheel is likely the bad one.
Try to clear the lights. Turn the ignition off, wait 30 seconds, start the car. If the lights come back on within the first 5-10 seconds of driving, you have a stored fault, not an intermittent one.
Scan it. A basic OBD2 scanner will not read ABS codes. You need one that supports ABS / chassis codes (a $30 unit from a parts store works, or many auto parts chains scan ABS codes for free now).

The code will name the exact wheel (FL, FR, RL, RR). That tells you which sensor to inspect first, which removes about 80% of the guesswork.

✅ When This Is a Cheap Fix (and When It Is Not)

Cheap fix territory ($30-$200 DIY, $150-$400 shop)

You have a specific C-code for one wheel sensor.
The car is under 10 years old.
You live in a non-rust state or the underside looks clean.
The fault is intermittent (light flickers, comes and goes with bumps).

Expect to spend more ($500-$1,200)

The light came on with a grinding or growling noise from a wheel. That is a hub bearing, and on many vehicles the sensor is part of the hub assembly.
You live in a salt belt state and the car is 10+ years old. Sensor bolts snap, connectors corrode, and tone rings rust apart.
Multiple codes from multiple wheels showed up at once. That points to a wiring harness, the ABS module itself, or a power supply problem.

⚠️ Common Mistakes People Make

Replacing the sensor before cleaning the connector. A 5-minute cleanup of a corroded plug fixes this maybe 20% of the time. Always look first.
Buying a generic OBD2 scanner and assuming no codes means no problem. ABS codes live on a separate bus. Standard scanners do not see them.
Ignoring it because brakes still work. Fine in July. Not fine the first time it rains on the highway.
Replacing the ABS module first. It is the most expensive part and the least likely cause. Save it for last.
Confusing this with the TPMS light or the flashing check engine light. Different symbols, different systems, different urgency.

🧭 Decision Framework: What to Do This Week

Pick the row that matches you:

Your Situation	What to Do	Urgency
Lights came on, dry weather, car drives normal	Scan ABS codes within a week. Schedule sensor replacement.	Low
Lights on + grinding or growling from a wheel	Stop driving highway speeds. Hub bearing likely failing.	High
Lights on + winter weather + you commute	Get it diagnosed this week. No snow driving until fixed.	High
Lights on + flashing red brake light	Stop driving. Check brake fluid. See red brake light guide.	Emergency
Lights flicker on bumps, then go off	Loose connector or cracked sensor wire. Easy DIY.	Low

❓ FAQ

Why are my ABS and traction control lights on at the same time?

They share the same control module. When the module detects a fault (almost always a wheel speed sensor), it shuts down ABS and traction control together and turns on both warning lights as a pair.

Is it safe to drive with the ABS and traction control light on?

Short distances in dry weather, yes. Your normal brakes work the same. You lose anti-lock braking and wheel-spin control, so avoid panic stops, rain, snow, and ice until it is repaired.

How much does it cost to fix the ABS and traction control light?

A wheel speed sensor replacement is typically $150 to $400 at a shop, or $30 to $90 in parts if you DIY. ABS module replacement is the worst case at $600 to $1,200, but that is only about 5% of cases.

Can a bad wheel bearing turn on the ABS light?

Yes. On many newer vehicles the wheel speed sensor is built into the hub bearing assembly. A worn bearing throws off the sensor signal and triggers codes like C0035 or C0040, lighting both ABS and traction control.

Will the ABS light reset itself?

Sometimes. If the fault was intermittent (a loose connector or one bad signal), the light may clear after a few key cycles. A stored hard code will stay on until you scan and clear it with a tool that supports ABS codes.

📋 Summary

If your ABS traction control light pair is on, here is the takeaway in five lines:

Both lights together means one shared system, one shared fault.
It is a wheel speed sensor or its wiring about 70% of the time.
Normal brakes still work. You are safe to drive home, not safe to push limits.
Get an ABS-capable scan ($30 tool or free at a parts store) before paying anyone.
Budget $150-$400 for the typical fix. Hub bearings and modules cost more but are rare.

The fastest way to know exactly which sensor, which part number, and which steps for your specific vehicle is to run a free AI diagnosis. Two minutes of questions, ranked causes, and a real repair plan.

ABS and Traction Control Light On Together: What It Actually Means