2015 Dodge Challenger ABS Light On: Common Causes and Fixes

By Core Brake Parts Tech Team — Circleville, OH warehouse

An ABS light that stays on in a 2015 Dodge Challenger means the car's computer has switched off the anti-lock part of the brake system and stored a fault code. Your normal brakes still work as long as the red BRAKE light is off, but the wheels can now lock in a panic stop and traction and stability control are compromised. On this car the cause is most often a wheel speed sensor, its wiring, or the tone ring it reads, and the only reliable way to know which is to pull the code with an ABS-capable scan tool.

How the ABS System Works on the 2015 Challenger

The 2015 Challenger uses what Dodge calls an electronic brake control system. According to the owner's manual it bundles four functions: the Anti-Lock Brake System (ABS), Traction Control (TCS), Brake Assist (BAS) and Electronic Stability Control (ESC). Electronic Brake Force Distribution (EBD) is also part of it and controls how much braking force goes to the rear axle so the rear wheels do not over-brake.

All of these systems depend on the same input: a speed signal from each wheel. A sensor at every corner reads a toothed or magnetic ring that spins with the hub or axle, and the ABS module constantly compares the four signals. If one wheel slows much faster than the others during a hard stop, the module pulses the brake pressure to that wheel. If one driven wheel spins faster during acceleration, traction control applies that brake and cuts engine power.

Because every function shares those four signals, one bad sensor usually turns on more than one light. That is why many Challenger owners see ABS, traction control and the ESC indicator come on together.

What the Warning Lights Are Telling You

The owner's manual is specific about what each combination means, and it matters for whether the car is safe to drive.

The manual also notes that the ABS light may stay on for as long as four seconds at start-up, and that you may hear a slight clicking and motor noise just after you drive off. That noise is the system's self-check cycle, not a fault.

Common Causes of an ABS Light on a 2015 Challenger

1. Wheel speed sensor failure

This is the most frequent cause. Sensors live right next to the brakes, where they take heat, water, road salt and brake dust for years. An internal failure or a cracked housing produces a code for one specific wheel, which is the good news: the code tells you which corner to look at.

2. Damaged wiring or connectors

The sensor harness runs along the suspension and flexes every time the wheel moves. Chafed insulation, a pulled connector or corrosion inside the plug gives the same code as a dead sensor. Brake technician references point out that wiring faults are one of the main failures, and that wiring routed near ignition, charging or data wires can pick up interference and cause false readings. Always inspect the full harness before buying a sensor.

3. Tone ring damage, rust or debris

The sensor reads the teeth or magnetic poles of a ring on the hub or axle. Rust swelling, a cracked ring, a missing tooth or packed-in metal debris creates a signal that drops out or looks erratic, which the module flags as a sensor fault. Replacing the sensor will not fix a bad ring.

4. Wheel bearing play or wrong air gap

The gap between the sensor tip and the ring is small. A worn hub bearing lets the ring wobble, so the gap changes as the wheel turns and the signal becomes unstable. Brake trade references note that loose bearings can trigger false codes or unwanted ABS activation. A sensor that is not seated fully, often after brake or hub work, does the same.

5. Mismatched tires or wrong tire size

The owner's manual states that all wheels and tires must be the same size and type and properly inflated to produce accurate signals for the computer. A Challenger with a different size on one axle, a compact spare, or one badly underinflated tire can make one wheel appear to spin at the wrong speed. This is worth ruling out, especially on cars with aftermarket wheels.

6. Low brake fluid, hydraulic or module problems

If the red BRAKE light is also on, check the fluid first. The manual explains that fluid level drops normally as disc pads wear, but a low level can also mean a leak. Less common causes include a failing ABS pump motor or control module and low system voltage from a weak battery, which can set multiple unrelated codes at once.

How to Diagnose It Step by Step

1. Check the easy items. Confirm the parking brake is fully released, check the fluid level at the master cylinder reservoir, and confirm all four tires are the same size and at the correct pressure.
2. Read the ABS codes. A basic engine code reader often cannot see the ABS module. Use a scan tool that reads chassis and ABS codes, or have a shop do it. The code will usually name the wheel and the type of fault, such as an open circuit or an erratic or missing signal.
3. Look at live wheel speed data. With a capable scan tool, watch all four wheel speeds while driving slowly. A wheel that reads zero or jumps around while the others are smooth points straight at that corner.
4. Inspect the corner. Follow the sensor wire from the connector to the sensor, looking for rubbing, cuts and corrosion. Remove the sensor, clean the tip, and inspect the tone ring for rust, cracks and debris. Check the hub for play.
5. Test the sensor. Two-wire passive sensors can be checked for resistance and AC output while spinning the wheel. Active sensors produce a digital square-wave signal and need a scan tool or a graphing meter to test properly. Follow the factory service procedure for the exact test values.

The Fix and What to Replace Together

Most repairs come down to one of these: a wheel speed sensor, a section of harness or a connector, or a hub bearing assembly when the ring or bearing is the problem. Clear the codes after the repair and road-test the car. The ABS light should go out after the self-check; on many systems it only clears once the module sees a good signal from every wheel while moving.

Because the sensors sit inside the brake assembly, an ABS fault is a good time to inspect the rest of the corner. If the pads are near the wear limit or the rotors are grooved or warped, doing them while the sensor is out saves a second teardown. Browse our brake pads for daily and performance driving and replacement brake rotors. Challenger SRT Hellcat owners upgrading the front end can see the EBC Racing SG2 two-piece floating front rotors for the 2015+ Challenger SRT Hellcat. If the BRAKE light pointed you to a fluid leak, check the brake hoses at each wheel.

When topping up or flushing, the 2015 owner's manual recommends Mopar DOT 3 fluid meeting SAE J1703, with DOT 4 acceptable if DOT 3 is not available. It warns that the wrong fluid can severely damage the brake system.

How hard is the job? Replacing a wheel speed sensor is usually a one-fastener, one-connector job once the wheel is off, well within reach of a home mechanic. Rusted sensors can seize in the knuckle and need penetrating oil and patience. Hub bearing replacement and module diagnosis are more involved, and pump or module work often needs a scan tool to bleed the ABS unit correctly.

Frequently Asked Questions

Is it safe to drive a 2015 Challenger with the ABS light on?

If only the ABS light is on, the owner's manual says the conventional brakes will continue to operate normally, but the anti-lock function is off, so the wheels can lock in a hard stop. Drive gently and get it repaired soon. If the red BRAKE light is on too, the manual calls for immediate repair.

Why are my ABS, traction control and ESC lights all on at once?

All three systems use the same wheel speed signals. When one sensor fails, the module disables every function that depends on it, so the lights usually come on together.

Will disconnecting the battery clear the ABS light?

It may turn the light off briefly, but if the fault is still there the module will detect it again on the next drive and relight it. Read the code and fix the cause.

Can new tires or wheels cause an ABS light?

Yes. The manual requires all wheels and tires to be the same size and type and properly inflated for accurate signals. A mismatched size or a very low tire can make one wheel read differently from the others.

Can a brake job cause the ABS light to come on?

It can. A sensor wire can be stretched or pinched, a connector left unplugged, or a sensor not fully seated during brake or hub work. Recheck anything that was disturbed during the last repair first.

Is there a recall for the ABS on the 2015 Challenger?

The NHTSA recall listing for the 2015 Dodge Challenger shows no recall for the ABS, stability control, wheel speed sensors or brake booster at the time of writing. Check your own VIN with a dealer to confirm.

Sources

1. 2015 Dodge Challenger Owner's Manual, Electronic Brake Control - ABS, TCS, BAS, ESC and EBD make up the system; BRAKE light guidance
2. 2015 Dodge Challenger Owner's Manual, Anti-Lock Brake System - self-check clicking noise; tires must match in size, type and inflation
3. 2015 Dodge Challenger Owner's Manual, ABS Warning Light - start-up behavior; ABS alone vs ABS plus BRAKE light
4. 2015 Dodge Challenger Owner's Manual, Fluids and Lubricants - Mopar DOT 3 SAE J1703, DOT 4 acceptable
5. NHTSA Recalls, 2015 Dodge Challenger - no brake, ABS or ESC recall listed
6. Brake and Front End, Diagnosis of Faulty ABS Systems - start with codes; loose bearings and air gap cause false codes
7. Brake and Front End, Active vs Passive Wheel Speed Sensors - passive AC output vs active digital signal and how each is tested