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Symptoms Of A Failing ABS Control Module

Here are some common reasons for a failing ABS control module (ABS controller) that’ll require a repair or replacement done:

1. ABS Warning Light Is On

If your warning light is on, it’s probably because something is off with your ABS brake system. However, a whole bunch of issues can trigger the ABS warning light to turn on, like:

• ABS module failure: Corrosion is usually the cause because even a tiny bit of rust in the brake control module can start problems.
• Faulty ABS speed sensor: The ABS sensor may be damaged, an electrical connector or harness could be loose, or dirt might have struck the ABS sensor.
• Low brake fluid: This can happen due to a leak in a brake line or the master cylinder.
• A worn ABS pump: A damaged anti-lock braking system pump can’t transmit proper brake pressure to the wheels.
• Bulb check error: Some cars perform a bulb check when turned, where all the dashboard lights come on for a bit. A glitch can keep the ABS light on for no reason. Fortunately, your mechanic can read an ABS code generated by a triggered ABS light to detect the issue causing the anti-lock braking system error.

Note: Older cars with an anti-lock braking system may not have an ABS light. Instead, they use the check engine light. Don’t confuse these two lights with the brake light, which lights up when engaging the parking brake.

2. Increased Braking Effort Or Unresponsive Brake Pedal

A bad ABS control module can make it extremely difficult to stop your vehicle. 

You probably will notice a deterioration in brake performance. As a result, you’ll have to push the brake pedal a few times to get a response. It can eventually get worse, where there’s no response at all upon hitting the brakes.

This can point to a failing ABS control module that can’t process wheel sensor responses and adjust the brake pressure accordingly.

Note: This can also be due to low brake fluid levels. So it’s best to have the entire brake system checked. Consider a brake fluid system flush to ensure no air exists in any brake line. 

3. Wheels Lock Up Often

If your wheels lock up often, you have ABS issues. After all, the ABS should avert lock-ups!

The ABS control module ensures that your wheels don’t lock up when traction ceases to exist. However, as this part fails, the information required to prevent wheels from locking isn’t correct.

If your wheels lock up when traction is lost, the ABS control module might be to blame. Typically, you’ll only notice the problem if you slam on the brakes. Otherwise, if the wheel is constantly locking up, it could be a stuck brake caliper instead.

4. Inaccurate Speedometer Readings

If you have a bad ABS control module, the speedometer can stop operating normally. This is a rare event.

In such a case, the speedometer will stay at 0 mph or read the wrong speed.

5. Funky Brake Pedal

An ill-functioning ABS control module will send inaccurate information to the brake system. This can cause your brake pedal to pulsate at random moments as you drive. 

How Much Does An ABS Control Module Replacement Cost?

An ABS control module replacement can cost you $320 to over $1,000, depending on the price of the module and how difficult it’s to source it. 

The labor cost can be around $80-$120.

How Urgent Is An ABS Control Module Replacement?

The ABS control module rarely dies. But if it does, you will need to replace it ASAP.

Moreover, your Electronic Stability Control (ESC) and Traction Control System (TCS) are dependent on the anti-lock braking system. This means a failing ABS control module will impact the ECS and TCS, endangering your road safety.

5 FAQs About The ABS Control Module

Here are the answers to some ABS control module-related questions:

1. What Is An ABS Control Module?

The ABS (anti-lock brake system) control module or ABS controller is one of the most important parts of your brake system. The main job of this auto part is to prevent the uncontrollable skidding of your vehicle by providing improved traction as necessary. 

The ABS control module draws information from each wheel speed sensor via an ABS wiring harness to understand when the wheels move at inconsistent speeds. The ABS then regulates brake pressure accordingly to improve safety.

2. How To Replace The ABS Control Module?

Here’s a general step-by-step guide to replacing a defective ABS control module. For vehicle-specific information, stick to the procedures in your owner’s manual.

Note: If you’re unfamiliar with automotive repairs, it’s always better to get this done by a professional mechanic.

• Step 1: Ensure you have the required tools and replacement parts within reach, including line wrenches, ratchet, scan tool, socket set, screwdriver, protective wear, and a new module.
• Step 2: Park your vehicle on a flat surface. Keep the transmission in park and emergency brakes on.
• Step 3: Disconnect the cable from the battery’s negative terminal.
• Step 4: Locate the ABS control module, generally installed in the engine compartment or frame rail on the driver’s side. If the ABS unit is located in the frame rail, use a jack stand to lift the vehicle.
• Step 5: Disconnect each electrical connector attached to the ABS unit or control unit. Remove each mounting bolt of the connector to extract the module.
• Step 6: Compare the old module to the new one to confirm if the specs match.
• Step 7: Install the new ABS control module on a clean mounting surface and screw every mounting bolt back again.
• Step 8: Finally, reconnect the connectors to the valve assembly and battery’s negative cable. If done right, the ABS warning light will switch off in the next few minutes after turning on your vehicle. 

3. What Should I Expect From My Mechanic During An ABS Module Repair?

During an ABS module repair, your mechanic would:

• Confirm if the ABS control module is bad
• Remove and replace the defective ABS control module
• Conduct a brake system flush
• Add new brake fluid (brake fluid change is mandatory for some anti-lock brake systems).
• Examine other parts of the braking system for further potential problems, including brake pads, master cylinder, etc.

Note: You can install a remanufactured module or rebuild your current module.

4. Can I Drive Without An ABS Module?

You can drive without a functional anti-lock braking system control module. Just make sure that your conventional brake system isn’t failing.

However, beware of wet or slick conditions, as the brakes’ anti-lock feature won’t function, and you probably won’t have steering control if the tires lock up.

Your ABS might also have an Electronic Brake Distribution system, where the ABS module controls the front and rear brake bias. In this case, if the ABS control module isn’t working, your vehicle may feel less stable than usual when braking. 

5. Does A Bad ABS Control Module Drain My Car’s Battery?

A failing ABS module can cause the ABS pump to operate constantly, eventually draining your car battery.

In that case, call for an auto repair service and let the mechanic remove the ABS fuse to prevent a dead battery or burning out the ABS pump. The ABS fuse is typically located in the fuse panel in the engine compartment.