Summary: When the ABS and traction control lights come on together, it almost always means the car has lost one or more wheel-speed signals or has an internal fault inside the shared ABS / ESP pump & module. Both safety systems are deliberately disabled at the same time because they rely on exactly the same sensors and hydraulic control unit.
We see this exact combination every single day on the hundreds of ABS units sent to us from garages and owners across the UK — the majority are fully repairable by rebuilding the control module and hydraulic block rather than replacing expensive sensors that aren’t actually broken.
If both lights are on and basic checks (fluid, fuses, wiring and cleaning sensors) haven’t cured it, the fault is likely inside the pump/module itself. Send it to the UK’s largest ABS & ESP remanufacturer — explore our ABS repair services with full testing, component-level rebuild and unlimited-mileage lifetime warranty.
Seeing both the ABS and traction control warning lights appear on your dashboard can be worrying — and for good reason. These two systems are vital safety features designed to help you maintain control of your vehicle during braking and acceleration. When they come on at the same time, it’s a sign that something within your braking or stability system isn’t functioning properly.
Below, we’ll break down what it means when both lights illuminate, the most common causes, whether it’s safe to drive, and how Sinspeed can help you get back on the road safely.
Understanding ABS and Traction Control
ABS (Anti-lock Braking System) prevents your wheels from locking during hard braking. It uses sensors to detect when a wheel is about to skid and automatically pulses the brakes to maintain grip, helping you steer safely even in an emergency stop.
Traction Control (TCS) works alongside ABS. It prevents wheel spin during acceleration, especially on slippery roads, by reducing engine power or applying brake force to specific wheels.
Because both systems share many of the same sensors and the same control module, it’s very common for both warning lights to turn on together — often due to a single fault.
Common Reasons Why Both Lights Come On
1. Faulty Wheel Speed Sensor
Each wheel has a speed sensor that monitors rotation and sends data to both the ABS and traction control systems. If one sensor becomes dirty, damaged, or fails, it sends incorrect data to the module. This immediately disables both systems as a safety precaution, triggering both lights.
Symptoms: ABS & traction control lights on, inconsistent speedometer readings, or unusual braking behaviour.
2. Damaged Sensor Wiring or Corrosion
The wiring connecting the wheel speed sensors can become damaged or corroded, especially near the wheel hub where exposure to water, salt, and debris is high. Even a small break in the circuit can cause communication loss between the sensor and the ABS module.
Fix: A technician can check the continuity and repair or replace the wiring harness.
3. Low Brake Fluid Levels
Your ABS system relies on hydraulic pressure to function correctly. If your brake fluid is low, it can trigger the ABS warning light. Low fluid can result from normal wear of brake pads or from a leak in the brake lines.
Check: Ensure the brake fluid reservoir is filled to the correct level and the fluid isn’t dark or contaminated.
4. Failing ABS Pump or Hydraulic Unit
The ABS pump builds hydraulic pressure when the system engages. If this unit fails, both ABS and traction control lights may appear, as the system cannot maintain pressure safely.
Warning Signs: Softer brake pedal, longer stopping distances, or a buzzing noise when braking.
5. ABS Control Module Fault
The ABS control module is the system’s brain, interpreting data from sensors and controlling braking actions. If it fails or loses communication, both warning lights will illuminate.
Note: Control module faults are often repairable and don’t always require a costly replacement.
6. Worn Brake Pads or Components
Excessively worn brake pads can affect how the braking system performs and occasionally trigger ABS faults. The system compensates for the additional pedal travel, which can confuse sensor readings.
Solution: Regular brake inspections prevent secondary ABS issues. Check out our article on common brake wear indicators.
7. Software or Calibration Errors
In modern vehicles, software issues can cause false warning lights. A reprogramming or recalibration using specialist diagnostic tools may be all that’s needed.
8. Electrical Glitches or Blown Fuses
Sometimes, the lights are triggered by low voltage or after a flat battery or jump start. A simple reset or fuse replacement may clear the issue if no mechanical fault exists.
Can You Drive with the ABS and Traction Control Lights On?
If both lights are on, your car will still brake — but the safety assist functions are disabled. This means:
- Your wheels could lock during emergency braking.
- You may lose steering control in a skid.
- Traction may be reduced on wet, icy, or uneven roads.
If both lights stay on after restarting the vehicle, it’s strongly advised not to ignore them and it is an MOT failure. Drive cautiously to a safe location and arrange a professional diagnostic inspection.
Diagnosing the Fault
At Sinspeed, we use advanced diagnostics to identify the exact cause of ABS and traction control issues. Our engineers can repair the ABS control module, replace faulty sensors, and restore communication between systems without replacing entire units unnecessarily.
We work with both trade clients and vehicle owners nationwide. Parts can be sent to us directly by post or courier — once repaired, we return them ready to refit.
Typical Repair Costs
| Service | Typical Cost (Excl. VAT) | Turnaround Time | Warranty |
| Wheel Speed Sensor Replacement | £90 – £150 per wheel | 1–2 working days | 12 months |
| ABS Pump / Module Repair | £150 – £350 | 2–3 working days | Lifetime warranty |
| Wiring / Connector Repair | £70 – £120 | 1–2 working days | 12 months |
| Brake Fluid Flush & Replacement | £60 – £90 | Same day | — |
| Diagnostic Scan | £85 | Same day | — |
(Prices are estimates for repair services and may vary depending on vehicle make and fault type.)
Why You Shouldn’t Ignore the Warning
Ignoring ABS and traction control warnings can lead to:
- Increased stopping distances
- Higher risk of skidding in emergency situations
- Costlier damage to sensors or modules if faults worsen over time
Prompt repair ensures your vehicle’s safety systems continue to protect you — and keeps your car MOT-ready, since illuminated warning lights can lead to an MOT fail.
How Sinspeed Can Help
At Sinspeed, we specialise in electronic brake and traction systems. Our repair solutions include:
- ABS pump and ECU module repairs
- Wheel speed sensor & motor faults fixed
- Hydraulic pump and valve block overhauls
- Full diagnostics and reprogramming
All repaired units are fully tested, returned with a lifetime warranty, and ready to fit.
In summary:
When your ABS and traction control lights come on together, it’s your car’s way of telling you something isn’t right. Whether it’s a simple sensor fault or a module issue, getting it checked quickly prevents further problems and ensures your braking system is safe and reliable.
At Sinspeed, we make it easy — professional diagnostics, trusted repairs, and nationwide mail-order service with lifetime warranty support.