Buy S4008646110 - Genuine Wabco ABS ECU PABS E4C 24V 6S6M - wisentpartscenter.com

Description

Wabco S4008646110 ABS ECU - Genuine Meritor Wabco SmartTrac ABS/ATC Control Unit, 24V 6S6M

The Wabco S4008646110 is a genuine Meritor Wabco SmartTrac electronic control unit for pneumatic ABS with automatic traction control. It reads the wheel speed sensors and commands the modulator valves to prevent wheel lockup under braking and manage traction on slippery surfaces. This is a 24V, 6-sensor/6-modulator (6S6M) E-version (E4C) controller.

Key Functions:

- Controls ABS and ATC from wheel speed sensor input to the modulator valves
- Configuration-specific ECU (24V, 6S6M) - must match the vehicle's ABS layout

Fitment & Specifications:

- System: Meritor Wabco SmartTrac pneumatic ABS/ATC
- Config: 24V, 6 sensor / 6 modulator (6S6M), E4C version

Verify fitment with us before ordering to ensure the correct part for your application.

Purpose of the Part

The ECU is the brain of the ABS/ATC system. It takes wheel speed signals from each sensor, watches for a wheel about to lock under braking, and pulses the modulator valves to hold, release, and reapply air so the wheel keeps turning and the truck keeps steering. On the traction side it does the reverse - it steps in when a wheel spins on takeoff. It only works when it's the right config for the vehicle and programmed to it.

Issue Symptoms / When to Replace

- ABS warning lamp stays on, ABS/ATC function disabled
- No communication with the ECU on a diagnostic tool
- Stored fault codes pointing at the module or its circuits
- Intermittent ABS dropout, especially with heat or vibration

On codes: these systems store their own DTCs read through Meritor Wabco Toolbox (or a blink code readout), and they point at specific components - a sensor, a modulator, a valve, the pump motor.

Brand Information

Wabco (now part of ZF, long branded Meritor Wabco in North America) builds the SmartTrac ABS, traction, and stability systems used across trucks, tractors, and trailers. A genuine S4008646110 is the correct configuration-specific controller for that system - which is the whole point on an ABS ECU, since it has to match the vehicle's sensor and modulator layout and be programmed to it.

Installation Notes

- Requires programming. A replacement SmartTrac ECU has to be configured to the vehicle with Meritor Wabco Toolbox software - sensor/modulator layout and vehicle parameters - before ABS will work. It is not plug and play.
- Config has to match. Confirm 24V and 6S6M against the truck; the wrong sensor/modulator count won't work regardless of programming.

How to Identify an OEM Part

- Look for the Meritor Wabco SmartTrac label and the WABCO name molded into the housing.
- Find the 10-digit Wabco number in 400 xxx xxx x format and match it to your listing.
- Check for the E-mark (circled E) approval stamp on the label - genuine units carry it.
- Confirm the voltage (24V) and version (E4C) on the label match the listing.

Why buy from Wisent Parts
  • ⏱️
    Fast shipping
    Orders before 12PM EST ship same business day.
  • 🛡️
    180-day warranty
    All parts covered from delivery date.
  • ↩️
    Easy returns
    30-day returns.
  • ✅
    Verify fitment
    Send VIN/ESN and we’ll confirm.

Shop with confidence

Warranty & Return Information
Warranty Information

Wisent Parts offers a 180-day warranty on all parts from the date of delivery. This warranty covers orders placed directly through our website. If a part fails during this period, we’re here to help - whether it’s a replacement, repair, or refund. For full details, refer to the Warranty page.

Return Information

All electrical parts and final sale items are non-refundable and cannot be returned. Please double-check compatibility before purchase. If you have questions, our support team is here to help before you place your order.