ESC Warning Lamp and ECU Replacement
TSB-54-379-FTL

Creation Date: 2026-01-22
Last Revision Date: 2026-01-28

Engine or Vehicle Affected:
» Business Class M2-Plus
> 108SD Plus/114SD Plus
» 108SD/114SD
» New Cascadia
Description of Revisions: This bulletin replaces the version dated

01/22/2026. The ECU part number has been updated.
Warranty applies to this described condition. See the warranty information at the end of this bulletin.
Described Condition:
Vehicles equipped with mBSP braking and ESC that show repeated DTC 1810/02 and a yellow ESC warning lamp

(ESC disabled) have a longitudinal acceleration fault.

This fault occurs when wheel speed sensor data does not match the ESC sensor during straight-line acceleration
or deceleration with no control functions active (ESC, XBR, ABS, DTC).

Replace the Electronic Control Unit (ECU) to correct this issue. Only vehicles with ABS ECUs identified in the
table 1 apply to this service bulletin. For the replacement ECU part number, see the table 1.

Table 1, Replacement of ECUs

Item | Old Part Number Description New Part
No. Number
1 WAB 400 867185 | 6S6M ESC ATC WAB 400 867
0 238 0
2 WAB 400 867 226 | 6S6M HSA ESC WAB 400 867
0 ATC 2390
3 | WAB 400 867 225 | 6S6MESC ATC WAB 400 867
0 PLC 238 0
4 WAB 400 867 223 | 4S4MESC ATC WAB 400 867
0 PLC 2360
5 WAB 400 867 224 | 4S4M HSA ESC WAB 400 867
0 ATC 2370
Table 1, Replacement of ECUs
Removal of the ECU

1. _ Park the vehicle on a level surface, shut down the vehicle, and apply the parking brake. Chock the tires.

2. — Disconnect the wiring harness from the ECU.

3. Remove the mounting hardware to remove the ECU from its location. See ECU Removal instructions in the appropriate Workshop Manual .
Installation of the ECU

1.

Install the ECU with the appropriate mounting hardware and tighten to the manufacturer's specifications. See ECU Installation instructions

in the appropriate Workshop Manual .

2. Connect the wiring harness to the ECU.
3. Perform the following steps;

a. — Turn the keyswitch to the ON position and verify the ABS self-test, the ABS warning light should illuminate and then turn OFF.

b. Program the ECU using WABCO Toolbox software. See Programming Instruction below.

C. _ Perform the ESC End-of-Line calibration procedure as outlined in the WABCO manual. Once complete, the ABS and ATC/ESC warning
indicators should illuminate when the keyswitch is in the ON position, and then turn off. For post-installation calibration, see step 70 in
the Programming Instruction below.

4. — Remove the chocks.

5. — Test the ECU.

Programming Instruction

Note: Ensure that the software WABCO TOOLBOX is updated to the latest
version (14.6 at time of publication) or newer.

1. — Go to the https://wabco.snapon.com/Login.aspx.

2. — Login to the WABCO page.

3. Select ‘Aftermarket Programming Configuration File’ See Fig. 1 and Fig. 2.

Home Support MyAccount> As Built- Contact

TOOLBOX Software Aftermarket Programming Configuration Files Retrofit Configuration File

Home / Catalog

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Fig. 2, Select Configuration File

4. _ Enter the full VIN and old part number in both places and select ‘Find Configuration’ See Fig. 3.

Part Oetats VIN 5SKKMBWFG6TLWS 1876

Al 17 Characters

ECU Part Number Being Replaced’ 4008672250

10 Ungits (4000000000)

New ECU Pan Numocr 4006072250

10 Digits (4002000000)

2 nave reac the limitations above and confirm thal this vehicle supports J1639 communications

11/04/2025 121727

Fig. 3, Finding the Configuration File

5. Select ‘Add to shopping cart. See Fig. 4.

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Fig. 4, Adding the Configuration File to Shopping Cart

6. — Checkout the configuration file in the cart. See Fig. 5.

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Fig. 5, Checkout the Configuration File in the Cart

7. — Select ‘Billing to the Address.’ See Fig. 6.

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Fig. 6, Billing to the Address

8. Agree to the terms and place the order, then download and save the file. Open the WABCO Toolbox and ensure it is up to date. Select
‘Aftermarket Programming’ and confirm the pop-up, then choose the downloaded file to begin programming. Review the pass/fail result. If it
passes, turn the keyswitch to the OFF position to allow the vehicle to save all the parameters correctly. See Fig. 7.

Check tor Software Updates

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9. Perform a key cycle that completes a vehicle ECU sleep cycle to save the programming updated data.
Note: For issues regarding the WABCO TOOLBOX software downloading and
installation process, call WABCO at 1-855-228-3203 or email
[email protected].
Note: ESC calibration is required after the programming process is complete.
10. — The ABS ECU is now in the ESC calibration mode. Use WABCO TOOLBOX to perform the ESC calibration procedure. Complete the driving
portion of the End of Line (EOL) procedure. After approximately 100 yards of straight-line driving and then a 90 to 180 degree turn is recorded
by the ABS ECU, the stability lamp on the dash will turn off. See Fig. 8.
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Fig. 8, Verifying the Version, Download and Program
11. — The ECU memory should now be clear of any faults.
12. — Perform a key cycle that completes the vehicle sleep cycle to save the calibration data.
Warranty

This procedure is warrantable only if the described condition exists and the repair is performed within the
applicable base or extended coverage warranty period. If a failure is not found, this procedure is considered

preventive and warranty does not apply.

See Table 2 for OWL VMRS codes and labor allowance information. Enter this service bulletin number in the

Service Bulletin # field.

Table 2, OWL VMRS Codes and Labor Allowance, eCascadia Vehicles

Primary Failed Part Component Code Cause Code Correction Code SRT Code Description Hours
WAB 400 867 185 0 013-011-076 51 03 330-5022A R&R ABS ECU 1
Table 2, OWL VMRS Codes and Labor Allowance, eCascadia Vehicles

Note:

REPLACE

FO7

F18

F15

F25

F16

F26

F35

F36

013-011-076

Document Number: 0000207674
Topic Publication Date: 2026-01-28