One common fault code which occurs on the Audi / VW ESP9 ABS pump / module is C123EF0 / 15381504 (hydraulic brake booster limit value reached). A malfunction within the brake vacuum system (such as brake servo pressure sensor) can cause this type of ABS pump to fail after a certain number of brake pedal operations. The ABS module will shut down when fault code C123EF0 / 15381504 is flagged in the unit.
In some cases, fault code C11EC04 (brake booster pressure sensor malfunction) may be present along with a red brake warning light.
Vehicles this type of ABS pump can be found fitted to include:
• Audi A4 (2015 – 2020) / Audi A5 (2016 – 2020) / Audi A6 / Audi Q7 / Audi Q5 / Audi SQ7 / Audi SQ5 / Audi RS7 / Audi RS5 / Audi S4 / VW Toureg
Part numbers of this type of ABS pump include:
• 8W0907379J / 8W0907379Q / 8W0907379AF / 8W0614517N / 8W0614517H / 4M0907379K / 4G0907379T / 80A907379E / 8W0907379AA
• 0265956241 / 0265956658 / 0265956840 / 0265956194 / 0265956226 / 0265956659
One option to repair the C123EF0 fault is to replace the ABS pump with a new one which can be very costly and programming will be required. We offer an alternative solution; repair of your existing ABS pump for just £175 (including courier collection and return shipping). To get this ABS pump repaired, select your vehicle from our ECU catalogue below: