Bosch ESP9 ABS unit repair - C123EF0 - Hydraulic Brake Booster - Limit value reached

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From January 1st, 2026, we will be strictly Trade Only for New Zealand Info here

Price Exclusive of GST

Our minimum assessment fee is $150 + GST (Excluding Headlights) this just covers the time to check the unit over. If you go ahead with the repair, we’ll put this towards the total cost. Our full terms of trade is the link can be found here

International Customers:
When sending a unit from overseas, please declare it as “Repair and Return” with a low customs value (around $100 USD) to avoid unnecessary import fees. - All Repair Prices are quoted in NZD



 

Audi ABS Repair – C123EF0 Fault Code: Hydraulic Brake Booster – Limit Value Reached

This is a professional repair service for Audi ABS control modules suffering from the C123EF0 fault – Hydraulic Brake Booster - Limit Value Reached. This issue is typically found in Audi vehicles built between 2010 and 2020, including:

Audi A4, A5, A6, A7, S4, S5, Q5, Q7

Common Part Numbers Affected:

  • 8R0 614 517 T

  • 8R0 614 517 R

  • 8K0 907 379 AD

  • 8K0 907 379 AE

  • 4G0 614 517 T

  • 4G0 907 379 A

  • 4M0 907 379 R

Other variants and supersessions of these part numbers may also be covered — contact us if you’re unsure.

Common Symptoms:

  • ABS warning light illuminated

  • Traction control light on

  • “Brake system fault – stop carefully” displayed

  • Degraded braking performance

  • Emergency braking functions may be reduced or disabled

Important Note: This fault is often caused by a vacuum issue in the vehicle. The fault code will not clear until both the mechanical issue is resolved and the ABS module is properly reset or repaired.

What We Do:

At Get Electronic, we perform a complete teardown and component-level repair of your ABS unit, including:

  • Bench testing of communication and fault logging

  • Targeted circuit board repairs

  • Cleaning and resealing

We can remove the C123EF0 fault code from the ABS module once the vehicle’s vacuum issue is corrected. The repaired module will then accept a clear scan and function as intended.

Questions about this repair?

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