ABS pump Audi C123EFO Limit Valve Reached
Audi ABS/ESP Bosch EPS 9.0 – Repair for fault code C123E F0
Audi uses the Bosch EPS 9.0 ABS/ESP pump, equipped with the HBC system (Hydraulic Boost Compensation), in various models.
This system supports brake assistance when insufficient vacuum is available. However, the functionality of HBC is limited.
When the maximum limit is reached, fault code C123E F0 is permanently stored in the ABS control unit:
- Hydraulic Brake Boost – Limit Value Reached
- Audi C123EFO Limit Valve Reached
What does fault code C123E F0 mean in Audi?
Fault code C123EF0 means that the HBC system has reached its limit and the ABS/ESP pump is no longer functioning correctly.
In this case, overhaul of the ABS pump is necessary.
The ABS control unit must be sent to us for professional repair.
Important:
Replacing or installing a reconditioned ABS pump without resolving the vacuum problem will cause fault code C123E F0 to reoccur.
Most common causes of C123E F0
-
Defective Brake Booster Pressure Sensor
Sensor near the brake booster. Older versions have a factory defect and must be replaced with the latest version.
-
Vacuum pump problems
Integrated into the oil pump. Known for production defects in older models. -
Leaking vacuum hoses
Wear, cracks or damage (e.g. by martens). -
Leaking brake booster
Insufficient vacuum build-up for correct braking.
Important installation instruction
✔️ First resolve all vacuum problems
✔️ Only then install the reconditioned ABS/ESP pump
✔️ This is the only way to prevent recurrence of fault code C123EFO
Hersteltijd: 1-2 days
- Make sure the device is properly packaged.
- Print the repair form and fill in all details clearly.
- Send or bring the part to us together with the completed repair form.
- If possible, please include the ECU error protocol (error number).
To check and repair the device we need the complete ABS pump including the hydraulic valve block.
The device does not need to be coded or programmed after repair.
We work for private individuals and garage companies. Our qualified staff is familiar with almost all types of ABS pumps in almost all possible vehicles. Thanks to this knowledge, we can offer manufacturer- and brand-independent services to private individuals, car garages and car companies.
Quality
When you choose us, you choose quality. When you call us and submit your problem, we will discuss the details of the repair and provide you with a preliminary quote. If you agree, you can send or bring the defective part. Our professionals will repair it and you will get your part back as new.
Experience and a fantastic warranty
Experience is our greatest asset. ABS Control Devices is continuously developing and our professionals are always aware of the latest innovations. By prioritizing knowledge and skills and by systematically investing in professional diagnostic and specialized equipment, we can offer our customers the best possible service and we also provide a 2-year warranty on the work carried out.
Professionality
Professionalism and the highest level of service – these are the rules we always remember in collaboration with the customer.
If you are interested in our services, please contact us!
This can be done by e-mail and telephone. We work for clients at home and abroad. Our main customers are in the Netherlands, Germany, Belgium, France, Turkey, Italy, Spain and Poland.
Would you like to have a defective part repaired by ABS Control Units?
Then create a repair order for the defective ABS pump Audi C123EFO Limit Valve Reached and send the defective part or bring it to us. The part will be repaired by us. You will receive the parts back within a few days with a warranty .
