Repair Service ABS pump Audi 2014-2020 Error Code C123EF0
If your Audi, built between 2014 and 2020, displays the message "Braking system fault - stop carefully."
This message may indicate a serious ABS malfunction leading to a loss of emergency braking function.
Possible error codes:
- C123EF0 - Hydraulic Brake Booster Limit Value Reached
- C123EFO - Hydraulic Brake servo Limit Reached
- 15381504 - Hydraulic Brake Boost
- C123EF0 - Limit Value Reached
- 261632 / P050F 00 - Brake Boost Vacuum too Low
- C123EF0 Hydraulic Brake Booster Limit Valve Reached
- 15381504 Hydraulic Brake Boost
- 263936 / C11EC Pressure Sensor for Brake Booster - Internal System Fault
The error code C123EF0 - Hydraulic Brake Booster Limit Value Reached is a common problem associated with the failure of the Bosch 9 ESP ABS unit.
Cars:
- Audi A4
- Audi A5
- Audi A6
- Audi A7
- Audi S4
- Audi S5
- Audi SQ5
- Audi Q7
- Audi SQ7
Symptoms of error code C123EF0
Typically, this failure manifests as:
- Message "Braking system fault, STOP carefully"
- Malfunctions in the Traction Control System
- Brake pedal defect
- Extended braking distances
- Traction control light activated
- Loss of emergency braking function, leaving only standard braking
What causes error code C123EF0?
The main causes of this fault are: Brake vacuum system malfunction. The brake pedal can completely lose function due to this malfunction if driven on for too long!
If the brake booster system fails, the ABS pump and module may malfunction, leading to code C123EF0.
Important:
We advise that after repairing ABS pumps with fault C123EF0 , always replace the brake booster pressure sensor. Simply installing a remanufactured ABS pump is not sufficient. The underlying cause of the vacuum problem in the vehicle must always be resolved first.
If this is not done, the error code C123E F0 will reappear, even with a remanufactured pump.
Most common causes of error code C123E F0
● Faulty brake booster pressure sensor
The Brake Booster Pressure Sensor is located on the vacuum hose, directly at the brake booster.
- This sensor must be replaced with the latest, improved version.
- The initial versions had a factory defect, which often leads to this malfunction.
● Vacuum pump issue
The vacuum pump is the second most common cause of this malfunction.
- The vacuum pump is integrated into the oil pump.
- This pump also had production defects in earlier versions.
- Replacement with an updated model is necessary.
● Leaks in vacuum hoses
- Wear or cracks in the hoses
- Damage by animals (e.g. martens)
- Poor or loose connections
● Leaking brake booster
- Internal leakage of the brake servo
- Insufficient vacuum build-up for proper brake boosting
Important installation instruction
Only after fully resolving all vacuum issues can the remanufactured ABS/ESP pump be safely installed.
At ABS Stuurapparaten, we offer a fast and effective regeneration of the ABS pump and module, without the need for expensive part replacements. The entire repair takes 1-3 working days and guarantees full functionality of the ABS system, without any additional coding.
You not only save on expensive part replacements, but you also receive a quality guarantee with every repair. Our advanced diagnostic tools and experience make repairs quick and effective.
Don't wait for bigger problems - contact us and restore the full functionality of your Audi! Our Bosch 9.0 ABS pump repair services
At ABS Stuurapparaten, we offer two convenient solutions:
Shipping repair – Send us your Bosch 9.0 ESP ABS unit and we will perform a professional diagnosis and repair.
On-site repair – You can come to our service center, where we will perform a comprehensive repair and installation on-site. Over 95% of our customers recommend our service, thanks to precise repairs and fast service. Your safety is our priority.
Part numbers:
• 4M0907379K – 0265956194 – 0265243009
• 4M0614517M – 4M0907379T – 0265956591
• 0265258765 – 4M0614517AH – 4M0907379Q
• 4M0907379N – 0265956312 – 4M0614517AA
• 4M0907379R – 4M0907379N – 0265956312
• 4M0614517AC – 8W0907379G – 8W0907379J
• 8W0614517K – 0265956241 – 8W0907379F
• 8W0907379D – 8W0614517J – 0265956312
• 8W0907379D – 8W0907379G – 8W0907379E
• 8W0907379J – 0265956241 – 8W0614517H
• 8W0907379M – 8W0907379D – 0265956659
• 8W0614517AA – 80A907379B – 80A907379
• 0265956658 – 80A614517B – 4K0907379P
• 4K0907379A – 0265956621 – 4K0614517R
• 4K0907379Q – 4K0907379F – 0265956622
• 4K0614517S – 4K0907379R – 4K0907379A
• 0265956621 – 4K0614517T – 4K0907379S
• 4K0907379F – 0265956622 – 4K0614517AA
• 4N0907379AL – 4N0907379P – 0265956451
• 4N0614517BJ – 4N0907379AG – 4N0907379P
• 0265956451 – 4N0614517BC
