CAS Module Repair

CAS Module Repair for BMW and Mini

Does your BMW or Mini have starting problems, keyless entry problems or a steering
lock fault? The CAS module (Car Access System) could be faulty.

At Ecumotorstock we specialise in the repair and reprogramming of CAS modules, restoring full functionality to your vehicle with a professional warranty.

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Precise diagnosis

We identify faults in CAS modules using advanced technology.

Professional repair

We restore the CAS for a safe and reliable start.

1-year warranty

Your CAS module repaired as good as new, backed by quality.

Reliable service

More than 15 years repairing vehicle electronic components.

What is the CAS module and why is it so important?

The CAS (Car Access System) module is an essential electronic component in
BMW and Mini vehicles. It controls critical functions such as:

Engine start
Recognition of electronic keys (Keyless Go)
Steering wheel unlocking (ELV)
Vehicle immobiliser
Communication with the DME/DDE

A fault in the CAS can prevent your car from starting, lock the access
system or even leave it completely immobilised.

Common CAS module faults: causes and symptoms

Main causes of failure

Flat or worn battery
It can cut the power supply to the module, causing errors or intermittent faults.
Programming or synchronisation errors
The CAS must be perfectly aligned with the engine unit (DME/DDE). If it is not, the car may stop starting.
Internal wear or electronic failure
Internal components damaged by age, moisture or voltage spikes can render the unit useless.
Electrical or connection problems
Short circuits, dry solder joints or deteriorated connectors hinder communication between modules.

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Symptoms of a faulty CAS module

The engine turns over but does not start
The car does not recognise the key
Central locking failure
Error messages on the iDrive
Warning light on in the instrument cluster
Error code in the electronic diagnosis

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Most common error codes in the CAS module

When we scan a BMW or Mini with a CAS fault, the most frequent codes are:

Code: A0A9 – Control unit: communication error

Code: A0AA – Internal module fault

Code: A0AF – CAS processor error

Code: A0BE / A0BF / A0C0 – Faults in the terminal 15 outputs (power supply)

These codes allow us to pinpoint the cause
of the fault and apply the right solution.

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BMW and Mini models most affected by CAS module faults

We have repaired hundreds of CAS modules in the following models:

BMW

1 Series: E81, E82, E87, E88
3 Series: E90, E91, E92, E93
5 Series: E60, E61
6 Series: E63, E64
7 Series: E65, E66, E67
SUV: X1 (E84), X3 (E83), X5 (E70), X6 (E71)

MINI

Mini One, Cooper, Clubman, Countryman, among others

If your vehicle is on this list and has starting or access faults, the CAS module probably needs checking or replacing.

Professional CAS module repair at Ecumotorstock

At Ecumotorstock.com we have:

✅ Technicians expert in BMW/Mini electronics
✅ State-of-the-art diagnostic equipment
✅ CAS module reading, cloning and programming services
✅ Fast solutions, with warranty and, in most cases, without the need to replace the whole unit.

We also repair or replace the ELV lock, reprogram new keys and synchronise the CAS with the engine ECU to avoid future faults.

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Contact us and bring your car back to life

Don't risk the security of your BMW or Mini. If you suspect the CAS module is
failing, write to us on WhatsApp, by email or call us directly.

We will advise you without
obligation and give you a quote straight away.

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Why choose Ecumotorstock?

🧠 More than 18 years in automotive electronics
️ Technicians specialising in Mercedes-Benz
📦 Nationwide service: collection and delivery with MRW
🔐 Repairs with a genuine warranty
⚡ A faster, cheaper solution than replacing the module