• Vauxhall Astra H / Vauxhall Corsa D – engine non-start after replacement of the battery or the charging of a flat battery.
  • The vehicle is showing fault codes P1632 – P1678 – P1679 – B3925 – B3929 – B3977
  • Vauxhall Astra and Corsa models affected by this issue were built between 2004 and 2010.
  • The management light will blink continuously in addition to the engine non-start.

The Vauxhall Astra spanner warning light illuminates when the ignition is on – usually, it should turn off within seconds. If it illuminates while the engine is running, this indicates a fault with the engine or transmission management system. This might also cause the powertrain to run in ‘limp home mode’ or ‘emergency mode’.

When the spanner symbol flashes continuously there is a fault with the immobiliser system which will prevent vehicle from starting. When scanned with a diagnostic machine, one or more of the following code may appear

  • P1632 – Wrong Transponder Key
  • P1678 – ECM (Engine Control Module) Identification Failed
  • P1679 – Wrong Environment Identifier Received BCM (Body Control Module)
  • B3925 – Wrong Environment Identifier Received IPC (Instrument Cluster)
  • B3929 – Wrong Environment Identifier Received SDM (Airbag)
  • B3977 – Wrong Environment Identifier Received ECM (Engine Control Module

This fault is caused by a software glitch – data from one or more control units has been corrupted due to low voltage rendering in mismatched communication data that’s being transferred between modules responsible for vehicle security – so the signal that authorizes engine start is being blocked.


We have the solution to your problem. With our advanced diagnostic and programming equipment we can reprogram and realign immobiliser modules to restore the functionality of your vehicle. Our main dealer-level equipment allows us to perform such services at your convenience without the need for vehicle recovery. We will come to you and can service all areas within London, and even some outside of London too.

The car will also store some or all of the following fault codes:

  • P1632 – Wrong Transponder Key
  • P1678 – ECM (Engine Control Module) Identification Failed
  • P1679 – Wrong Environment Identifier Received BCM (Body Control Module)
  • B3114 – Remote Key Not Synchronised
  • B3925 – Wrong Environment Identifier Received IPC (Instrument Cluster)
  • B3929 – Wrong Environment Identifier Received SDM (Airbag)
  • B3977 – Wrong Environment Identifier Received ECM (Engine Control Module)

This fault occurs when attempting to start the vehicle with a flat battery.
What does the fault mean?
When attempting to start the vehicle with a flat battery the BCM (Body Control Module) has insufficient power to perform its functions and so the data held on this module becomes corrupt. Now, with the data corrupt, it can no longer communicate correctly with the other modules in the car. It sees the BCM as an ‘unmatched part’ and considers this a security risk – the vehicle is now immobilised.

  • BCM – The Body Control Module is responsible for multiple functions on the vehicle – the immobiliser, remote central locking, windscreen wipers, headlights, indicators etc…
  • ECM – The Engine Control Module is responsible for monitoring and controlling all major aspects of the engine – fuel, air, ignition etc…
  • IPC – The Instrument Cluster contains your speedometer, rev counter and dash warning lights (the part behind your steering wheel).
  • SDM – The Airbag Module is a safety module controlling your airbags.
How do I fix the problem?

Genuine Tech 2 Vauxhall diagnostics are needed to fix this issue. The BCM (Body Control Module) must be reset and reprogrammed to match the other security modules within the vehicle.

Does my car need to go to the main dealership?

No! We have genuine Tech 2 diagnostics and can fix this problem for you in no time at all. We have fixed this common problem many times already.

telEmergency? Call 0203 393 5669


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It couldn’t be easier to arrange a visit to get new car keys or duplicate car keys for your vehicle. A member of our team will be happy to take your call and to schedule a visit with you. We cover Greater London and surrounding M25 areas, solving all broken, lost, spare car keys and other issues.


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About Us

Car Keys Solutions is a reputable, trusted and reliable car locksmith in London, providing emergency car key replacement, car key programming and electronic fob replacement from 8am to 10pm 7 days a week.

What we do and where can you find us

We provide a mobile car key replacement and car locksmith service in London and surrounding M25 areas at highly competitive prices compared to the main dealerships. Our main HQ is in Finchley, North London. Our mobile service covers areas across the M25 including North London, West London, Central London and East London.

We’ll meet you wherever you need a mobile key replacement service – at home, at work or anywhere else across Greater London.

Simply call when you need us for a mobile car key replacement service with a 1-hour callout response.

Why Choose a London Car Key Replacement Service?

Choosing a local service for car key replacement ensures that you can be reached quickly and easily when you need a fast service. We provide a service for emergency callouts and we know the London streets so well that we can plan the best route to get to you quickly. If you’re running late for work, locked out of your car at the supermarket or trapped at home, why wait for a replacement car key when there’s a faster solution?

What Are the Benefits?

  1. Lower Cost (main dealerships will charge more)
  2. Convenience (a main dealer will ask you to bring the car to them when we’ll come to you instead!)
  3. Speed (why wait days when we can be with you on the same day?)
  4. Ease (it couldn’t be easier to book – it takes just one quick click!)

Emergency Car Key Replacement

It couldn’t be easier to benefit from emergency car key replacement. From our base in Finchley, North London, we provide our service across most parts of London with a dedicated car key helpline. If you’re locked out of your car, with no spare key, then we’ll be with you in just one hour. We can create duplicate car keys on your driveway or out and about, for a hassle-free experience.

Get emergency car key replacement with no call out charge. You can book a visit by phone in a matter of minutes. A mobile emergency car key replacement will not only save you money compared to dealership houses but will also save time (and your day!).

Why Choose Mobile Key Replacement from Car Keys Solutions?

There are many ways to get a new car key, or key fob, for your vehicle. You can visit a locksmith or car key replacement provider, or you can go to a main dealership, but you’ll need your vehicle with you. If you can’t access your car, these options will require you to have your vehicle towed to a garage or alternative location.

With our mobile service, there are no extra costs for you. We’ll meet you wherever your vehicle is to provide your replacement car key on the spot. All at a price that you’ll love.

All Car Makes & Models

Whatever the make and model of your car, get a new car key or replacement key fob that is connected to your vehicle’s computer system.
All data for old key fobs will be erased from the system so that nobody can use an old key to gain access to your vehicle. You’ll get a brand new car key and can rest assured that the old one is no longer of worth to anyone that might have found it.
With the very latest technologies and the best available equipment, you can be assured of a fast and convenient service for all car makes and models.

Are There Any Risks?

None at all! We’ll gain access to your vehicle safely and without causing damage and can create a new car key quickly and efficiently with a guarantee that it’ll work. Of course, you’ll be trying it out before we’ve left or you’ve driven away!
Your car won’t be worse for the experience and our fast and reliable service ensures minimal stress for you and your passengers.