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Vauxhall Corsa D – Car Won’t Start After Flat Battery – Immobilised – P1632 / P1678 / P1679 / B3114 / B3925 / B3929 / B3977

The Vauxhall Corsa D was made between 2006 and 2014, the problem I’m about to describe usually only affects the vehicles made in the earlier years of this time period (up to around 2009).

What are the symptoms of this fault?
The car will not start. You will also notice a flashing light on the dash – a car with a spanner through the centre (see picture below).

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 Synchronized
B3925 – Wrong Environment Identifier Received IPC (Instrument Cluster)
B3929 – Wrong Environment Identifier Received SDM (Airbag)
B3977 – Wrong Environment Identifier Received ECM (Engine Control Module)

When does the fault occur?
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 it’s functions and the data held on this module corrupts. Now, with the data corrupted, it can no longer communicate correctly with the other modules in the car – it see’s the BCM as an ‘unmatched part’ and considers this a security risk – the vehicle is now immobilsed.

BCM – The Body Control Module is responsible for multiple functions on the vehicle – immobiliser, remote central locking, windscreen wipers, headlights, indicators etc…

ECM – The Engine Control Module is responsible for monitoring and controlling all major aspects of your 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?
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 dealers?
No! We have Tech 2 diagnostics and can fix this problem for you in no time at all. We have fixed this common problem many times already.

How much does it cost?
We charge a rate of £120 – £200 within west London for this service, and slightly more if outside west London for extra distance for our mobile engineers to come out to you.

No hidden costs. Please feel free to give us a ring on 07903777584

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