Issue
- 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.
What does the SPANNER WARNING LIGHT mean on a Vauxhall Astra or Corsa?
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.
SOLUTION:
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.
Call us today to see how we can help.
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)
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 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.