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[TheBoy]

I'm guessing from the above posts, that the  battery in your fob has failed. 

Renew the battery & hopefully the cental locking will work.

Do a reset  on the door locking by sitting in the car with ignition on II & press the locking button on the fob & all doors should lock & then unlock .

Remove key from ignition  . . . . then using the fob, operate locking again to lock ( you can do this from inside or outside the car)   . . .

Then operate to unlock  . . . then  put key back in ignition & it should start hopefully 

Had this happen on my last 2.6    but can't remember who advised this solution  . . . but it worked

Sounds crazy . .  . but worth a try 

The immobiliser and central locking/alarm are two entirely independent things (on post 1995 Omegas), each with their own ECU.  The fob is 100% purely for CL/Alarm, and plays no part in the immobiliser function. Therefore a flat/missing fob battery will not cause an immobiliser issue, though will set off alarm is you have to unlock/open car with mechanical key.

Hope that clarifies

[powerslinky]

I'm guessing from the above posts, that the  battery in your fob has failed. 

Renew the battery & hopefully the cental locking will work.

Do a reset  on the door locking by sitting in the car with ignition on II & press the locking button on the fob & all doors should lock & then unlock .

Remove key from ignition  . . . . then using the fob, operate locking again to lock ( you can do this from inside or outside the car)   . . .

Then operate to unlock  . . . then  put key back in ignition & it should start hopefully 

Had this happen on my last 2.6    but can't remember who advised this solution  . . . but it worked

Sounds crazy . .  . but worth a try 

The immobiliser and central locking/alarm are two entirely independent things (on post 1995 Omegas), each with their own ECU.  The fob is 100% purely for CL/Alarm, and plays no part in the immobiliser function. Therefore a flat/missing fob battery will not cause an immobiliser issue, though will set off alarm is you have to unlock/open car with mechanical key.

Hope that clarifies

Just thought this may be worth a try TB as it sorted my last 2.6 MV6 when this imobiliser problem occured.

I also understand your knowledge of this sort of thing is second to none  . .   but  . . .

It also worked and got  Toledodudes car  started when I instructed him over the phone ( although that one did go on to have a major ECU breakdown in the end )

I understand that the key fob battery has nothing to do with this but ..my point was that the OP cannot do a re set of central locking when the fob will not work.

Cure for mine was : ignition on  . . . press lock on fob  to re set  . .  doors lock & then unlock (re set )  then remove key . .

lock doors again with fob with key in your hand  . .  then open doors with fob in your hand .

then car started

As said sounds weird  . .  but it has worked on 2 cars to my knowledge.

For the life of me I cannot remember who on Oof suggested this 

Must be worth a try for the cost of a fob battery

[RileyRomius]

Well ironically my fobs buttons don't work and the circuit board is mangled, however we unplugged the immobiliser and central locking and still not firing. Possibly an ECU fault? My friend has a computer with the software that can talk to the car but his battery just died  if it is the ECU, any suggestions?

[TheBoy]

If you unplug the immobiliser ECU, it definitely won't start.  The engine ECU has to see a valid, coded signal from the immobiliser before it will fire

[RileyRomius]

Ah I see! Well that explains that. Another update, we found a broken fuse which ended up being the fuel pump fuse. We replaced it but it's still got the same problem and I can't hear the fuel pump starting up. Do I have to reset the ECU or anything once I've replaced a fuse? Any ideas?

[TheBoy]

Are you still getting flashing EML? If so, the engine ECU is not getting permission to start from the immobiliser.

[RileyRomius]

Yes the dash light is still flashing as it was. Okay, so I'm guessing that the immobiliser is keeping the fuel pump from starting and thus that's stopping the engine from firing? Any suggestions on how to fix it?

[TheBoy]

Fix the immobiliser issue

Either:
1) The immobiliser is not seeing the correct (programmed) transponder
or
2) Irrespective of 1), the immobiliser ECU is not passing the right code to the engine ECU

[RileyRomius]

Right another update, I've checked all around the ignition barrel and that's all intact, the relays look fine and there is nothing I can see wrong with the immobiliser except excessive wear around the key switch. We couldn't get the ECU to talk to an external OBD unit so we couldn't diagnose any fault codes or anything. We even tried supplying the fuel pump directly from the battery and and starting it like that but still no luck even though she coughed with easy start.

[TheBoy]

Right another update, I've checked all around the ignition barrel and that's all intact, the relays look fine and there is nothing I can see wrong with the immobiliser except excessive wear around the key switch. We couldn't get the ECU to talk to an external OBD unit so we couldn't diagnose any fault codes or anything. We even tried supplying the fuel pump directly from the battery and and starting it like that but still no luck even though she coughed with easy start.

Oh dear. Don't ever, ever EVER use that shite, unless you want your engine destroyed. Even after very few squirts.


You **NEED** to get the immobiliser ECU read as you are convinced the correct transponder is in place. Dicking around with anything else will **NEVER** get it running. End of. Simples.

[RileyRomius]

Haha okay fair enough  I'm going to drag it to a Vauxhall garage at some point and see if they can make some sense out of it.

[TheBoy]

If you posted you location, there may be a local member willing to cast an eye over it first

[powerslinky]

Haha okay fair enough  I'm going to drag it to a Vauxhall garage at some point and see if they can make some sense out of it.

Be sitting down when they give you the estimate/quote    and that will be without a definate fix IMO 

As TB says , post up your location & an oof member may be able to help or at least advise first off 

[flyer 0712]

i had the same trouble light on dash flashing when trying to start and a member said check the key for the chip...and sure enough when the battery was changed chip was lost but had a spare key and all was ok.............but you say yours is in there and ok......you also say that you have checked with a code reader,was it a proper code reader or a cheapie one off the net....the reason I ask is the cheapie one I used would not read mine at all whereas the proper reader did the job ok..

[deviator]

Haha okay fair enough  I'm going to drag it to a Vauxhall garage at some point and see if they can make some sense out of it.

Sign up for 25% off straight away I'd advise you to get the quote first, then mention the discount. The details are emails over so you can print and off you go.