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Matt, Mechanical Engineer
Category: UK Car
Satisfied Customers: 21599
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Vauxhall astra central locking failed cant get the fuel cap

Resolved Question:

central locking failed cant get the fuel cap open
Submitted: 6 years ago.
Category: UK Car
Expert:  Matt replied 6 years ago.

Can you get into the rest of the car and the boot?
Customer: replied 6 years ago.
cant get into boot or fuel cap manual switch is contstantly on on the dashboard
Expert:  Matt replied 6 years ago.

I'd try resetting the ECU by disconnecting the battery cables and clamping them together for 10 mins. Remove both battery leads from the battery then use a nut and bolt or G-clamp to hold both battery lead terminals together.

This discharges any capacitors / memory within the ECU and around the car so ensures all memory settings are wiped clear - back to the factory default.

This will reset all the systems on the car and you'll need the radio security code to get it going again, and ensure that the keys are in your hand when you re-connect the battery as the car may lock and turn on the alarm

If you still can't get the filler cap open then I'd suggest going into the boot by folding down the back seats so you can at least pull the fill cap manual release tab and get some fuel into it
Customer: replied 6 years ago.
what does the fill cap manual release tab look like i can only see a black cable?
Expert:  Matt replied 6 years ago.

It may be tucked behind the trim on the same side as the filler cap but it should look like this:
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