Vauxhall immobiliser and flashing padlock faults
Car won't start and a padlock is flashing on the dash? Here is what to try now, and how Eddie can sort it where the car is sitting.
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Stuck on the drive?
What the light is telling you
The immobiliser stops the engine unless it recognises the key. Depending on the car, a problem shows as a padlock symbol, a key message, or a flashing engine management light. The engine may crank and die, or do nothing at all.
Try these first
Use the spare key
The quickest test there is. If it starts on the spare, the first key is the likely fault.
Change the fob battery
A flat battery stops the remote buttons. On a keyless car it can stop the start as well, and your handbook shows where to hold the fob as a backup.
Check the car battery
Dim dash lights or clicking point to low voltage, which can throw up strange immobiliser behaviour. A jump start may be all it needs.
Then stop trying
Repeated cranking drains the battery. Leave it, and ring.
When the simple things fail
Common causes
A chip inside the key talks to a reader coil around the ignition, or to aerials on a keyless car. That reply passes through the body electronics to the engine ECU. A cracked chip, a damaged coil, a wiring fault, or a module that has lost its match can each stop the car.
Fitting a replacement module is another common trigger, as parts must be matched to each other. Generic codes on this subject include P0513, incorrect immobiliser key, and P0633, immobiliser key not programmed. See ECU faults if that side of it has been mentioned.
Before you book a tow
Sorted on the spot, if possible
A car that won't start is where a mobile specialist helps most. Eddie brings specialist key programming equipment, has access to Vauxhall security codes, and carries out immobiliser synchronisation on site. So a tow to a garage may not be needed. If a key is the cause, keys and remotes has the detail.
Hours
When you can reach Eddie
Mon to Fri, 08:30 to 17:30
Mon to Fri 08:30 to 17:30, not 24 hour. After hours, text the reg and where the car is. If you are somewhere unsafe, or on a live road, call your breakdown provider.
Why is the padlock flashing?
With the ignition on, a flashing padlock usually means the car has not accepted the key. Flashing while the car is parked and locked can be normal, as that is how many cars show the alarm is set.
Is it the key or the car?
Try the spare. If the spare starts it, suspect the first key. If neither works, the fault is more likely on the car.
Can it be fixed on the driveway?
Often, yes. Eddie comes to the car and can diagnose immobiliser faults, supply and programme keys, and carry out immobiliser synchronisation on site.
Do I need a tow?
Not always. Ring Eddie before you book one, as the car may be able to stay where it is.
Mon to Fri, 08:30 to 17:30