Anti-theft Immobilizer problems
Anti-theft Immobilizer: Security system that prevents the car from starting if the ignition key is not the correct one.
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What is the immobilizer on a Jetta? Why does it fail?
Related problems:
See owner's manual
Top problems
Lost key had the ecm immobilizer delete process done
Volkswagen Jetta 2009 Sedan 139000 miles
After receiving the ecm I install it and the car runs but it stuck in limp mode and the cluster mph nor rpm wk jus a couple warning lights
Immobilizer active always showing in display
Volkswagen Jetta 2015 Saloon 200000 miles
Not working cruise control, not working digital speedometer,
1
1 report
No crank ,no start 
Solved
Volkswagen Jetta 2010 1.6 tdi 121000 miles
Went out to start the car and no crank and no start ,no lights on the dash or nothing ,had a look at the relays your ridden the starter relay and sprayed easy start in the air box and it started straight away so now not sure if electrical problem or it’s immobiliser any help is a massive help
1 report
So up to now,have changed the gateway module just noticed that their is no glow plug light at all on the dash and today put new battery in it,am beginning to think the ecu isn’t getting power of someone could help would be appreciated
Best answer (according to John)
ANDRE VIEIRA from other 10 months ago
I believe it is the comfort module, it is located below the driver's panel. I am having the same problem and need to replace it.
Ok my 2010 jetty started with the driver side back brake light being on bright. Changed everything in the light assembly. We'll my battery gets drained if I do t unplug it. When I start my car nothing works. O electrical like radio windows, turn signals, brake lights nothing but my parking lights work. I need some help here bad. I tore my motor apart like 3 times, the inside of my car is taken apart. Ne ideas or if ne one has had the same problem n got it fixed can u explain this for me. Ne help will be appreciated very much. Its been like a year now. .
Turns out was a bad ecu had it opened up no sign of damage but was white crystals on the metal cover so water damage had the ecu changed and replaced with second hand one first turn of the key it started now misfires with a leaking injectors seal cylinder 2 the joys
When a had a look at the car a think the problem is the ecu in the uk spec sits underneath the windscreen wil the plastic panel on top that the wipers attach to and mines had a crack directly above the ecu area so just over time water must have got in what about your car is your ecu in the same place USA spec ?
Comment2021 vw jetta 1.4 tfsi No cranking
Volkswagen Jetta 2021 1.4 tsfi 63000 miles
Doesn't crank. All the fuses are good. Battery is good 12.6 volt. No cranking at all. I hooked up the ECU from another jetta, same result. Looks like whether immobilizer issue, or ignition switch, or ground wire.
4 reports
I get a fast clicking (dash lights flash in sync) with no motor turn.
Justyouritguy from South Africa 7 months ago
Have you tried checking the relay? I'm new to ecu's came from an IT and electronic background. Done a bit of mechanical work in my days.
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