Question about 2001 Saturn SL

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2001 Saturn Immobilizer problem

Every so often I go to start my car and I have problems getting to stay running. I turn the key and the engine kicks on for a second then shuts off... The little security light comes on and it usually takes over an hour to get it to start. Ive checked the battery, spark plugs, spark plug wires, and all seem to be fine.

How can I fix this problem? Do I need to get my ignition re-keyed? My key is worn down, is that causing the problem?

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I was having the same problem with mine. It would start and then miss badly and chug...then stall. I ended up replacing the crank position sensor, a cheap part at autozone, easy to swap too...loosened 2 bolts and 1 connector and swapped it. Its on the backside of the motor dead center just below the cylinder head, good luck

Posted on Mar 04, 2009

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How to start a 2001 Volkswagen Jetta after replacing the battery.


If your car has the yellow car key symbol on the instrument cluster when you turn the key to on shown activated below it has an If your car has the yellow car/key symbol on the instrument cluster when you turn the key to ON shown activated below it has an immobilizer This light comes on for a second but quickly goes out when turning the car on and all is normal If it stays on you have an issue immobilizer This light comes on for a second but quickly goes out when turning the car on and all is normal If it stays on you have an issue

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Immobilizer light stays on engine won't start


Make sure the key isn't on a keyring, and if you have a spare key try holding it against the ignition barrel whilst trying to start the car. Failing that, it's an auto electrician job. China OBD2 car diagnostic tools wholesale on CareUCar

Mar 20, 2014 | 1996 Jeep Grand Cherokee

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2001 vw passat...its starts up and then shuts off within 2 seconds...imobilizer light comes on...when car sits for a while its starts....but then it will not start intermitantly again? help!!!


You have an electronic immobilizer key recognition problem. Your key chip is not recognized by the transponder antenna fitted on the ignition switch barrel. Do you have this warning symbol lightning on the dashboard?

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This warning lamp indicates that the engine is locked by the immobilizer system, and the engine start sequence must be repeat again.

From year 1995 in Audi-VW (VAG) cars is used engine immobilizer. The VAG group immobilizer system consists of an immobilizer ECU which controls the recognition of keys and the Engine Management ECU system. Immobilizer is activated when the ignition key is removed and, together with the engine control unit, largely prevents unauthorized starting of the engine. The system uses a transmitter and receiver unit in the ignition key (transponder). Whenever an attempt is made to start the engine, it transmits a new code to the car's electronics. The immobilizing is only cancelled and car motor electronic receives permission to start engine if the key sends a right authorization code.

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Use another ignition key that you have, and start the engine.


You will need to programm all ignition keys using suitable diagnostic equipment (VAS, VAG-Com) connected to the data link connector of the car.

Aug 31, 2011 | 2001 Volkswagen Passat

1 Answer

I have a 2001 saturn sl. the car just turned off and the oil pressure light turned on. Now the car wont start and the light continues to stay on. the car has oil.


you are looking at two unrelated things. when the car died, the oil pressure dropped off causing the light to come on. this is normal. when the key is on but the engine is not running, there is no oil pressure so the light will be on. dont be concerned about the oil light and start diagnosing your no start.

Nov 24, 2009 | 2001 Saturn SL

2 Answers

I have green key flashing on dashboard but wont start


Check Fuse #9 under the hood its for DLC Power and Immobilizer System (10 Amp).

Look at the TDC wire harness. Sometimes the wire isnt put back in the holder on the rear edge of the timing cover. Then the harness gets sawed in half by the alternator belt.

Other Honda user had this problem on his 2005 Accord, after letting it sit battery disconnected for 20 minutes it was just fine. Inmobilizer for the lose.

My guess is your immobilizer kicked in because your battery in your key is dead.

So, I dont warranted if this process work...
Here is a better understanding of how a immobilizer works; each key has a code imprinted on it, no battery of any type just a random code. When you go to start the car the immobilizer computer sends a signal to the key. If the signal it receives back from the key matches one of the 5 keys it keeps in its memory, it sends a "OK start" message to the PCM starting the car. If it doesn't see the "OK start" signal it doesn't start and the green key light in the dash flashes. In short there is no way to reset it.

Try another key. If not, there is a way to bypass it shortly to get the car to a Honda dealership for reprogramming of a key or key replacement. Your Prelude may also have a problem with one of these components. It will need to be hooked up to a Honda scan tool and checked for immobilizer codes.Let me know if you have any questions. I'm a 6 year factory Honda tec.

I will try and answer all I can.Here is how to use the "pcm brake code" You weill need to call your local dealership and give them you vin # to get the code.To start the engine, follow this procedure:
1. Cut a temporary key using the key code and anon-transponder key blank.
2. Turn the ignition switch ON (II) with thetemporary key.
3. Enter the first digit of the immobilizer brake codeby pressing and releasing the e-brake pedal the samenumber of times as the digit. For example, if thefirst digit is 4, press and release the e-brake pedal 4 times.
4. Turn the ignition switch to Lock (0) and then backON (II).
5. Repeat steps 3 and 4 to enter the second, third,fourth, and fifth digits of the code. You have up to30 seconds to enter each digit.
6. After you enter the fifth digit, the immobilizerindicator on the dash will blink five times,meaning you can now start the engine with thetemporary key.While the engine is running, the immobilizerindicator will stay on. If the engine isn't started with in 10 minutes, you'll have to reenter theimmobilizer brake code. You'll also have to reenterthe code if the engine is shut off for more than 10 minutes.This also workes for any Honda immobilizer system. However you need to use the brake pedal. Only preludes you used the e-brake.

Good luck.

Nov 13, 2009 | 1996 Honda Civic

1 Answer

Starts but does not keep running


Sounds like the immobilizer. Does the key light in the dash stay on when you turn it over?

Immobilizer is the code that the key has (it's actually a radio frequency identification or RFID chip). If the key code doesn't match the car code, the car will turn over but won't stay running.

If this is the problem, you'll need to take the car to a dealer to get the key recoded.

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1 Answer

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Many cars these days are equipped with an immobilizer. (you can find more information about the immobilizer in your owner's manual). The immobilizer allows the engine to run only if the correct key is used. If your car has an immobilizer, you probable see a "Security" or Key-shaped light coming on on the dashboard every time you turn the ignition ON. If this light is flashing when you turn the ignition ON, it could mean that there is some problem with an immobilizer or the system does not recognize the key. If the immobilizer doesn't recognize the key, the engine wold not start at all, or would start and then die in few seconds.
You can try a spare key, if it won't work, your dealer is the place to call. Sometimes, the key is just need to be reprogrammed. On some cars you can find the information how to reprogram the key in the owner's manual.

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