When I turn off the key, everything shuts off, except the engine keeps running


Asked by Sep 23, 2013 at 08:27 PM about the 2005 Ford Taurus SEL

Question type: Maintenance & Repair

I parked my car, turned off the ignition and pulled out the ignition key. All of the dash indicators turned off and the tach read zero, as usual. But the engine kept running. I pulled the positive battery cable and then the negative battery cable. Engine still kept running. Finally I  pulled out the PCM relay and the engine stopped. Any ideas?

8 Answers


Check your ignition lock cylinder and ignition switch, I suspect one or both are faulty. FYI: Pulling the battery cables off the battery won't usually turn the car off.

6 of 6 people found this helpful.

Thank you, Tom! I suspect that the cylinder doen't come with the switch, right? If the switch is bad, should I replace the cylinder (if it comes separately)? And which part causes new keys?

1 of 1 people found this helpful.

If your altinator is faulty pulling the battery cable will shut it down because you are not getting the voltage to run the ignition system sounds to like you have a feed back from some place. You can buy the whole ignition system as on unit or just buy the tumbler system I would buy as a complete unit . check the alternator and make sure you are pushing the right voltage and amps required. But tom is right all so. Check all connections to battery and grounds if dirty that could be where your feed back is comeing from. You will get a key with it but if it is chipped there will be alot more to it the emc will need to be reprogramed to that key

2 of 2 people found this helpful.

Sorry did not read your question completly through it may just be the PCM relay that is bad

5 of 5 people found this helpful.
Best Answer Mark helpful

Ronc258, you are correct! The shop mechanic replaced the PCM relay and everything works fine now! Thank you so much!

4 of 4 people found this helpful.

This is so weird....this happened to me too! My car's engine still kept running even after I pulled out the keys. I am hoping it's the PCM as yours was. How much did that cost you?

5 of 5 people found this helpful.

I think I paid about $15 at an aftermarket parts store.


What's a ppm and where is it located

1 of 1 people found this helpful.

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