Question about 2007 Chevrolet Silverado 2500HD

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Signal wire to starter in and out. starter ok. showed code po513 went back to dealer had computer reprogramed. still doing same thing. intermintted problem so hard to detecked.

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Your truck has the infamous Passlock anti-theft system. The ignition key has two small black rectangles with a small wire running down the length of the center on either side of the key shaft. When you insert the key into the ignition lock, the wires in the small black rectangles contact a sensor in the lock cylinder. These sensors complete a path to the Electronic Control Module (ECM), which tells the fuel and starter circuits to engage. If the key wires or lock cylinder sensor are damaged or dirty, the signal is not sent to the ECM, your truck will not start, and it may even die while running. The dealers remedy this by selling you a new ignition lock cylinder, and they cut a new key with the proper value to match the old key. This will run you $500 to $600 or more. There are ways to bypass your Passlock system, and several are detailed in Youtube videos. I'd suggest watching a few of them and determine which bypass method works for you. Good luck.

Posted on Oct 11, 2013


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The dealer should have a part number for the complete wiring that you need, but it may be a main harness which may require many hours to replace.

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My 2006 stratus waht start i have changed the Dis cap, wires, alternator and spark plugs. the battery is new and the sensors r good it fires but not turning over could it be the starter.

is the starter getting power and ground and a signal from the ignition switch is the security light blinking or staying on? hook up a scsntool and see if you can read the data from the pcm if you can't check the fuses #14 i think try a differant key anything more and probably you need to tow it to a dealor if you got po513

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PCM Processor Fault. A couple of things, check the wiring around the PCM, check for frays in the wiring. There is a Technical Service Bulletin for this problem also, where your pcm would need to be re-flashed (computer update) by the dealer, I believe it's around $100 to do this.

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Ok here is my problem... my check engine light is still on after they fix the problem.. the guy say I need the evap system reprogram where is that

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2003 dodge caravan won't start

My 2003 dodge caravan would not start after driving about 1/2 hour. I stopped for coffee and when got back in to start it started I switched gears and it stalled. I tried to start again switched gears then it started but only for 2 sec. No clicking, no cranking sound just would not start but battery functions were great. Spent 2 days with a mechanic who could not resolve so sent to Dodge. After a day of putting wires back and checking out the problem they said it was the computer. Said that it was bad and could be replaced at no charge due to malfunction. Yes, it worked fine afterwards no more problems. They also said that some of the computers are found to be defective like this one so I hope this helps you in the right choice to have the dealer check it out if you are unable to get a computer reading and there is no obvious short in the system. Free sounded very good but as you know there is no such thing as really free as they got me for other things $350 worth. ouch!

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Remote signal is not being received/responded to. Fuses and remote batteries OK have also tried reprogramming using valet key and get no flash from lights.

I had the same problem. I went to the dealer though because my blinkers were not working but the hazards were so I knew the lights were okay. It turns out there was an issue with some realy switch in the hazards. Once that was fixed then all of a sudden my remote signals came back to life. TRy that, good luck.

Nov 06, 2008 | 2003 Audi TT

1 Answer

Service Engine Soon


A couple of things you can try:
  • remove the negative battery terminal to reset your car's computer. There are some car stereos that would require a security code when the battery is removed;
  • on your next fill up, try if you can get a higher octane gas instead of your normal, say if you use to put in 91, shift temporarily to 95;
  • add a can of injector/carb cleaner in your gas tank;
  • on a long stretch, drive aggressively and hard. The idea is to clean your fuel system, combustion chamber, valves, exhaust manifold, catalytic converter, exhaust system including your EGR and O2 sensors.
If error indicator persist, trace the EGR wiring with special attention to the connectors at the ends.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Aug 17, 2008 | 1997 Ford Thunderbird LX

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