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Giving code 601 - 2002 Chevrolet TrailBlazer

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This is a memory error. Have the code erased and see if it comes up again. If it does then the ECM is bad. this can also be reset by disconnecting the battery for 30 minutes. But I am sure you will have to have the code erased.

Posted on May 18, 2011

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Internal module check sum error You will probably need to replace your ECM It should cost around $100-$150 at autozone or oreillys

Posted on May 18, 2011

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Error code P0601


Depending on the make model and year, code 601 usually means there is an internal problem with the engine computer.

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601 is internal memory code.
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2001 jeep grand cherake limeted 4.7 motor I instaled new timing chain kit after all back together it was hard to start but started and drove like new parked it 2 days later it would not start giveing me a...


601 is code for main computer...Check harness to make sure that it's connected well and that pins are clean and straight. Try swapping it out for a known good one if you can. Don't know why it went down like that but that's what the code says...got to believe it sometimes! I'd also check around where you were working to make sure you haven't pinched or disconnected any wiring (doubtful)
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