Question about 1999 Cadillac DeVille

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98 Chevy Pickup - Error code 740

The truck acts like the fuel pump quits working - It has been replaced

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  • turningpo122 Dec 15, 2008

    Problem solved! Thank you very much!

  • paul swallow May 11, 2010

    need to know the year make model and engine size

  • yadayada
    yadayada May 11, 2010

    your year of truck uses codes that have a letter and four numbers, this is not a code.

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  • 21 Answers

0740 means torque converter clutch circuit malfunction...

Posted on Dec 23, 2008

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02 sensor is not you main problem.
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Is it dead now or just acting up?

Pull the throtle body and replace the base gasket to start with.
Clear codes and see what comes back.

Check fuel pressure when it quits.
Post back fuel pressure readings.

Get some good repair info on the code for fuel pump relay and fuel pump and fuel pressure.
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