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Navard Morrison
Navard Morrison Posted on Jun 15, 2014
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2005 Cadillac Deville revving to 4000 rpm and not shifting

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Dennis Tomlinson

Dennis Tomlinson

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  • Expert 143 Answers
  • Posted on Jun 16, 2014
Dennis Tomlinson
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Problems with speed sensor for transmission. Computer uses a speed signal to shift transmission through the gears. Without speed input, the computer doesn't know when to shift the transmission. Either the speed sensor is bad or wiring from the ECM to the speed sensor is bad. Usually 2 wires lead to the sensor. The sensor generates a AC voltage signal with higher speeds generating more voltage and frequency. The ECM (computer), looks at the signal to see how fast the vehicle is traveling.

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Jan 03, 2016 • 1994 Cadillac DeVille
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May 13, 2014 • 2000 Cadillac DeVille
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My van shifts fine at low speed but when I go fast the rpm go above 4000 before shifting
the farther you press the gas pedal the higher the rpm will go before shifting. if you floor it it will redline before shifting. if it isn't shifting at the right time it could be the line pressure needs to be adjusted
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Mar 24, 2013 • 2005 Chrysler Town & Country
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My 2000 cadillac deville will not shift into overdrive. throws no codes. what could be wrong? thanks for your time.
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Mar 11, 2010 • 2005 Cadillac Deville
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Nov 07, 2009 • 1996 Cadillac DeVille
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93 seville sts: engine revs, speed drops,
Probably not the ECM. Have it scanned. IF is is a 93 it means you have a 4.9 motor. They have a solenoid idle cotroll that could be malfuntioning, there could be a problem with the throttle position sensor, or maf, egr,mass air flow, You get the picture. The light is on to tell you what is happening. Most Autozones and Advances will scan it for free. Good luck.
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Aug 16, 2009 • 1993 Cadillac DeVille
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