computer code P1400 differential pressure low voltage. Fix?

2002 FORD EXPLORER
130,000 MILES
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JFLASH1234
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Flashing overdrive light on dash. Auto Zone code reader read P1400 code. Google said code equals differential pressure low voltage. Overdrive seems to work fine with no noticeable operational problems.
Sep 27, 2013 at 3:02 PM
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HMAC300
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locate the EGR control solenoid, take the vent cap off, plug the vent with your finger and that will activate the EGR valve without having a vacuum pump. if it does this then your dpfe sensor is bad.
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Sep 27, 2013 at 4:18 PM