Why does transmission not up shift into fourth gear?

Asked by Jan 18, 2015 at 10:36 PM about the 2004 Mazda MAZDA6

Question type: Maintenance & Repair

MT light in dash is on.  Replacing sensor made no difference

2 Answers


Do you mean AT light? Did you clear the codes after you replaced the sensor? If so, it might be a burned overdrive band requiring a rebuild of the transmission. Have it properly diagnosed before spending big $$$$.

Thanks for your response. We're OK now that theTCM was replaced.

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