Will not downshift

PHILIP CARDINALE

MEMBER
2001 CHEVROLET BLAZER
4.3L
6 CYL
4WD
AUTOMATIC
107,000 MILES

SUV will not downshift. I had a complete tune up now wont downshift. The mechanic says it is not the transmission or TCM or PCM. What else could the problem be?

Tuesday, November 15th, 2016 AT 6:45 PM

3 Replies

KOOLCADDY6

MECHANIC
60 POSTS

Was your mechanic able to see if there is any codes in the system? Check the wiring on the TPS sensor or map/mass sensor. It is possible it may have got disconnected when he did the tune up. Since it started after he did the tune up.

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Tuesday, November 15th, 2016 AT 10:05 PM

PHILIP CARDINALE

MEMBER
1 POST

Before he did the tune up it was bogging down. The plugs were shot and wires bad and it was running on only five cylinders. He did replace the four wheel drive control module before that. It is not throwing any codes. Any other ideas? Thanks

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Wednesday, November 16th, 2016 AT 7:39 AM

MHPAUTOS

MECHANIC
31,937 POSTS

A live data feed will see if the shift solenoids are actually working, you will have to get a quality scanner to see if you have live data read out on this model.

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Thursday, November 17th, 2016 AT 3:52 AM