2006 Uplander. Transmission in and out of lockup.

Discussion in 'Chevy Uplander & GM Minivan Forum' started by Chillz1, Jun 30, 2014.

  1. Chillz1

    Chillz1 New Member

    I have a 200) Uplander with the 3.5 engine. It has 135,000 KMs. When cruising at app 100kph, the transmissions torque converter is routinely going in and out of lockup ( alternating between 2000rpm and 2100rpm) It will do this back and forth every few seconds. Sometimes as long as five seconds or so. If you push the van up to 110-115kph The converter seems to stay in lockup and only comes out when climbing a rise. Is this normal. Or a sign that there's a problem?
  2. gmvanguy

    gmvanguy New Member

    Do you have a knock sensor code? If so... It might not be the transmission. I'm not saying it's not... it could also be the friction rings in the transmission... do you a check engine light on? If so... take it to an auto parts store that reads the codes... some will print them out for you. Then post your results or google for yourself.

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