Check engine light came on and code read that solenoids needed to be replaced. Did that, tried to clear code but it came right back on. Tranny was slipping before and after replacing the solenoids. When tranny gets hot it does not go into 3rd and 4th gear, it has to be manually shifted. Took to mechanic who replaced ignition, ignition switch, thoroughly checked all electrial wiring and fuses/relays in vehicle. After two weeks of troubleshooting, he gave the yukon back to us in same condition without charge and a promise to try to find a way to fix the issue. He is still baffled! Only thing not done at this point is replacing the PCM. Would this possibly fix the issue? Any insight would be great. This was a perfect running truck before this happened.
Saturday, March 24th, 2012 AT 6:45 PM