Join Date: Mar 2018
Location: Southern Illinois
Feedback Score: 0 reviews
Check Gauges/Tow Haul lights flashing
I have a 2004 F250 6.0 L , the Check Gauges light and Tow Haul light come on and flash when I start up cold, trans temp gauge works normal, then when I start driving the transmission operates in the safe mode, shifts very erratic, till things warm up, then everything operates normal. I changed out the TFT sensor, both trans filters and trans fluid, without any effect to the way things were operating. then I went to a friends shop put the truck on a lift and went through all the wiring harness looking for anything out of normal, chaffing, connectors loose, anything obvious, nothing found, then took truck to a transmission shop to see what they could find, they went through the wiring, checked the sensor operation, solenoid operation, voltage readings, 5v was good, everything was pointing to a PCM problem, possible Vref loss in the PCM, ordered a PCM from a company in NC, it was promised for 5 business days, 21 days later it showed up, installed per their procedure, truck when in drive was in 4th gear only no shift and tow haul light was flashing, I'm thinking they had programed it wrong, returned it to them for a refund and went elsewhere. Took my PCM to a shop that specializes in PCM repair, they have it on their bench now for evaluation, in the mean time I'm trying to find other possibilities but I am at my wits end, looking for help or advice. Also I did check and clean the battery ground to frame connections.