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Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23821
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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05 F250 Super Duty 4x4, 5.4 tritan Towing a Toyota pickup on

Customer Question

05 F250 Super Duty 4x4, 5.4 tritan
Towing a Toyota pickup on a trailor from Mosouri to Fla.Have gotten toMacon ,Ga. An the tow haul light has started flashing. Temp on trans is fine, trans fluid is bice an pink, not low. Didnt exceed 65mph all way here with tow haul ingaged. Has tact fluctuating slightly. Already replaced speed censor on rearend about an hr ago. Shifting seems ok. Baffled. Any sugestiins
Submitted: 10 months ago.
Category: Ford
Expert:  Mike S. replied 10 months ago.

Hi, I am Mike, welcome. I'm reviewing your question.

Expert:  Mike S. replied 10 months ago.

What happens if you switch the tow mode off? And then back on?

Customer: replied 10 months ago.
It just stays flashing, you can feel the over drive kick in but the rpm fluctuate an feels as if it comes in an out of over drive even with tow haul off. The light on dash never quits flashing. When you put it back in tow haul mode rpm stays about between 2500 an 2250 like its dropping in an out of 4 an 5 gear.
Expert:  Mike S. replied 10 months ago.

I just got done reading when the tow/haul switch is on, the transmission isn't supposed to shift into overdrive. Anyhow, I believe the next best step is to have the trouble codes retrieved from all of those modules.

Expert:  Mike S. replied 10 months ago.

I had like 87 results when searching for codes referring to tow, so unless I know the specific code, I have nowhere to start.