Limp mode - transmission slippage

[ryano2121]

I have an 08 6.4L with Banks 6 Gun/IQ, CAI, exhaust. Otherwise stock.

My truck went into limp mode yesterday. IQ warning came up "transmission slippage detected". The Ford trans temp gauge was at zero and the IQ showed -68. As I drove, the trans temp gauges shot up to normal and it went out of limp mode. Then they dropped and it went back into limp mode.

I set the IQ to show trans slip - it goes up to the max after shifting into 2nd.

What is going on?

[K1LLsW1TchEd]

you might have a solenoid going bad in the trans or a temp sensor going bad in there

[ryano2121]

The temp sensor is only $20. Would it make sense to drop the pan and replace it?

[K1LLsW1TchEd]

The TorqShift transmission is actually designed to have some slippage which allows gear changes to feel smooth. If your truck just started this out of the blue then I would at least have it checked out by a mechanic to prevent further damage.

[NorthwoodsF350]

Guys, I'm new here and just bought my first 7.3 after the typical 6.0 nightmare that lasted a year. I'm very happy with my 7.3 so far, but today after warming up for 15 minutes (it was 16a degrees out) I took it 2 miles into town and my trans wouldn't get me past whats 15-20mph on the way home. Any ideas?

[K1LLsW1TchEd]

Originally Posted by NorthwoodsF350

Guys, I'm new here and just bought my first 7.3 after the typical 6.0 nightmare that lasted a year. I'm very happy with my 7.3 so far, but today after warming up for 15 minutes (it was 16a degrees out) I took it 2 miles into town and my trans wouldn't get me past whats 15-20mph on the way home. Any ideas?

you are better off in the 7.3 forums. however, it sounds like your trans temps needed to rise to allow oil flow to maximize. you may need a trans service as well.

[ryano2121]

My thread got jacked!

The trans slip is only happening in limp mode. And limp mode only happens when the trans temp gauges stop reading. So it might make sense that it is the sending unit?

[K1LLsW1TchEd]

Sounds like a bad temperature sensor but its only happening from 1st gear to 2nd. Might have something to do with your shift pressure too. Take it to a mechanic bro. I've been without a transmission for a month now because I let small problems get bigger!

[ryano2121]

The problem is that I removed the DPF/CAT. I can put it back but what a pain. I don't want to take it to Ford if I don't have to. I might try to change the sensor and drive easy.

[K1LLsW1TchEd]

Yea you can change the sensor and while your at it change your trans filter and inspect the fluid you remove in the process.