Is the ABS light on? Those seem to be transmission trouble codes--fluid too hot maybe? I never had those codes but it doesn't sound good. Does the tach wind out when the power drops? If it does your transmission may be slipping. I wouldn't wait too long to get that corrected.
Hey so I figured it out, I changed out the nsbu switch and a new transmission filter and fluid and she’s running back to normal going up hills with no problems
I'm having the same issue with my Hino 338, loosing power uphill, I replace the transmission about two weeks ago, with a remanufactured transmission also it has a new rad.
Last edited:
Hi Alex2. Are there any warning lights on? Have you had the truck checked for codes? There are countless reasons for low power.
To access engine, DCU, BCU, VCS codes, an appropriate scan tool must be connected to the 16 pin connector. Not all scan tools work on Hino engines. To access codes in the transmission and ABS, connect to the 9 pin connector. More generic code readers will work on these systems.
To access engine, DCU, BCU, VCS codes, an appropriate scan tool must be connected to the 16 pin connector. Not all scan tools work on Hino engines. To access codes in the transmission and ABS, connect to the 9 pin connector. More generic code readers will work on these systems.
yes, transmission was overheating took truck to a Hino dealer for a diagnostic paid 1k to get this done. At that time ABS light was on. they told me to replace the rad, I did replace the rad, find out that the Abs sensor was dirty, clean it it light went away. transmission its not longer overheating but now it loses power uphill. and the rpm gets stuck at 15000 rpm and it suddenly jumps back and forth to 2000 rpm but only going uphill.
There is a definite link between the ABS light and transmission failure. When the ABS light is on , the torque converter unlocks. An unintended consequence was the fluid got much hotter and it overwhelms the trans cooler.
I've looked at the circuit on a wiring diagram and found the one wire to cut to prevent the TCM from seeing ABS light input. So now if the ABS light comes on, it's not going to risk damaging the transmission
Hino fixed this in 2017, I think. Possibly 2015.
Have you had it re-scanned since this new problem developed? When they replaced the trans, they're supposed to reset the shift adaptions in the TCM. Do you know if this was done? The TCM has learned the characteristics of the old transmission, so if you stick a new trans in and don't reset it, that can cause issues.
They likely wanted to replace the radiator because when a trans grenades the shrapnel ends up in the trans cooler. You can destroy a new transmission when debris makes it through the cooler.
I've looked at the circuit on a wiring diagram and found the one wire to cut to prevent the TCM from seeing ABS light input. So now if the ABS light comes on, it's not going to risk damaging the transmission
Hino fixed this in 2017, I think. Possibly 2015.
Have you had it re-scanned since this new problem developed? When they replaced the trans, they're supposed to reset the shift adaptions in the TCM. Do you know if this was done? The TCM has learned the characteristics of the old transmission, so if you stick a new trans in and don't reset it, that can cause issues.
They likely wanted to replace the radiator because when a trans grenades the shrapnel ends up in the trans cooler. You can destroy a new transmission when debris makes it through the cooler.
It's a radiator failure, but if coolant has made it into the transmission fluid that's a big issue.
truck is parked, I'm going to have to replaced the transmission fluid. Is this normal radiator is only 1 month old
It's not a normal failure at all. I don't think I've ever seen this failure on a Hino