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Aisin AS68RC Tech Tips
The Aisin AS68RC transmission
was introduced in 2004 with Mitsubishi trucks
called the AS6, soon followed by
Dodge trucks with the Cummins diesel engine and Sterling
bullet in 2006, as well as in Isuzu, which is called the A465. In Nissan UD
trucks the Transmission is called the
M036A6. This is six speed automatic with lock up
torque converter clutch.
AS68RC/A465 transmission rebuild
technical manual available now! For
all makes and models.
Fluid requirements for Aisin AS68RC/A465 transmission.
The required fluid for the Aisin
AS68RC transmission is Exxon JWS3309, or Mobil ATF-3309. Dodge sells as
AS68RC fluid. do not use Dexron or Mercon fluids or any other
kind of fluid in this transmission or damage will result.
Pressure testing and general information
For some Free technical information such as pressure testing
transmission, applied elements and some pinout tests you
can perform on the Aisin AS68RC transmission please follow this
to view PDF document.
Aisin AS68RC/A465 transmission Pressure switch codes:
Multiple or random pressure switch codes, may be intermittent or hard faults. these are set because TCM
doesn't see switch feedback after shift or during Gear commanded at anytime, we have seen many times a valve body gasket blown out causing these codes.
You can pull off pan and sometimes see valve body gasket pieces hanging out the
sides of VB.
Also valve body/valve issues such as debris sticking etc.
rarely is it the actual switches. can be wiring problems too, such as chaffed or
linear solenoids that have failed can cause pressure switch codes. failed
mechanically will not create solenoid codes but can create switch codes and
missing shifts etc.
If pan is clean
and you've checked circuits between transmission and TCM then likely in valve body area.
No Forward movement in D range. Will move in manual low.
Truck will not move forward unless shifted to manual low position, has reverse. the F1 sprague in the rear of the transmission has failed. This can be replaced by removing the
rear extension housing and or transfer case, and output shaft components.
Severe overheating, slipping in 4th,5th and 6th gears or possible no movement.
Common problem with this transmission can be that the stator shaft has turned in pump cover. can cause no movement, converter overheating, and or slipping in 4th, 5th and 6th gears.
A competent machine shop may be able to remove and key the stator back in place or you must purchase a new valve body and pump assemblies from the dealer. If
cover beware to use pressure regulator valve spacer set up out of old pump cover as valve body is calibrated to these shim set up/regulator valve settings.
AS68RC/A465 Harsh shifts, all the time or intermittently, reset adapts= temp fix sometimes.
There's been a lot of questions regarding this complaint, most with Dodge trucks.
we've been finding several causes for this: One can be the TCM needs to be reflashed at dealer.(update software)
second: speed sensor wiring issues or the sensors themselves. you may or may not have a code. hard to determine without code unless you Graph the signal to TCM.
If you have no codes try reflash of TCM first. third: can be internal damage,
Dodge diesel trucks only, soft shifts and or burnt clutches.(Engine programmers)
Transmission shifting very softly, all clutches may be burnt, If adapts reset no change is felt. There may be diesel engine performance enhancement program installed in the ecm.
the problem with this is some of these programs did not address the transmission and then the increased
horsepower is too much for the transmission and the shift adapts freeze due to the engine
enhancements. this will burn up the transmission repeatedly. some of the companies offer way to remove these programs from ecm. if not you will have to replace the engine ecm.
We offer Free transmission
diagnostic help for Aisin AS68RC transmissions via