46RE Overdrive
#1
46RE Overdrive
I can see this has been covered a lot, but my problem seems to be different to most i can find
My 96 2500 with 5.9L magnum and 46RE wont shift into overdrive, i do get the TC lockup and 200ish rpm drop at OD speed but it stays in 3rd
with the OD off switch off it stays in 3rd but when coasting revs drop to idle, and when you put your foot down again it picks backup at normal 3rd gear rpm
with the OD off switch on it stays in 3rd, no TC lockup and engine RPM as normal
have checked/cleaned OD/TCC solenoid and was about to pull OD unit off and disassemble but thought it ask first as the common problems (broken snap ring/spring) dont seem to give my symptoms?
trans operates perfectly otherwise, other than not starting in P sometimes and have to move to N to start
any help greatly appreciated. thanks
My 96 2500 with 5.9L magnum and 46RE wont shift into overdrive, i do get the TC lockup and 200ish rpm drop at OD speed but it stays in 3rd
with the OD off switch off it stays in 3rd but when coasting revs drop to idle, and when you put your foot down again it picks backup at normal 3rd gear rpm
with the OD off switch on it stays in 3rd, no TC lockup and engine RPM as normal
have checked/cleaned OD/TCC solenoid and was about to pull OD unit off and disassemble but thought it ask first as the common problems (broken snap ring/spring) dont seem to give my symptoms?
trans operates perfectly otherwise, other than not starting in P sometimes and have to move to N to start
any help greatly appreciated. thanks
#2
#3
OD off switch light seems to operate correctly, and does switch TC lockup correctly etc
thanks
#4
In that case, may want to plug in with a better scanner, and see what PCM thinks trans temp is. If it isn't setting a code, that implies it thinks there is something else going on, that it shouldn't shift into O/D...... basically, the only things it pays attention to are vehicle speed, engine load, and trans temp.... If the PCM were actually requesting O/D, and then not getting it, it would whine about that......
#5
In that case, may want to plug in with a better scanner, and see what PCM thinks trans temp is. If it isn't setting a code, that implies it thinks there is something else going on, that it shouldn't shift into O/D...... basically, the only things it pays attention to are vehicle speed, engine load, and trans temp.... If the PCM were actually requesting O/D, and then not getting it, it would whine about that......
#6
In that case, may want to plug in with a better scanner, and see what PCM thinks trans temp is. If it isn't setting a code, that implies it thinks there is something else going on, that it shouldn't shift into O/D...... basically, the only things it pays attention to are vehicle speed, engine load, and trans temp.... If the PCM were actually requesting O/D, and then not getting it, it would whine about that......
#7
I don't know if O/D request is a parameter you can read....... You can install a test light in the circuit for the O/D solenoid, to see if the PCM is actually triggering it, but, if it were, and it didn't see the RPM drop it expected, it would set a code right quick. So, I really suspect that it simply ISN'T requesting O/D...... Since the light in the switch operates as intended, I don't think the switch is the issue. Gotta be something else going on.
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#8
I don't know if O/D request is a parameter you can read....... You can install a test light in the circuit for the O/D solenoid, to see if the PCM is actually triggering it, but, if it were, and it didn't see the RPM drop it expected, it would set a code right quick. So, I really suspect that it simply ISN'T requesting O/D...... Since the light in the switch operates as intended, I don't think the switch is the issue. Gotta be something else going on.
#9
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MoparFanatic21 (02-11-2020)
#10
that should confirm i should be looking outside the trans, then will look at trans temp and output speed etc
thanks again guys