Do Not Shift light

[trautoranch]

She started just great then noticed "Do Not Shift" light was on, on the
shift selector. Never seen that light before. Looked in the blue book
and found no reference. Checked all the fluids and jacks, but found no
problem. Has anyone had this problem before? Would appreciate any
input. We were about to pull out for the Lone Star BB rally.

Rick & Terri McIntire
1986 PT38 8V92
Patillo,
TX
Please Help!

[krminyl@...]

Rick and Terri,

This has happened a few times with my BB too. Always while driving, and when
trying to upshift from 1st to 2nd. There is some kind of microprocessor with
the Allison trans, and my handbook says to turn the motor off, removing power
from the trans computer, and re-starting which allows it to "re-boot", for the
lack of a better term. Each time this happened to my BB, the problem corrected
itself after turning the bus off, waiting a minute or so, and restarting. If
the problem persists, I recommend it being looked at by an Allison repair
shop....they might be able to read the codes from the blinking light below the
shift buttons.

Good luck...

Kevin McKeown
Yorba Linda, CA
1986 38' PT

-----Original Message-----
From: trautoranch
To: WanderlodgeForum@yahoogroups.com
Sent: Thu, 20 Apr 2006 03:32:03 -0000
Subject: [WanderlodgeForum] Do Not Shift light


She started just great then noticed "Do Not Shift" light was on, on the
shift selector. Never seen that light before. Looked in the blue book
and found no reference. Checked all the fluids and jacks, but found no
problem. Has anyone had this problem before? Would appreciate any
input. We were about to pull out for the Lone Star BB rally.

Rick & Terri McIntire
1986 PT38 8V92
Patillo,
TX
Please Help!






Yahoo! Groups Links






[Non-text portions of this message have been removed]

[John Suter]

Rick and Terri,

The "do not shift" light on a Allison transmission
indicates one of the sensors has determined a "fault"
significant enough to potentially cause damage to the
transmission. That fault could be as innocent as "low
sump temperature" or not so innocent.

If it were to occur while the coach was in a gear,
likely the transmission would lock itself into a
single gear (the "limp home" feature) wherein you
could drive to a safe location off the main highway or
to the nearest repair facility. However, under that
condition, were you to shift to, or through, Neutral,
or shut off the ignition, the coach would not again
enter a driveable gear and it could be "tow-truck
time." (Some will add you could "re-boot" the
transmission, but that action might eliminate the
chance for repairs under warranty, and usually removes
the codes from computer memory...)

If the coach is not in gear (apparently your
situation) there will be one or more "codes" recorded
in the transmission control module memory indicating
the source of the problem(s), providing you don't
clear them, or re-boot before you "read them out."
They are "read" by the series of red and amber light
flashes, depending upon your model of Allison. As
each Allison is slightly different I'd suggest going
to the Allison site to download the "codes" or to one
of our Forum friends here, to get a copy for your
model. The Allison folks usually present seminars at
the Rally in the Vally where they distribute the
"code" information, and explain the details.

There are other diagnostic methods to include the
SilverLeaf software VMSpc which can be used should you
want to explore it in the future.

John Suter
2000LXi and prior PT40's


--- trautoranch wrote:

> She started just great then noticed "Do Not Shift"
> light was on, on the
> shift selector. Never seen that light before.
> Looked in the blue book
> and found no reference. Checked all the fluids and
> jacks, but found no
> problem. Has anyone had this problem before? Would
> appreciate any
> input. We were about to pull out for the Lone Star
> BB rally.
>
> Rick & Terri McIntire
> 1986 PT38 8V92
> Patillo,
> TX
> Please Help!
>
>
>
>


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[g_man1146]

Rick & Terri,

Same thing happened to a friends '87 PT40, shutting down and
restarting as Kevin suggested resolved their problem and it has not
done it again. I wouldn't worry if this was a one time occurance and
the shutdown reset it. JMHO.
Rich D. '99LXi43' CT


--- In WanderlodgeForum@yahoogroups.com, krminyl@... wrote:
>
> Rick and Terri,
>
> This has happened a few times with my BB too. Always while
driving, and when trying to upshift from 1st to 2nd. There is some
kind of microprocessor with the Allison trans, and my handbook says
to turn the motor off, removing power from the trans computer, and
re-starting which allows it to "re-boot", for the lack of a better
term. Each time this happened to my BB, the problem corrected
itself after turning the bus off, waiting a minute or so, and
restarting. If the problem persists, I recommend it being looked at
by an Allison repair shop....they might be able to read the codes
from the blinking light below the shift buttons.
>
> Good luck...
>
> Kevin McKeown
> Yorba Linda, CA
> 1986 38' PT
>
> -----Original Message-----
> From: trautoranch
> To: WanderlodgeForum@yahoogroups.com
> Sent: Thu, 20 Apr 2006 03:32:03 -0000
> Subject: [WanderlodgeForum] Do Not Shift light
>
>
> She started just great then noticed "Do Not Shift" light was on,
on the
> shift selector. Never seen that light before. Looked in the blue
book
> and found no reference. Checked all the fluids and jacks, but
found no
> problem. Has anyone had this problem before? Would appreciate
any
> input. We were about to pull out for the Lone Star BB rally.
>
> Rick & Terri McIntire
> 1986 PT38 8V92
> Patillo,
> TX
> Please Help!
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>

[trautoranch]

-John,
Thank you for your reply. On the trans. test button where you check
for your code, there is no lights coming on. Have checked and
cleaned all battery
connections.
Best
regards,
Rick & Terri
M


In WanderlodgeForum@yahoogroups.com, John Suter
wrote:
>
> Rick and Terri,
>
> The "do not shift" light on a Allison transmission
> indicates one of the sensors has determined a "fault"
> significant enough to potentially cause damage to the
> transmission. That fault could be as innocent as "low
> sump temperature" or not so innocent.
>
> If it were to occur while the coach was in a gear,
> likely the transmission would lock itself into a
> single gear (the "limp home" feature) wherein you
> could drive to a safe location off the main highway or
> to the nearest repair facility. However, under that
> condition, were you to shift to, or through, Neutral,
> or shut off the ignition, the coach would not again
> enter a driveable gear and it could be "tow-truck
> time." (Some will add you could "re-boot" the
> transmission, but that action might eliminate the
> chance for repairs under warranty, and usually removes
> the codes from computer memory...)
>
> If the coach is not in gear (apparently your
> situation) there will be one or more "codes" recorded
> in the transmission control module memory indicating
> the source of the problem(s), providing you don't
> clear them, or re-boot before you "read them out."
> They are "read" by the series of red and amber light
> flashes, depending upon your model of Allison. As
> each Allison is slightly different I'd suggest going
> to the Allison site to download the "codes" or to one
> of our Forum friends here, to get a copy for your
> model. The Allison folks usually present seminars at
> the Rally in the Vally where they distribute the
> "code" information, and explain the details.
>
> There are other diagnostic methods to include the
> SilverLeaf software VMSpc which can be used should you
> want to explore it in the future.
>
> John Suter
> 2000LXi and prior PT40's
>
>
> --- trautoranch wrote:
>
> > She started just great then noticed "Do Not Shift"
> > light was on, on the
> > shift selector. Never seen that light before.
> > Looked in the blue book
> > and found no reference. Checked all the fluids and
> > jacks, but found no
> > problem. Has anyone had this problem before? Would
> > appreciate any
> > input. We were about to pull out for the Lone Star
> > BB rally.
> >
> > Rick & Terri McIntire
> > 1986 PT38 8V92
> > Patillo,
> > TX
> > Please Help!
> >
> >
> >
> >
>
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam? Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
>

[trautoranch]

Kevin, Thank you
for the information . We have started and restarted with no look.
There is no lights flashing to be able to read codes.
Best Regards,
Rick & Terri
86PT38
Patillo,Tx













>
> Rick and Terri,
>
> This has happened a few times with my BB too. Always while
driving, and when trying to upshift from 1st to 2nd. There is some
kind of microprocessor with the Allison trans, and my handbook says
to turn the motor off, removing power from the trans computer, and
re-starting which allows it to "re-boot", for the lack of a better
term. Each time this happened to my BB, the problem corrected
itself after turning the bus off, waiting a minute or so, and
restarting. If the problem persists, I recommend it being looked at
by an Allison repair shop....they might be able to read the codes
from the blinking light below the shift buttons.
>
> Good luck...
>
> Kevin McKeown
> Yorba Linda, CA
> 1986 38' PT
>
> -----Original Message-----
> From: trautoranch
> To: WanderlodgeForum@yahoogroups.com
> Sent: Thu, 20 Apr 2006 03:32:03 -0000
> Subject: [WanderlodgeForum] Do Not Shift light
>
>
> She started just great then noticed "Do Not Shift" light was on,
on the
> shift selector. Never seen that light before. Looked in the blue
book
> and found no reference. Checked all the fluids and jacks, but
found no
> problem. Has anyone had this problem before? Would appreciate
any
> input. We were about to pull out for the Lone Star BB rally.
>
> Rick & Terri McIntire
> 1986 PT38 8V92
> Patillo,
> TX
> Please Help!
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>

[John Suter]

Sounds like a one-time issue that may not be
significant. If it occurs again, you can take
appropriate action.

Good Luck

John Suter


--- trautoranch wrote:

> -John,
> Thank you for your reply. On the trans. test button
> where you check
> for your code, there is no lights coming on. Have
> checked and
> cleaned all battery
> connections.
>
> Best
> regards,
>
> Rick & Terri
> M


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[Gregory OConnor]

I had the Do not Shift light come on with a buzzer but it went out
before I had a chance to exit the freeway. Last month I sent the bus to
a DD / Allison shop to have the codes read and have an expert do the
trans service , drop the pan, cut the filter, check the retarder, do a
road test. I was told; "the codes get erased when the bus is shifted
into reverse therefor , no codes" "The trans does not have a
retarder" "The oil and filters looked good" "will that be debit or
Credit" I am not convinced the $100+ per the hour tec gave me my
$500.00 worth or info and service. I want to find time and visit
another shop and see if they think the codes are stored.

Gregory O'Connor
94pt40 Romoland California