722.9 not shifting higher than 2
06-18-2024, 06:08 PM
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W221 2007
722.9 not shifting higher than 2
Hi
2007 S550
Shifts nicely from P to R and D.
Shift from 1-2 only after several slippings and half a mile driving. No shifts past 2. In diag mode shifting manually shows target gear correctly but only to P R D 1 2. Trying to manually shift to 3 is not even showing 3 as a target gear.
Filter oil swapped and correctly filled at 45 C.
Adapted via Launch X431.
Cond plate swapped.
Valve body cleaned, very very little shavings. Didn't take out spring valves but checked tension and ball valves also.
One faulty solenoid swapped. All solenoids resistance tested. Nets pretty clean and looked ok. Magnet cleaned.
Car runs rough.
Tumble flap issue will be addressed.
Voltage too high on transmission error. Voltage regulator ordered for 910 option.
Rear battery drains. Teleaid coming out when MOST coupler arrives.
New ABS wheel sensors coming.
TCU should have latest software.
Bought it really cheap at copart after two years of massive neglect. 140k miles. Project car as I was sad to see it rot....
Drive authorization on instrument cluster active after replacement.
Any ideas?
Thank you
Richard
2007 S550
Shifts nicely from P to R and D.
Shift from 1-2 only after several slippings and half a mile driving. No shifts past 2. In diag mode shifting manually shows target gear correctly but only to P R D 1 2. Trying to manually shift to 3 is not even showing 3 as a target gear.
Filter oil swapped and correctly filled at 45 C.
Adapted via Launch X431.
Cond plate swapped.
Valve body cleaned, very very little shavings. Didn't take out spring valves but checked tension and ball valves also.
One faulty solenoid swapped. All solenoids resistance tested. Nets pretty clean and looked ok. Magnet cleaned.
Car runs rough.
Tumble flap issue will be addressed.
Voltage too high on transmission error. Voltage regulator ordered for 910 option.
Rear battery drains. Teleaid coming out when MOST coupler arrives.
New ABS wheel sensors coming.
TCU should have latest software.
Bought it really cheap at copart after two years of massive neglect. 140k miles. Project car as I was sad to see it rot....
Drive authorization on instrument cluster active after replacement.
Any ideas?
Thank you
Richard
Last edited by RKW221; 06-18-2024 at 06:17 PM.
06-18-2024, 08:50 PM
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2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
My understanding is that the solenoids and conductor plate are matched at the factory and cannot be swapped, though I have no confirmation of that. Do you have a history of the car?
06-18-2024, 08:59 PM
#3
Super Member
When my '99 did that it was limp mode because the tcu took dump. bought one on ebay for ~$200 and it was good to go. just needed to check if it was compatable, which the junkyard seller did for me
