Transmission may not shift into Drive
it remains in P position , please help me on 2010 Mercedes-Benz GL550

how to test if transmission control modulE is failed
how to replace it?
how much is it?

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2 answers
Valve Body/Conductor Plate Recall on your gl550 read the TSB below

Date: April 29, 2011
Order No.: S-B-27.00/120a
Supersedes: S-B-27.00/120
Group: 27
Revision History
Revision Date Purpose
a 4/29/11 Clarification on Title and Parts order processing process
- 4/8/11 Initial issue
SUBJECT: All Models Equipped with 722.9 NAG2 (7G-Tronic) Transmission
All Warrantable Model Years
Diagnostic Verification for Valve Body/Conductor Plate Replacement
Mercedes-Benz USA, LLC will begin Diagnostic Verification for 722.9 NAG2 Transmission Valve
Body/Conductor Plate replacements starting on Monday, April 18, 2011. MBUSA has posted a Diagnostic
Verification form for transmission replacements which can be found on: NetStar Æ Service Æ STAR
TekInfo ÆDiagnostic Verification Proj. Æ NAG2 Valve Body/Conductor Plate
Under this program, replacement of the Model Year 2004 through present Model Year 722.9 (NAG2)
Transmission Valve Body/Conductor Plate will require verification that a replacement is necessary prior to
replacement in accordance with the program terms summarized below.
x The technician shall conduct an accurate assessment and complete documentation of the problem
by submitting a Diagnostioc verification request through NetStar Æ Service Æ STAR TekInfo
ÆDignostic Verification Proj. Æ NAG2 Valve Body/Conductor Plate.
x Upon completion of the form, click on the ‘submit’ button to send the form to Dealer Technical
Support(DTS). A Diagnostic Verfication case number will be displayed upon submission. Supporting
documentation (e.g. Short Test, Control Unit Log, Freeze Frame Data & pictures of damaged parts
where appropriate) must then be sent to diag-ver-valvebody@mbusa.com with the case number in
the subject line as a reference. Once the form and supporting documentation are received, the case
posss under warranty at dealer,or get a free est from aamco then shop prices