Mercedes C-203 automatic transmission does not

If your 2009 Mercedes-Benz MP3 model truck's gear is not working in automatic mode and only working in manual mode, there could be a few potential causes. Here are a few steps you can try to troubleshoot and solve the issue:

1. Check the transmission fluid level: Make sure that the transmission fluid level is at the correct level and is not low. Low transmission fluid level can cause gear shifting problems.
2. Check the transmission filter: The transmission filter may be clogged, preventing the gears from shifting properly. Replace the filter if necessary.
3. Check the transmission control module (TCM): The TCM is responsible for controlling the automatic gear shifting. If it's malfunctioning, it can cause gear shifting problems.
4. Check the gear selector switch: The gear selector switch may be malfunctioning and preventing the gears from shifting properly.
5. Check the solenoids: The solenoids in the transmission may be malfunctioning and preventing the gears from shifting properly.
6. Check the transmission control linkages: The transmission control linkages may be damaged or disconnected, preventing the gears from shifting properly.

If you are not comfortable with checking these things, it's best to take the vehicle to a certified Mercedes-Benz mechanic to diagnose the problem. The technician will be able to identify the problem and repair it as necessary.
It's important to note that some of these steps may require special tools and knowledge of the vehicle's transmission system, so it's best to take it to a professional mechanic to avoid causing more damage.

a 18 ton
Mercedes-Benz Actros heavy truck.

no year told, 1996 to now
nor what transmission is there.

this
16-speed hydropneumatically operated automatic gearbox.
12-speed Powershift transmission.

Can be issue with transmission or its related components.Many car models face such problems.

For complete step by step troubleshooting,few help links are provided below.Click the link below and go through its procedure to resolve the problem:----
Engine misses and truck jumps? Hard to down shift? Issue with high gear only? http://technoanswers.blogspot.in/2012/02/engine-miss-and-truck-jumps-hard-to.html

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Car sitting for year, now will not crank and go in gear? http://repairhelpcenter.blogspot.com/2012/01/car-sitting-for-yearnow-will-not-crank.html

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2004 Peugoet: Clutch not going in gears?
http://whoisbyme.blogspot.in/2012/05/peugeot-307-clutch-will-no-go-in-gears.html

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Engine stumbles and shuts off in forward gear on Toyota Land Cruiser? http://schematicsdiagram.blogspot.com/2012/01/engine-stumbles-and-shuts-off-in.html

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Transmission problem? http://schematicsdiagram.blogspot.com/2012/01/transmission-problem.html

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Car engine Overheats and transmission starts slipping?

http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html

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Manual Transmission Clutch System Failures?

http://repairhelpcenter.blogspot.com/2011/11/manual-transmission-clutch-system.html

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Automatic transmission will not go into high gear? http://howtobyme.blogspot.com/2011/11/automatic-transmission-will-not-go-into.html

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Manual transmission very hard to shift from one gear to another? http://repairhelpcenter.blogspot.com/2012/01/manual-transmission-very-hard-to-shift.html

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Dodge manual transmission will not go in reverse gear? http://technoanswers.blogspot.in/2012/02/dodge-manual-transmission-will-not-go.html

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2006 Chrysler 300c: Shifter Stuck in Park? http://technoanswers.blogspot.in/2012/06/2006-chrysler-300c-shifter-stuck-in.html
---------- 1998 Ford Expedition: Will not Shift Out of Park? http://schematicsdiagram.blogspot.in/2012/06/1998-ford-expedition-will-not-shift-out.html
---------- Car will not move when in gear?

http://repairhelpcenter.blogspot.in/2012/02/car-will-not-move-when-in-gear.html

----------- Mercedes-Benz transmission sticks in first gear? http://technoanswers.blogspot.com/2012/01/mercedes-benz-transmission-sticks-in.html
---------- Mercedes Benz not engaging in first gear? http://technoanswers.blogspot.com/2012/01/mercedes-benz-not-engaging-in-first.html
--------- Chrysler PT Cruiser only goes in First gear?

http://howtobyme.blogspot.com/2011/11/chrysler-pt-cruiser-only-goes-in-first.html

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Car is stuck in park and the shift will not move?
http://howtobyme.blogspot.com/2011/08/car-is-stuck-in-park-and-shift-will-not.html

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These details will help.Keep updated for more help.
Thanks.

For gear shift issues and gear stuck issues,the help links are provided below. Click the link below to go through troubleshooting procedure:---- ---- Car will not move when in gear?

http://repairhelpcenter.blogspot.in/2012/02/car-will-not-move-when-in-gear.html ---- transmission sticks in first gear? http://technoanswers.blogspot.com/2012/01/mercedes-benz-transmission-sticks-in.html ----- Transmission not engaging in first gear? http://technoanswers.blogspot.com/2012/01/mercedes-benz-not-engaging-in-first.html ----- Vehicle only goes in First gear?

http://howtobyme.blogspot.com/2011/11/chrysler-pt-cruiser-only-goes-in-first.html

----

Car is stuck in park and the shift will not move?

http://howtobyme.blogspot.com/2011/08/car-is-stuck-in-park-and-shift-will-not.html

---- Engine will not go out of park mode? http://technoanswers.blogspot.in/2012/02/2002-nissan-sentra-will-not-go-out-of.html ---- Car stuck in park? http://technoanswers.blogspot.in/2012/02/nissan-sentra-stuck-in-park.html ----- Car will not come out of Park?

http://howtobyme.blogspot.com/2011/11/car-will-not-come-out-of-park.html

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Automatic transmission will not go into high gear?

http://howtobyme.blogspot.com/2011/11/automatic-transmission-will-not-go-into.html
--- Car wont downshift sometimes?

http://schematicsdiagram.blogspot.com/2011/12/car-wont-downshift-sometimes.html
---- Transmission will shift into drive?

http://schematicsdiagram.blogspot.com/2011/12/buick-park-avenuetransmission-will.html
----- Auto wont shift from park? http://schematicsdiagram.blogspot.com/2011/12/ford-taurus-wont-shift-from-park.html ---- Car Transmission will not go into Park mode?

http://schematicsdiagram.blogspot.com/2011/12/car-transmission-will-no-go-into-park.html
----- Shift indicator directly goes to 2nd when key is turned ON?

http://schematicsdiagram.blogspot.com/2011/12/shift-indicator-directly-goes-to-2nd.html
---- Third gear missing and engine losing power?

http://schematicsdiagram.blogspot.com/2012/01/third-gear-missing-and-engine-losing.html
------- Vehicle has whining sound in gear?

http://technoanswers.blogspot.com/2012/01/chevrolet-silverado-has-whining-sound.html
----- Hard to shift gears on Manual transmission?

http://technoanswers.blogspot.com/2012/01/hard-to-shift-gears-on-manual.html
------ Car hard shift at slow speeds?

http://technoanswers.blogspot.com/2012/01/car-hard-shift-at-slow-speeds.html
--- Automatic transmission shift lever hard to move on cold mornings?

http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html
------ Gear shifts hard?

http://schematicsdiagram.blogspot.in/2012/02/2000-nissan-maxima-shifts-hard.html
------- Vehicle noticed sluggish delayed shifts while driving?

http://schematicsdiagram.blogspot.in/2012/03/vehicle-noticed-sluggish-delayed-shifts.html

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This will help.

Thanks.

This is the classic symptom of a vehicle with a failed torque converter lockup solenoid.
The lockup solenoid "locks up" the transmission to the drivetrain but only operates when the transmission progresses from first gear to second gear.

the 203 transfer case is operated by a metal chain/belt. the 205 is all gear driven.(lasts longer than 203) most 1/2 ton chevy trucks have the 203 if they have the automatic. some of the newer ones have the 208. hope this helps.

Change fluid, check modulator? Very old MB towing any number of things could have happened to that transmission. Could be a vacuum leak.

There is a wire harness going to the transmission , you may want to check connection at the transmission itself. Right front corner of the trany , just above a/t flud pan , restricted view because of heat shield. But what you looking for is round electrical plug(about 2in diameter) , if you see any oil or wetness on that plug , you need to change plug adapter. Part is about $10 from dealer.Part # A 203 540 02 53.Mercedes call it a pilot bushing.There are two robber o-rings on it, wich getting old and start leaking oil inside electrical connector.Sometimes it may ruin a/t control module TCM.
Hope that may help.

If adding transmission fluid doesn't help, you need a new transmission.

Specifications Notes Use only Mercedes-Benz approved fluids

TYPE AF(DEXRON-II (R) Automatic Transmission Fluid) CAPACITY, Initial Refill*: 1982-85 190E 5.5 Liters 5.8 Quarts 1982-92 All w/V8 engines 7.7 Liters 8.1 Quarts 1986-91 190E, 260E, 300E 2.6L 6.0 Liters 6.3 Quarts 1986-91 300 Series 2.6L, except SL 6.2 Liters 6.6 Quarts 1990-91 300SL 6.0 Liters 6.3 Quarts 1992 600SEL 7.7 Liters 8.1 Quarts * Add specified quantity. With engine at operating temperature, shift transmission through all gears. Check fluid level in PARK, and add fluid as needed
diesel TYPE AF(DEXRON-II (R) Automatic Transmission Fluid) CAPACITY, Initial Refill*: 1984-89 190D Diesel 5.5 Liters 5.8 Quarts 1984-85 300 Series w/turbo 6.2 Liters 6.6 Quarts 1986-87 300 Series Diesel 6.2 Liters 6.5 Quarts 1990-93 300D Diesel 5.5 Liters 5.8 Quarts 1990-91 350SD, 350SDL Diesel 6.2 Liters 6.6 Quarts 1992-93 300SD Diesel 6.2 Liters 6.6 Quarts * With engine at operating temperature, shift transmission through all gears. Check fluid level in PARK, and add fluid as needed