I have a 2003 mercedes s500 and when the abs light come on my transmission doesn't want to shift gears what causes this please help

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.

This code is for a Transmission range sensor. Which can cause a vehicle to shift properly or go into gear correctly. Here are the problems that could cause that to malfunction.

• Defective Transmission Range Sensor (PRNDL input)
• Defective Transmission Range Sensor (PRNDL input) wiring or connector
• Defective Valve Body
• Defective manual shift valve linkage
• Dirty transmission fluid that restricts the hydraulic passages

sound like problem in the BRAKE TRANSMISSION SHIFT INTERLOCK SYSTEM.check brake lights make sure they work if not the brake transmission shift interlock system wont work.when you press brake pedal transmission will not come out of park. also check make sure brake light fuse has not blowed due to faulty brake light switch.

The shifter needs to be inspected. The shifter assembly is got misaligned, it has to be open and realign.

There are many other possibilities. But if it was working right up till now and suddenly this occurred then its shifter assembly alignment issue.

For car not changing gears it can be shifter assembly issue, or it can also be transmission issue. Get the shifter assembly inspected with ignition OFF.

For more troubleshooting, I suggest you to get the Following help link checked, its complete step by step procedure to inspect gear shift issues: -----

GEAR SHIFT ISSUES

http://alltypesofpartsreplacing.blogspot.com/2012/11/gear-shift-issues.html

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These will help.
Thanks.

internal transmission problem, abs is brake issue.
is 4x4 auto shift or can you select range?

You may have a voltage problem. There are voltage regulators in the cluster circuit that regulates the gauges. They are usually on the printed circuit and that is labor intensive and involves replacing the circuit. Or it can be the sending unit in the tank. The fact that the car hard shifts and the abs lamp is coming on may indicate that there is an electrical bug in your system. check several circuits with volt meter.

It stands for "Sport" and Comfort", it changes the way the transmission shifts. Read a more detailed description below.

In C, the transmission starts from a stop in 2nd gear unless the kick down switch is activated (pedal to floor from standing start). The transmission will shift at lower RPM's. This is used for everyday driving. The S mode will cause the transmission to start in 1st gear regardless of pedal position and shift at higher rpm. This button has NO effect on suspension, Mercedes have separate suspension control switches.
If this helped please rate my help.

check fluid level!
then the transmission contol solenoid

I had the same problem with ABS light and speedometer, I was told that it is the transmission control module. It has not yet stopped shifting but I have had times where it just wont stay running. It will start and then stall. Hope this helps.

Hello, The proper name for this A/T control module. Be careful because there are many other factors that control the transmission shifting like shift solenoid, throttle valve solenoid, trans speed sensor, trans temp switch etc. etc.
I hope this helps.
CYA, Gator241