Question about 2003 Mercedes-Benz E-Class

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Got a code po705, replaced the conductor plate and plug with new ones.

The car drove and shifted fine all day then wouldn't go into park and the code came back

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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

Posted on Dec 27, 2015

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Posted on Jan 02, 2017

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Po705 on 2003 mercedes e500, I replaced the conductor plate and plug. car drove fine all day then it wouldn't shift into park and the code came back


There is no point in just changing parts and hoping the new part was the one that would fix the problem which seems to be the scenario here. The Fault Code XXXX = Bad Part YYY is not a valid repair system because there are usually numerous causes for the one fault code being generated.

You need to have a proper diagnosis done and the computer may well also be generating additional fault codes relating to the transmission electronics.

If you want it fixed you will need to take the car to a Mercedes dealer service center or a competent independent Mercedes specialist that is familiar with that model. They will run a scan on the car, pick up the fault codes and start their diagnosis from there.

Needless to say, the electronics in these cars are very complex.

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Hi, I have a Chev Metro 2000 Automatic that I am trying to pass the Calif Smog test. It passed to emission Test. It failed for (OBO Code)P0705 Trans Range Sensor Malfunction (PRNDL Input). The Service...


There is a diagnostic route on the PO705 code,which involves hooking up a scan tool,and verifying sensor functions.It can also involve checking continuity of the circuit,and PCM commands.The majority of the time,replacing the sensor in question resolves the problem,but after replacement,the sensor needs adjusting to be correctly aligned,to give the correct reading in each gear range.If replacing the sensor does not repair the problem,then it's down to checking the wires involved in the circuit for continuity.If the wires check out OK,then it's going to be checking the PCM (computer) for proper commands and outputs.Resolving the code will likely repair the problem you are having getting the vehicle out of Park.The "stuck in Park" problem has to do with the shift interlock,where you have to press the brake pedal down to disengage the shifter.It is possible you have two separate problems,but repair the PO705 code first,and see what happens with the interlock problem.The PO705 HAS to be repaired to pass inspection anyways.I guess i didnt explain,but the PRNDL switch is the sensor that tells the vehicle computer (PCM) which gear the trans is in..Park,Reverse,Neutral,Drive,Low (PRNDL).Good luck.

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