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1999 Mercedes-Benz C280

Question: error codes P0715 & P0700 came on today~PLEASE HELP

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Dneka90020, Los Angeles, CA, November 22, 2009, 18:10
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 Enthusiast

please help my car bugged out on me today (1999 mercedes benz c280) and these are the codes that came up when i took it to the shop P0700 ( Transmission control systm) & P0715 (TUrbine/ Input Shaft Speed Sensor Circuit) i really need to know what to fix, how to fix it & around how much it will cost me, the car still drives but i cant go over 20 mph, the car will speed up but not really shift gear~any experts can tell me what to do? The funny thing is i take really great care of my car i just had the oxygen sensors replaced not even 90 days ago to pass smog, so i know its not that again but before i had the sensors replaced i had the same problem it didnt shift gear but those codes didnt come up when they did the diagnostic whn they fixed the oxygen sensors then? If i want i can drive the car but i can press on the gas very much, it starts up perfectly fine please help.

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  • Answer #1

    backyard tech November 22, 2009, 20:16
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     Master

    Vehicle Application: 1999 Mercedes-Benz C280 2.8L

    Customer Concern: Transmission will not shift, stuck in low gear. DTC P0715 - speed sensor signal.
    Tests/Procedures: 1. Check the fluid level using Mercedes-Benz shop tool dipstick #140 589 15 21 00. The cap lock on the dipstick tube will be destroyed when removed and must be replaced after the fluid level is corrected. Check for fluid leakage on the transmission around the electrical connector at the right front of transmission and at the shift interlock cable at the rear.

    2. Use a Mercedes-Benz compatible scanner to read and clear DTC's in the Electronic Transmission Control (ETC) module and also in the Antilock Brake System (ABS)/traction systems. Also clear codes in the Powertrain Control Module (PCM). Monitor speed signals of N2 and N3 speed sensors in the ETC data stream while driving the vehicle at moderate to slow speed. If the signal drops out, or if codes reset, the speed signal is being lost from the transmission speed sensors.
    Potential Causes: Internal Transmission — Internal damage in the transmission resulting in a loss of signal from the speed sensors.
    Transmission Speed Sensor

    Tech Tips: A fully functional Mercedes-Benz compatible scan tool is required to read data stream on the ETC control module to monitor N2 and N3 speed sensors while driving.
    Diagnostic Codes: P0715

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    backyard tech, November 22, 2009, 20:19
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     Master

    Customer Concern: Transmission in limp mode, DTC P0700 - rpm sensor 3. DTC in transmission control module 147 - gear implausible or transmission slips. Transmission was rebuilt somewhere else.
    Tests/Procedures: 1. Check fluid level in transmission using M-B dipstick 140 589 15 31 00. Use only M-B fluid to spec. 001 989 21 03 10. Check all fuses. Inspect connector on the front of transmission to ensure that it is not leaking and is securely plugged in to the transmission.

    2. Using a fully functional M-B compatible scan tool, view the data stream in transmission control module for both speed sensors N2 and N3 with key on, they should both read 0. Any other reading could indicate a faulty conductor plate (which contains the speed sensors) or a faulty transmission control module or wiring problem.
    Potential Causes: Automatic Transmission (A/T) Control Unit
    Automatic Transmission Connector
    Automatic Transmission Mechanical Problem
    Automatic Transmission Wire Harness
    Conductor Plate

    Diagnostic Codes: 147, P0700

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  • Medium-star Best Answer
    Visitor, April 11, 2010, 22:23

    it is a straight forward job , remove the connector on the passenger side by twisting it then the female side have an 8 mm bolt in the middle hold in it, loosen the bolt and pull the outer connector straight (no twisting at this time) .empty the oil in a bucket that can hold up to 7 quarts so you can measure the oil so you add the same amount later,.after remove the oil pan,and the remove 10 star blots holding the valve body.when it is out remove the electronic part on the top and replace it with a new one . remember to align the shifter when installing. no panic easy job reset your ECU codes

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