Mercedes-Benz S+class P115B Code:

OBD-II Diagnostic Powertrain (P) Trouble Code

Trouble In Mercedes-Benz S+class P115B Possible Cause

The most likely cause of Mercedes-Benz S+class P115B code being stored is a defective automatic transmission cooler control valve or valve position sensor. Other causes may include corroded, open, or shorted wiring or connectors, a loose control module ground strap, or broken ground wire.

Common Symptoms For Mercedes-Benz S+class P115B

  1. If there is no low voltage (usually 5-volts) on the signal wire, disconnect the PCM connector and perform a continuity test on the wire using the digital volt/ohmmeter
  2. This will help to determine whether or not the malfunction is intermittent. After the codes are cleared, test drive the vehicle to see if the code returns
  3. If the fluid smells or appears burned, remove the transmission pan and check for the presence of clutch material and other debris
  4. Should all system circuitry and sensors check out and the transmission is in good working order, suspect a faulty PCM but keep in mind that PCM failure is rare and PCM replacement will require reprogramming.

Similar Problems

Transmission
Low Coolant Circuit
TFP Valve Position Switch-Drive Without Drive Ratio

Mercedes-Benz S+class P115B Troubleshooting

White smoke means that the fuel that is being injected into the combustion chamber is not being burned properly. The common causes that produce white smoke range from something as simple as low engine compression or water in the fuel to the fuel pump timing being thrown off because something is starving the fuel from getting to the pump in the manner necessary for the pump to time and work correctly. Mercedes-Benz S+class P115B the main thing to check is to verify the operation of the VCT solenoid. You're looking for a sticking or stuck VCt solenoid valve caused by contamination. Refer to vehicle specific repair manual to perform component tests for the VCT unit.

How to turn off Mercedes-Benz S+class P115B check engine light ?

There are two ways to turn off the check engine light:

A repair technician can do so once repairs have been made.
The OBD II can automatically turn it off when it fails to detect the problem after several diagnostic cycles.

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