What does P0858 Mean? When the PCM, or a related module, doesn't receive input from the traction control module, a P0858 trouble code is stored and the check engine light illuminates. In some models, the traction control light might also illuminate and the transmission will be placed in Limp-in mode. engine code P0858P0858 fixobd P0858dtc P0858obd code P0858obd2 P0858P0858 car codediagnostic code P0858car code P0858check engine code P0858fehlercode P0858P0858 fiatcodigo P0858codigo falla P0858P0858 kody b??dówcodigo de falla P0858 What are the common causes of P0858 ? By far the most common cause of this code is from a defective traction control ON/OFF switch. Liquids spilled into the traction control switch are a very common cause of this type of failure. Other causes may include open, shorted, corroded, or otherwise damaged wiring and/or electrical connectors. Technicians also report the presence of excessive corrosion in the sensor connector as the cause of this code being stored. How do you troubleshoot P0858 ? Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Now, clear the codes and test-drive the vehicle to see if the code is reset. Searches related to P0858 Code - Traction Control Input Signal Low P0858 P0859
