What does P0870 Mean? The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. When you see P0870 engine fault code on your engine code reader this description will help you. engine code P0870P0870 fixobd P0870dtc P0870obd code P0870obd2 P0870P0870 car codediagnostic code P0870car code P0870check engine code P0870fehlercode P0870P0870 fiatcodigo P0870codigo falla P0870P0870 kody b??dówcodigo de falla P0870 What are the common causes of P0870 ? Common causes include a low transmission fluid condition (caused by a transmission fluid leak), a defective transmission high pressure pump, a faulty or slipping transmission, a faulty transmission temperature sensor, overheating engine, or faulty PCM. When this code is set, it is imperative that the transmission be checked prior to further vehicle operation. How do you troubleshoot P0870 ? 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. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications. Searches related to P0870 - Transmission Fluid Pressure Sensor/Switch 'C' Circuit transmission fluid pressure sensor location p0870 dodge caravan p0870 jeep liberty p0870 dodge avenger p0871 p0870 jeep wrangler p0870 dodge ram p0871 transmission fluid pressure sensor switch c circuit range performance Read more: P0870 Transmission Fluid Pressure Sensor/Switch 'C' Circuit