P0849 Code - Transmission Fluid Pressure Sensor/Switch 'B' Circuit Intermittent

What does P0849 Mean?

OBD-II Code Transmission may not shift properly is defined as a Transmission Fluid Pressure Sensor/Switch "B" Circuit Intermittent

The Transmission Fluid Pressure Switch allows the engine's control module (PCM) or Transmission Control Module (TCM) to use hydraulic fluid to engage the clutches in the transmission to allow for smoother shifting while driving. If the PCM or TCM detects an issue with the hydraulic clutch or the pressure switch, the PCM or TCM will set code P0849.

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What are the common causes of P0849 ?

Common causes include a faulty electronic pressure control solenoid, transmission fluid pressure sensor, hydraulic blockages inside the internal transmission fluid passages, mechanical internal transmission failures, low transmission fluid, dirty or contaminated transmission fluid, a faulty PCM or transmission control module.



How do you troubleshoot P0849 ?

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. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

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