P0846 Code - Transmission Fluid Pressure Sensor/Switch 'B' Circuit Range/Performance

What does P0846 Mean?

The Transmission Control Module (TCM) monitors the Transmission Fluid Pressure Sensor/Switch signal. The TCM sets the OBDII code when the Transmission Fluid Pressure Sensor/Switch is not to factory specifications.

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What are the common causes of P0846 ?

• Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
• Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
• An air leak forward of the DPF will change the sensor readings resulting in the code

How do you troubleshoot P0846 ?

Any faulty, damaged or disconnected circuits and connectors should be repaired or replaced. Burned, dirty or contaminated transmission fluid will need to be replaced. If there is a shortage of transmission fluid, it should be topped up accordingly. In rare instances where the PCM itself is faulty, it will need to be replaced and the related modules reprogrammed as needed. This should be saved as a last ditch option however, as the process is costly and time-consuming.

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