Error code

OBD2 P0846

OBD2P0846
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Transmission Fluid Pressure Sensor/Switch 'B' Circuit Range/Performance.

Severity

moderateThe vehicle can be driven, but performance issues such as harsh shifting and slippage may occur.

Summary

P0846 indicates that there is an issue with the transmission fluid pressure sensor B circuit's range or performance in your vehicle's transmission system.

Symptoms

  • Illuminated check engine light
  • Harsh shifting
  • Slippage
  • Vehicle stuck in 'limp mode'

Common Causes

  • Failed transmission fluid pressure sensor B
  • Faulty wiring or poor connection in the TFP circuit
  • PCM (Powertrain Control Module) faulty or requires reprogramming
  • Internal transmission problem

Diagnosis

  1. Check the transmission fluid level and condition.
  2. Inspect the TFP sensor B for any visible damage or poor connections.
  3. Test the reference voltage to the sensor using a multimeter.
  4. Verify continuity between the sensor and ground.
  5. Check the return signal portion of the circuit.

Fixes

  • Replace the faulty transmission fluid pressure sensor B if it is found to be defective.

FAQ

What should I do if my vehicle enters 'limp mode'?

If your vehicle enters limp mode, you should address the underlying issue causing P0846 as soon as possible to restore normal driving conditions.

Can I drive with this code present?

You can continue to drive but may experience harsh shifting and slippage. It is recommended to have it checked by a mechanic at your earliest convenience.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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