Error code

OBD2 P0746

OBD2P0746
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Pressure Control Solenoid 'A' Performance or Stuck Off.

Severity

highCan drive but may experience harsh shifting and other issues. Should be addressed promptly.

Summary

P0746 indicates an issue with the Transmission Fluid Pressure (TFP) solenoid, which is stuck in the 'off' position or not performing correctly. This affects the transmission's ability to control fluid pressure for proper gear shifting and torque converter operation.

Symptoms

  • Illuminated warning light
  • Harsh, erratic, or unpredictable gear shifts
  • Transmission may slip or hesitate before selecting a gear
  • Engine stalls when slowing down due to fully engaged torque converter lock-up clutch
  • Vehicle enters failsafe mode
  • Mechanical noises from the transmission

Common Causes

  • Damaged, burnt, shorted, disconnected, or corroded wiring and connectors
  • Defective pressure control solenoid
  • Internal mechanical failures causing hydraulic circuit blockages
  • Failed pressure pump
  • Dirty, contaminated, or degraded transmission fluid
  • Low transmission fluid levels
  • Use of incorrect types or grades of transmission fluid

Diagnosis

  1. Record all fault codes and freeze frame data.
  2. Check for additional related codes and resolve them first.
  3. Inspect transmission fluid level, condition, and presence of wear particles.
  4. Identify and repair any fluid leaks before proceeding with further diagnostics.

Fixes

  • Replace the defective pressure control solenoid or faulty wiring/connectors

FAQ

What should I do if my transmission fluid is dirty?

If your transmission fluid is dirty, contaminated, or degraded, it needs to be replaced with the correct type and grade of fluid as per the vehicle's manual.

Can I drive with P0746 code?

You can drive but may experience harsh shifting and other issues. It is recommended to address this issue promptly to avoid further damage.

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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