P074B OBD II Trouble Code Unable to engage Gear 3

How to quickly diagnose, repair, and info on symptoms and causes of a P074B trouble code that indicates the transmission is unable to engage gear 3.

Symptoms of P074B OBD II Trouble Code

  • Abnormal vehicle speeds
  • Low power
  • Transmission fails to go into a gear
  • Abnormal engine noises
  • Reduced throttle response
  • Limited vehicle speeds
  • ATF (Automatic Transmission Fluid) leak (red fluid under vehicle)

Common Causes of P074B OBD II Trouble Code

  • Blockage in transmission hydraulics
  • Low ATF level
  • Dirty ATF
  • Incorrect ATF
  • Shift solenoid issue
  • TCM issue
  • Wiring issue (i.e. chafing, melting, short, open, etc.)
  • Connector issue (i.e. melting, broken tabs, corroded pins, etc.)

Severity of P074B OBD II Trouble Code

Moderately-high I would say. These types of codes need to be attended to immediately. Sure, the vehicle may even drive down the street, but you will need to repair this before any further damage occurs. You could literally cost yourself multiple thousands of dollars by neglecting this too long or ignoring the symptoms. Automatic transmissions are extremely intricate designs and need to be maintained properly to keep up a smooth operation.