how to fix transmission codes P0700 to P0799 on Ford F-150

Learn how to diagnose and fix transmission codes P0700-P0799 in Ford F-150. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.

2. Check Transmission Fluid

• Sub-steps:
  1. Remove the transmission dipstick and wipe it clean.
  2. Reinsert the dipstick and remove it again to check fluid level; add the appropriate type of transmission fluid if low.
  3. Inspect the fluid color and consistency; if burnt or contaminated, proceed to change fluid.
• Tools Required: Transmission dipstick, funnel, transmission fluid.

3. Repair or Replace Faulty Components

• Sub-steps:
  1. Disconnect the battery to prevent electrical shorts.
  2. Remove the TCM (if diagnosed as faulty) by unscrewing the mounting bolts and disconnecting the electrical connectors.
  3. Install the new TCM, ensuring all connections are secure and bolts are tightened to specifications (typically around 8-10 ft-lbs).
  4. If solenoids are faulty, remove the transmission pan to access the solenoids. Replace as necessary, using a new gasket when reassembling the pan.
• Tools Required: Socket set, torque wrench, screwdriver set, transmission fluid.

4. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the negative battery cable.
  2. Use the OBD-II scanner to clear any stored trouble codes.
  3. Restart the vehicle and allow it to reach operating temperature while monitoring any new codes.
• Safety Warnings: Disconnect the battery before working on electrical systems.