Hard shifting Audi A6

Hard shifting in an Audi A6 C7 (2011-2018) can be a result of various issues ranging from transmission fluid problems to electronic control malfunctions. Below is a detailed, step-by-step guide to diagnose and fix the problem.

1. Check for Diagnostic Trouble Codes (DTCs)

• Tools Required: OBD-II Scanner
• Steps:
  • Connect an OBD-II scanner to the vehicle's diagnostic port.
  • Retrieve any stored DTCs related to the transmission.
  • Note any specific codes, especially those related to transmission solenoids, sensors, or fluid pressure.

2. Inspect Transmission Fluid

• Tools Required: Transmission fluid dipstick (if applicable), clean cloth, flashlight.
• Steps:
  • Warm up the engine to normal operating temperature.
  • Locate the transmission fluid dipstick (if applicable) and remove it.
  • Check fluid level, color, and smell. Low level, dark/burnt smell, or dirty fluid indicates a problem.
  • If the vehicle does not have a dipstick, the transmission fluid level and condition need to be checked from underneath the vehicle, which may require special tools and a lift.

3. Examine Transmission Fluid Condition

• Tools Required: Transmission fluid analysis kit (optional).
• Steps:
  • If the fluid is dark or smells burnt, it may need to be replaced.
  • Consider performing a fluid analysis to check for contamination or metal particles.

4. Inspect Transmission Mounts

• Tools Required: Flashlight, wrench set.
• Steps:
  • Inspect the transmission mounts for damage or excessive wear.
  • Replace any broken or worn mounts as they can contribute to hard shifting.

5. Evaluate Electrical Connections

• Tools Required: Multimeter.
• Steps:
  • Check all electrical connections to the transmission control module (TCM) and solenoids.
  • Ensure all connectors are secure and free of corrosion.

6. Test Transmission Solenoids

• Tools Required: Multimeter, scan tool capable of actuating solenoids.
• Steps:
  • Use the scan tool to actuate solenoids and listen for operation.
  • Test solenoid resistance with a multimeter and compare it to manufacturer specifications.

Repair Instructions

1. Transmission Fluid and Filter Change

• Tools Required: Socket set, drain pan, new transmission filter, new transmission fluid.
• Steps:
  • Jack up the vehicle and secure it on jack stands.
  • Remove the transmission pan drain plug and drain old fluid.
  • Remove the transmission pan, replace the filter, and clean the pan.
  • Reinstall the pan with a new gasket.
  • Fill the transmission with new fluid according to manufacturer specifications.

2. Replace Transmission Solenoids

• Tools Required: Socket set, new solenoids.
• Steps:
  • Remove the transmission pan and locate the solenoids.
  • Disconnect electrical connectors and remove old solenoids.
  • Install new solenoids and reconnect electrical connectors.
  • Reinstall the transmission pan and refill fluid if necessary.

3. Update or Reflash TCM Software

• Tools Required: Manufacturer-specific diagnostic tool or software.
• Steps:
  • Connect the diagnostic tool to the vehicle.
  • Check for any available software updates for the TCM.
  • Follow the procedure to reflash or update the TCM software.

4. Replace Worn Transmission Mounts

• Tools Required: Jack, jack stands, wrench set.
• Steps:
  • Support the transmission with a jack.
  • Remove bolts from the worn mount.
  • Install new mount and secure bolts to the recommended torque specification.

Final Steps

• After completing repairs, clear any stored DTCs.
• Test drive the vehicle to ensure that shifting has improved.
• Monitor for any recurrence of shifting issues or warning lights.

If the problem persists after performing the above steps, it may be necessary to consult a professional transmission specialist for further diagnosis or repair.