Diagnose transmission slipping Audi Q5

Step 1: Check for Trouble Codes

Tools Required:

• OBD-II Scanner

Instructions:

1. Connect the OBD-II scanner to the vehicle’s diagnostic port, usually located beneath the dashboard.
2. Turn on the ignition without starting the engine.
3. Use the scanner to check for any stored trouble codes related to the transmission.
4. Record and clear the codes. If codes reappear after a test drive, they may indicate a persistent issue.

Step 2: Inspect Transmission Fluid

Tools Required:

• Clean rags
• Transmission dipstick (if applicable)

Instructions:

1. Park the vehicle on a level surface and ensure the engine is warm.
2. Shift the transmission through all gears and then place it in 'Park.'
3. Check the transmission fluid level using the dipstick (refer to the owner’s manual for location and procedure as some modern vehicles have sealed systems).
4. Observe the fluid color and smell:
   • Healthy Fluid: Pinkish/red and free of debris.
   • Bad Fluid: Brown/black, burnt smell, or metallic particles.
5. If fluid is low, top it off with manufacturer-recommended fluid and check for leaks.

Step 3: Perform a Visual Inspection

Tools Required:

• Flashlight
• Creeper (for under-vehicle inspection)

Instructions:

1. Inspect the transmission housing and surrounding areas for signs of fluid leakage.
2. Check the transmission pan and gasket for any signs of damage or leaks.
3. Inspect the drive shafts and CV joints for any obvious signs of wear or damage.

Step 4: Test Drive and Observe

Instructions:

1. Conduct a test drive to replicate the slipping condition.
2. Pay attention to any specific conditions that lead to slipping, such as particular gears or speeds.
3. Note any new symptoms or changes in vehicle behavior.

Repair Instructions

Step 1: Change Transmission Fluid and Filter

Tools Required:

• Socket set
• Drain pan
• Funnel
• New transmission filter and gasket kit
• Manufacturer-specified transmission fluid

Instructions:

1. Lift the vehicle using a jack and secure it with jack stands.
2. Place a drain pan under the transmission pan.
3. Remove the transmission pan bolts and carefully lower the pan.
4. Remove the old transmission filter and replace it with a new one.
5. Clean the transmission pan and install a new gasket.
6. Reinstall the pan and tighten bolts to the manufacturer’s torque specifications.
7. Refill the transmission with the recommended fluid type and quantity.

Step 2: Reprogram or Update Transmission Software

Tools Required:

• Diagnostic scan tool with programming capability

Instructions:

1. Connect the scan tool to the OBD-II port.
2. Access the transmission control module (TCM) and check for any available software updates.
3. Follow the tool’s instructions to update the TCM software if necessary.

Step 3: Professional Inspection

If the problem persists after changing the fluid and ensuring the software is updated, further inspection by a trained technician may be necessary. This could involve:

• Checking the transmission solenoids and valves.
• Inspecting the clutch packs and bands inside the transmission.
• Evaluating the need for a full transmission rebuild or replacement.

Conclusion

Transmission slipping can be a complex issue requiring detailed diagnostics and potentially extensive repairs. Addressing the problem promptly can prevent further damage and ensure the vehicle operates safely. If you're uncertain about any of these steps, consulting a professional technician is advised.