Visual/Physical Inspection
WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect for aftermarket devices, which could affect the operation of the vehicle.
- Inspect the easily accessible or visible system components for obvious damage or conditions, which could cause the symptom.
- Check for the correct lubricant level and the proper viscosity.
- Verify the exact operating conditions under which the concern exists. Note factors such as vehicle speed, road conditions, ambient temperature, and other specifics.
- Compare the driving characteristics or sounds, if applicable, to a known good vehicle and make sure you are not trying to correct a normal condition.
- Inspect for all-wheel drive activation and operation. See
- Factors that may contribute to an inoperative rear differential include:
- Low gear oil levels.
- Differential inoperative due to Anti-Lock Brake System (ABS) function.
- Inoperative Powertrain Control Module (PCM) and/or wiring system.
- A mini spare or different size tire installed.
- A fluid over-temperature condition.
- An inoperative or "stuck" clutch pump check valve.
- A defective rear differential assembly.
- An inoperative transfer case assembly.