* Neutral Safety Switch (NSS): This switch prevents the engine from starting unless the transmission is in Park (P) or Neutral (N). It's a crucial safety feature. The exact location varies by year and transmission type, but it's often found near the transmission itself.
* Transmission Range Sensor (TRS): Similar to the NSS, but often more sophisticated, providing the vehicle's computer with precise information about the gear selected. This is a more common component in modern vehicles.
* Ignition Switch: While not directly a "neutral safety" component, a faulty ignition switch could prevent starting even if the transmission is in the correct position.
Therefore, you can't simply "change a safety neutral switch." You need to identify the specific failing component. Symptoms of problems in this area include:
* Inability to start the vehicle even with the key in the "on" position and the transmission in Park or Neutral.
* Intermittent starting problems.
* Erratic transmission behavior.
* Check Engine Light illuminated (with a related code).
To diagnose and repair the problem:
1. Obtain a diagnostic trouble code (DTC): Use an OBD-II scanner to read any codes stored in the vehicle's computer. This will often pinpoint the faulty component.
2. Consult a repair manual specific to your year and model Tahoe: This manual will provide detailed information on the location of the relevant switches, their testing procedures, and the replacement process. A Haynes or Chilton manual are good options.
3. Visually inspect the NSS or TRS: If you have identified a possible culprit from the DTC or symptoms, carefully examine it for damage or corrosion.
4. Test the component (if possible): Some switches can be tested with a multimeter to check for continuity. Refer to your repair manual for specific testing procedures.
5. Replace the faulty component: If testing confirms a faulty component, replace it with a new part from a reputable supplier. This usually requires some mechanical skills and potentially special tools.
Important Considerations:
* Safety: Working on your vehicle's electrical and starting systems can be dangerous. Disconnect the battery negative terminal before beginning any work.
* Complexity: Replacing these components often involves working under the vehicle and may require specialized tools. If you're not comfortable working on your vehicle, it's best to take it to a qualified mechanic.
* Year and Model: The location and repair process will vary significantly depending on the year and model of your Chevy Tahoe. Always consult a repair manual specific to your vehicle.
In short, don't try to fix this without proper knowledge and tools. Diagnosis is key, and a repair manual is your best friend. If unsure, a professional mechanic is the safest option.
