This code indicates a problem with the circuit related to the sensor that monitors transmission fluid pressure. The PCM (Powertrain Control Module) isn't receiving the correct signal from this sensor. This could be due to several things:
* Faulty Transmission Fluid Pressure Sensor/Switch: The sensor itself might be malfunctioning, giving incorrect readings or no reading at all.
* Wiring Problems: A break, short, or poor connection in the wiring harness leading to or from the sensor is a common culprit.
* Connectors: Corroded or damaged connectors at the sensor or along the wiring can also cause this code.
* Low Transmission Fluid: While less likely to directly trigger *this* specific code, very low transmission fluid can indirectly affect the sensor's readings and contribute to transmission problems.
Troubleshooting Steps (generally, consult a repair manual for your specific model):
1. Check Transmission Fluid Level: Ensure the transmission fluid is at the correct level and that it's clean and not burned. Low fluid can lead to related problems.
2. Inspect Wiring and Connectors: Visually check the wiring harness leading to the transmission fluid pressure sensor for any damage, breaks, or corrosion. Clean any connectors with electrical contact cleaner.
3. Test the Sensor: This usually requires a multimeter to test the sensor's resistance and voltage output. A faulty sensor will need replacement. Consult a repair manual for proper testing procedures.
4. PCM Check: In rare cases, a faulty PCM could be the cause, but this is less common. This requires professional diagnosis.
Important Note: Ignoring this code can lead to further transmission damage. It's best to address this issue promptly to avoid more expensive repairs down the line. If you're not comfortable performing these checks yourself, take your Tahoe to a qualified mechanic for diagnosis and repair.
