2002 Chevrolet Tahoe OBD2 Codes P0420, P0200, P0740, P0785, P1860 - Troubleshooting Guide
After connecting my OBD2 scanner to my 2002 Chevrolet Tahoe, I received several diagnostic trouble codes: P0420 (Catalyst System Efficiency Below Threshold), P0200 (Fuel Injection System Malfunction), P0740 (Transmission Fluid Pressure Control Circuit Fault), P0785 (Transmission Range Sensor Circuit Malfunction), and P1860 (Transmission Control Module Issue). These codes are impacting vehicle performance and I'm seeking help to understand their causes and potential fixes. The check engine light has been on for some time, and I've noticed occasional hesitation during acceleration and gear shifting issues.
Yes, the check engine light has been on for several weeks. I'm experiencing noticeable driveability problems including rough acceleration and delayed gear shifts. Any advice on how to diagnose these specific codes in a 2002 Chevrolet Tahoe would be greatly appreciated.