The P0208 code on your 2023 Chevrolet Tahoe indicates the ECM has detected a malfunction in the cylinder 8 fuel injector circuit. As a V8-powered SUV, the Tahoe has eight cylinders, and this code specifically identifies an issue with the eighth.
Cylinder 8 Location on the Tahoe
GM places even-numbered cylinders (2, 4, 6, 8) on the passenger side bank of the V8. Cylinder 8 is the rearmost cylinder on the passenger side—the one closest to the firewall. The injector connector may be challenging to access due to firewall proximity and surrounding components.
2023 Tahoe Engine Options
The 2023 Tahoe offers the 5.3L V8, 6.2L V8, and 3.0L Duramax diesel (which wouldn't set this code). Both gas V8s use direct injection and Dynamic Fuel Management that can deactivate cylinders. The direct injection system operates at high pressures and has sophisticated driver circuits.
Diagnostic Process
Access cylinder 8 by working from underneath or through the wheel well area if needed. Inspect the injector connector for damage or corrosion. Measure injector resistance and compare to specifications. Use GM's GDS2 software to command the injector individually and verify operation. Check if cylinder deactivation issues might be contributing to the code.
Repair Requirements
Direct injector replacement requires depressurizing the high-pressure fuel system. Remove the fuel rail for injector access. GM recommends replacing injector seals whenever the rail is removed. If the issue is electrical, trace and repair wiring—pay attention to any chafing against the firewall or exhaust heat shields.