Conditions for Setting the DTC
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- The PCM determines that the oxygen storage capability of the TWC has degraded to less than a calibrated threshold.
- This diagnostic may conclude in only one test attempt. However this diagnostic may require as many as 108 test attempts, which would require 6 ignition cycles. Each test attempt occurs within 10 seconds.