1999 Chevrolet Express PCM problems may trigger P0601 and drivability issues. Factory cautions on module replacement, relearn procedures, and reprogramming requirements for 7.4L models.
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1998 Chevrolet Express PCM/ECM Replacement Guide (7.4L)
If your 1998 Chevrolet Express 7.4L shows code P0601, PCM failure may be the cause. Follow factory ESD and battery cautions. Learn about 1.1-hour labor and 0.5-hour relearn.
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1997 Chevrolet Express PCM and ECM Service Guide
If your 1997 Chevrolet Express shows no‑start, stalling or shift glitches, be aware of PCM caution and learn how proper replacement restores performance.