P0401 Diagnostic Trouble Code Discussion for March 2026
Insufficient EGR Flow Detected
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| Help Request | Posted | |
| 2003 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD54YX3 P0401: Insufficient EGR Flow Detected. ... no changes occur. I test egr system and engine run rough or died when activate egr valve. Test drive vehicle and same code p0401 occur. Next code p0741 ( torque converter ) , would a slip transmisson cause code p0741... |
March 25, 2026 |
