GMC Error Code P0606: How to Fix It

Q: Can I drive my GMC with error code P0606?

No, you should not drive with P0606 as it indicates PCM processor failure which can cause unpredictable engine behavior, stalling, and safety issues. Have it diagnosed immediately.

Q: How much does it cost to fix GMC error code P0606?

If PCM replacement is needed, costs typically range from $800-2000 including parts and programming. Sometimes a simple reset or electrical repair can fix it for under $200.

Q: What causes GMC P0606 error code?

Common causes include PCM internal processor failure, electrical issues like low voltage or poor connections, water damage to the PCM, or corrupted software/firmware in the control module.

Q: Will disconnecting the battery fix P0606?

Sometimes a battery disconnect and PCM reset can temporarily clear P0606 if it's caused by a software glitch, but if the underlying processor fault persists, the code will return.

Q: Is P0606 covered under GMC warranty?

P0606 may be covered under your GMC powertrain warranty if the vehicle is still within the warranty period. Check with your dealer as PCM failures sometimes have extended coverage or recalls.

Abstract

GMC error code P0606 indicates a serious PCM (Powertrain Control Module) processor fault where the main computer that controls your engine and transmission has malfunctioned. This critical error can cause engine stalling, transmission problems, and prevent your vehicle from starting properly.