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Code

P0601

ECM

Internal control module memory checksum error

The engine computer detected an internal memory fault.

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Most likely causes

Failed ECM
Corrupted software
Low voltage during programming

Symptoms you may notice

Check engine light
Possible no-start or limp mode

Checks to run

Check battery and charging system first
Update or replace ECM

Tools you may need

OBD-II scanner

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

Related codes in ECM

ECM processor fault

ECM performance

ECM power relay control circuit malfunction

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