Check Engine Code
P0601
Internal Control Module Memory Check Sum Error
What P0601 means
The ECM ran a self-check and detected that its memory does not match the expected checksum. Sometimes self-clears after a battery disconnect; persistent P0601 typically means ECM replacement.
Symptoms
- CEL
- Random misfires
- Hard starting
- Stalling
Likely causes (most common first)
- Battery voltage spike during a recent jump-start
- Water damage to the ECM
- Failed ECM
- Recent reflash that didn't complete
Can I keep driving?
High — risk of damage if ignored
Typical repair cost
DIY fixes can start near $150 (parts only). Shop repairs for P0601 typically run up to $1500 depending on the underlying cause and vehicle. Start with the most common cause — Battery voltage spike during a recent jump-start — before throwing parts at it.
Recommended parts & tools for P0601
Our buyer’s guides cover the tools and parts that pair with AXLY:
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