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P0601

Internal Control Module Memory Check Sum Error

The ECM's internal memory has failed a checksum self-test, indicating corrupted programming.

SeverityCritical
CategoryElectrical
Est. Repair Cost$300-$1200
Code TypePowertrain
DIY RepairProfessional

⚡ Common Causes

⚠️ Symptoms

✅ How to Fix — Step by Step

  • Step 1:Attempt ECM reflash/reprogram
  • Step 2:Clear codes and retest
  • Step 3:Replace ECM if reflash fails
💡 Pro Tip: This code often follows an interrupted ECM update - a professional reflash resolves it in many cases without needing a new module.

Repair Cost Estimate

Full Repair Estimate
$300-$1200
DIY Possible?
PRO
Severity
Critical

Frequently Asked Questions

What does OBD2 code P0601 mean?+
P0601 stands for Internal Control Module Memory Check Sum Error. The ECM's internal memory has failed a checksum self-test, indicating corrupted programming.
What causes code P0601?+
Corrupted ECM software; Failed ECM hardware; Interrupted software flash/update; Voltage spike during programming
How do I fix code P0601?+
Attempt ECM reflash/reprogram; Clear codes and retest; Replace ECM if reflash fails
How much does it cost to fix P0601?+
Estimated repair cost for P0601 is $300-$1200.
Is P0601 DIY-friendly?+
P0601 typically requires professional equipment and a qualified mechanic.

AI Diagnosis

Related Codes

P0606PCM Processor Fault
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P0602Control Module Programming Error
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P0603Internal Control Module Keep Alive Memory Error
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P0604Internal Control Module Random Access Memory Error
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P0605Internal Control Module Read Only Memory Error
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P0607Control Module Performance
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