P0601 — Internal Control Module Memory Check Sum Error
High severityWhat it means
P0601 is stored when the engine control unit sees a fault involving the control module's internal memory. This code means the control module failed an internal memory (checksum) self-test, which can make its decisions unreliable. The fault points to the module's internal operation or its power, ground and network connections rather than a single external sensor.
Common symptoms
- Multiple warning lights
- Poor running or no-start
- Modules failing to respond
Likely causes
- Low voltage, poor ground or a corroded connector at the module
- Low system voltage or a poor ground corrupting memory
- Internal control-module failure
What to check first
- Verify module power, grounds and battery voltage before suspecting the module itself
- Check power, ground and battery voltage to the module first
- Verify the module software is up to date before replacing it
Can you keep driving?
An unreliable control module can affect running and safety functions; have it diagnosed promptly.
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All information, explanations and guidance on this page are general preliminary information only. They are estimates and may be entirely wrong, incomplete or inaccurate, or may not apply to your vehicle at all. Never take any action based on this content alone — do not decide to keep driving, clear codes, replace parts, repair or otherwise work on your vehicle based only on what you read here. In every case, and for any final decision, you must consult qualified technical personnel (a professional mechanic, an authorized service centre or an engineer) and obtain their approval before acting. MechanicAI accepts no liability or responsibility whatsoever for any damage, fault, injury, loss or outcome that may arise — directly or indirectly — from using or relying on this information, for any reason and under any circumstances. By using this page you acknowledge and accept these terms.