What are the common causes of P0601?

Internal PCM memory failure. Failed PCM software update or corruption. Voltage spikes damaging the PCM. Low battery voltage during a write operation. Hardware fault in the control module.

Verify battery voltage and charging system health first. Check for PCM software update or TSBs from the vehicle maker. Reprogram the PCM per the vehicle's procedure. Replace the PCM if the error persists after reprogramming. Ensure proper PCM power and grounds before replacement.

P0601

Internal Control Module Memory Check Sum Error

System: Computer output circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P0601 means Internal Control Module Memory Check Sum Error.

Where it lives

For P0601, the part to look at first is the module named here.

Check these first

Internal PCM memory failure
Failed PCM software update or corruption
Voltage spikes damaging the PCM
Low battery voltage during a write operation
Hardware fault in the control module

What to do next

Verify battery voltage and charging system health first
Check for PCM software update or TSBs from the vehicle maker
Reprogram the PCM per the vehicle's procedure
Replace the PCM if the error persists after reprogramming
Ensure proper PCM power and grounds before replacement

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Updated

Generic SAE J2012 definition. Last updated 2026-08-30.