P0601: Internal Control Module Memory Check Sum Error
Can you still drive? Drive cautiously to a repair shop. The vehicle may go into limp mode or stall unpredictably. Avoid highway driving if possible.
What Does P0601 Mean?
Code P0601 indicates that the PCM has detected an internal memory checksum error during its self-test routine. The checksum verifies that the data stored in the module's memory has not been corrupted. This code can indicate a failing PCM or can result from power interruptions during a PCM reflash or update.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Failing PCM internal memory
- Interrupted PCM programming or reflash
- Power surge or voltage spike damaging PCM
- Corroded PCM connector allowing moisture ingress
- Low battery voltage during PCM operation
Symptoms
- Check engine light on
- Multiple seemingly unrelated fault codes
- Engine running poorly or in limp mode
- Intermittent stalling
- Erratic gauge readings
Diagnostic Steps
- 1Clear the code and check if it returns immediately
- 2Check battery voltage and charging system health
- 3Inspect PCM connectors for corrosion or water damage
- 4Attempt to reflash the PCM with updated software
- 5If code persists after reflash, PCM replacement is likely needed
- 6Check for technical service bulletins related to PCM updates
Recommended Parts & Tools
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $200 - $1500 |
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Chat with AI About P0601Commonly Affected Vehicles
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Frequently Asked Questions
Does P0601 always mean I need a new PCM?
Not always. Sometimes clearing the code or reflashing the PCM resolves the issue. However, if the code returns after a reflash, the PCM likely needs replacement.
How much does a PCM replacement cost?
A new or remanufactured PCM typically costs $300-$1,000, plus $100-$500 for programming and installation. Some vehicles require dealer-only programming.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
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