P0605High urgency
Internal Control Module Read Only Memory (ROM) Error
Network · ECM/PCM
⛔ Vehicle may not start or run reliably. ECU reprogramming or replacement is required. Do not continue driving.
What this means
The ECU's read-only memory (where the base programming is stored) has detected a checksum error or data corruption. This is a serious internal ECU fault.
Likely causes
- Internal ECU memory failureMost common
- Voltage spike that corrupted ECU memoryCommon
- Attempted ECU tune/flash that went wrongCommon
Estimated repair cost
ECU reprogramming$100 – $400
Rebuilt ECU with programming$300 – $1,200
New OEM ECU with programming$800 – $2,500
🏪
Sponsored · Local Shop
Find shops near you specializing in this repair
Get quotes from certified mechanics · Free estimates
📦
Sponsored · Parts (Amazon affiliate)
Shop parts commonly used for this repair
Amazon search results for this code · prices and availability vary
Sponsored: MyOBDCode may earn compensation when you click partner links on this page.
Frequently asked questions about P0605
What does P0605 mean?
The ECU's read-only memory (where the base programming is stored) has detected a checksum error or data corruption. This is a serious internal ECU fault.
Is P0605 serious?
Vehicle may not start or run reliably. ECU reprogramming or replacement is required. Do not continue driving.
How much does it cost to fix P0605?
Repair costs for P0605 range from $100 – $400 depending on the root cause and your vehicle.
Can I drive with P0605?
No — this code indicates a serious issue. Stop driving and have the vehicle inspected immediately.