We don't have that code in our Mitchell 1 manuals. However I did find this. Hope this helps.
The diagnostic test code 1281 means that engine is cold. It means that the thermostat temperature is below normal working temperatures during vehicle travel. These codes are usually in the owner's manual that you can refer to. However, if you do not have one you can inquire for one from the dealers.
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.