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Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 36081
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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My 2007 Ford Crown Victoria Police is showing an Engine Code

Customer Question

My 2007 Ford Crown Victoria Police is showing an Engine Code P0645, I replaced the relay in the battery fuse box. What wires should be checked for short circuits? The a/c pump worked fine all summer.
Submitted: 1 year ago.
Category: Ford
Expert:  Ron replied 1 year ago.

Hello and thank you for your question,

Code P0645 suggests that the PCM has detected that it cannot electrically control the A/C clutch relay through the Orange/Light Blue (OG/LB) wire that runs between the relay and PCM pin 25 of the C175b connector. I have enclosed the test steps in the link below which will help you determine the cause. Copy and paste the link to your browser to open and view them. Have a look and post back if you have more questions and or need more help.