{: ) The "Service Park Assist" message cannot be erased or reset until the main cause of the problem is resolved. It will just keep on coming back. Let's say one or more of the park assist sensors are faulty, you should have it repaired or replaced first before the scan tool can successfully clear the trouble codes that were present then.
The SERVICE PARK ASSIST message is a reminder that a fault has been detected by the parking assist system and it will disable this system until the problem is being addressed. A scan tool can effectively trace the cause of the fault.
SOURCE: I have a message on my 07 tahoe that says service
Vehicle sounds like it has rear back-up sensors, one or all may have failed. Will have to scan for the codes, a dealer scanner may be the only way to read those codes.
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