Possible reasons for the confusion:
* Manufacturer-specific code: Some car manufacturers use their own, non-standard codes. It's possible that P1788 is a code specific to your particular vehicle make and model.
* Misdiagnosis: You might have been given the wrong code.
* Typo: The code might have been written incorrectly.
What to do next:
1. Check your car's owner's manual: The manual might list specific codes for your vehicle.
2. Look for your car's manufacturer's website: They might have online resources or forums that explain codes specific to their models.
3. Visit a mechanic: A qualified mechanic can use a code reader to accurately diagnose the issue and provide a solution.
Remember: Don't try to fix the issue yourself unless you are a qualified mechanic. Improper troubleshooting can damage your vehicle.