DTC Troubleshooting: C0078-4A
DTC C0078-4A: Different Diameter Tire Detection
NOTE:
The DTC will be indicated when the vehicle has a different diameter tire(s) compared to the other tires.
Check the record of using tires and wheels of a different size from originally supplied with the vehicle including the use of temporary spare tire.
Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

DTC Description
DTC
Freeze Frame
C0078-4A Different Diameter Tire Detection
    

1.
Tire and wheel check:

Tire and wheel check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Check all four tires for size, inflation, and wear.

Are all four tires the correct size, properly inflated, and worn evenly?

     
YES
     
     
     
The system is OK at this time. Do the TPMS calibration.?
     
NO
     
     
     
Install the correct tires, a known-good set of tires, or set the tires to the correct pressure, and do the TPMS calibration.?