DTC Troubleshooting: C0078-4A

DTC C0078-4A  : Different Diameter Tire Detection

NOTE: 

• Before you troubleshoot, review the general troubleshooting information .
• The DTC will be indicated when the vehicle has a different diameter tire(s) compared to the other tires.
• Check the vehicle for different tire and wheel sizes other than what is listed on the tire and loading information label on the vehicle.
• Make sure that all four tires are ones of the same brand and model.

DTC (VSA)

1. 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, specified tire pressure, same speed rating, same brand/model, and are evenly worn?

   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 .