AutoCodes – Generic – C0078

C0078 Code - Tire Diameter

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the Tire Diameter. Common causes include Tire pressure too low or too high, Wrong tire diameter. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: C0078 indicates Tire Diameter.
Common causes: Common causes include Tire pressure too low or too high, Wrong tire diameter.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 14,946

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0078 Description

The Anti-Lock Brake System (ABS) Module monitors the Tire Diameter. The ABS Module sets the OBDII code when the Tire Diameter is not to factory specifications.

OBDII Code C0078 - Tire Diameter - AutoCodes.com — C0078 Code - Tire Diameter

What does this mean?

What are the Possible Causes of the DTC C0078?

Tire pressure too low or too high
Wrong tire diameter

How to Fix the DTC C0078?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C0078 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the C0078 code?

Need more information on how to fix the C0078 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0078 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C0078 Chrysler — Tire Diameter
C0078 Dodge — Tire Diameter
C0078 Jeep — Tire Diameter

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C0078 Code

1. What does OBDII code C0078 indicate?

The OBDII code C0078 refers to an issue with the tire diameter, often related to the tire size or wheel speed sensor discrepancies.

2. What are the common symptoms of OBDII code C0078?

Common symptoms of OBDII code C0078 include traction control or ABS warning lights illuminated on the dashboard, inaccurate speedometer readings, and potential issues with vehicle stability control systems.

3. What are the possible causes of OBDII code C0078?

Possible causes of OBDII code C0078 include incorrect tire size installation, damaged wheel speed sensors, faulty wiring connections, or issues with the vehicle's control modules.

4. How can I diagnose the OBDII code C0078?

Diagnosing OBDII code C0078 typically involves checking the tire sizes to ensure they match the manufacturer's specifications, inspecting the wheel speed sensors for damage or debris, and using a diagnostic scan tool to read and clear the code.

5. Can I still drive my vehicle with OBDII code C0078?

While it may be possible to drive your vehicle with OBDII code C0078, it is recommended to address the underlying issue promptly to prevent potential safety risks and further damage to the vehicle's systems.

6. How can I repair OBDII code C0078?

Repairing OBDII code C0078 may involve correcting the tire diameter discrepancies, replacing damaged wheel speed sensors, repairing faulty wiring connections, or reprogramming the vehicle's control modules as needed.

7. Will resetting the OBDII code C0078 make it go away permanently?

Resetting the OBDII code C0078 may temporarily clear the warning lights, but if the underlying issue is not addressed, the code is likely to reappear once the vehicle's systems detect the problem again.

8. Are there any DIY fixes for OBDII code C0078?

DIY fixes for OBDII code C0078 may include checking and adjusting the tire sizes, inspecting and cleaning the wheel speed sensors, and ensuring proper wiring connections are secure. However, complex repairs may require professional assistance.

9. How much does it typically cost to repair OBDII code C0078?

The cost to repair OBDII code C0078 can vary depending on the specific cause of the issue, the extent of repairs needed, and whether any parts require replacement. Costs may range from a simple adjustment to a more involved sensor replacement.

10. Can OBDII code C0078 affect my vehicle's fuel efficiency?

While OBDII code C0078 itself may not directly impact fuel efficiency, unresolved issues related to tire diameter discrepancies can affect the vehicle's overall performance, potentially leading to decreased fuel efficiency over time.