AutoCodes – Generic – C1337

C1337 Code - Diameter of the Tire is not Uniform

Quick Answer

The Skid Control ECU (Brake Actuator Assembly) measures the speed of each wheel by receiving signals from the speed sensors. Common causes include Tire size or tire pressure of the front or rear tires different, Faulty Speed sensor circuit, Faulty Front speed sensor. 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: C1337 indicates Diameter of the Tire is not Uniform.
Common causes: Common causes include Tire size or tire pressure of the front or rear tires different, Faulty Speed sensor circuit, Faulty Front speed sensor.
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 1,915

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 Jan 22, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1337 Description

The Skid Control ECU (Brake Actuator Assembly) measures the speed of each wheel by receiving signals from the speed sensors. These signals are used for recognizing that all 4 wheels are operating properly. Therefore, all wheel signals must indicate the same speed. The Diagnostic Trouble Code (DTC) will be set when the average speed difference between the front wheel and rear wheel is 4% or more at a vehicle speed of 30 km/h (18.6 mph) or more.

OBDII Code C1337 - Diameter of the Tire is not Uniform - AutoCodes.com — C1337 Code - Diameter of the Tire is not Uniform

What does this mean?

What are the Possible Causes of the DTC C1337?

Tire size or tire pressure of the front or rear tires different
Faulty Speed sensor circuit
Faulty Front speed sensor
Faulty Rear speed sensor
Faulty Front speed sensor rotor (Front axle hub sub-assembly)
Faulty Rear speed sensor rotor (Rear axle hub and bearing assembly)
Faulty Skid Control ECU (Brake Actuator Assembly)
Faulty Four-Wheel Drive (4WD) ECU Assembly

How to Fix the DTC C1337?

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 C1337 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 C1337 code?

Need more information on how to fix the C1337 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1337 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1337 Lexus — Diameter of the Tire is not Uniform
C1337 Scion — Diameter of the Tire is not Uniform
C1337 Toyota — Diameter of the Tire is not Uniform

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 C1337 Code

1. What does OBDII code C1337 mean?

C1337 indicates that the vehicle's system has detected that the tire diameter is not uniform, which may affect stability and traction control functions.

2. What are the common symptoms of the C1337 code?

Symptoms can include the ABS or traction control warning light turning on, reduced vehicle stability, uneven tire wear, and inaccurate speedometer readings.

3. What causes the C1337 code to appear?

Common causes include mismatched tire sizes, uneven tire wear, improper tire inflation, or installation of non-recommended tires.

4. Can I drive with the C1337 code active?

While the vehicle may still be drivable, itâ€™s not recommended as traction control and ABS systems may be compromised, increasing the risk of accidents.

5. How can I fix the C1337 code?

Inspect the tires for mismatched sizes, uneven wear, or improper inflation. Replace or rotate tires as needed, and reset the system using an OBDII scanner.

6. Can mismatched tire brands trigger the C1337 code?

Yes, even if tires are the same size, differences in tread patterns or wear levels between brands can result in non-uniform tire diameters.

7. Will a tire rotation clear the C1337 code?

A tire rotation may help if the issue is due to uneven wear, but the code will need to be cleared with an OBDII scanner after resolving the problem.

8. Does low tire pressure cause the C1337 code?

Yes, low tire pressure can alter the effective diameter of a tire, potentially triggering this code.

9. Do I need to replace all four tires to fix the C1337 code?

It depends on the extent of the discrepancy. In some cases, replacing only the affected tires may be sufficient, but all four may need replacement for uniformity.

10. Can wheel alignment issues cause the C1337 code?

Wheel alignment itself usually doesnâ€™t cause this code, but prolonged misalignment can lead to uneven tire wear, which might trigger the issue.