01 What Parts Can a Car Engine Run Without? • 02 U0018: Medium Speed CAN Communication Bus (-) shorted to Bu… • 03 Locked Out? Top Reasons Your Key Fob Isn’t Unlocking Your V… • 04 How to Avoid and Handle a Hydroplaning Vehicle: A Complete … • 05 Should You Warm Up Your Car Engine Before Driving? • 06 Turbocharged Engine Maintenance: Dos and Don’ts • 07 V10 vs V8 Engine: Which One is Better? • 08 Why Disconnecting Your Car Battery for Storage is a Good Ba… • 09 Experts Reveal Why Saying One Wrong Phrase At A Dealership … • 10 Gearing Up: How Cetane Numbers Boost Your Diesel Engine's P… •

DTC codes / C02xx · Brakes, steering and suspension / C0245

C0245Wheel Speed Sensor Frequency Mismatch

C0245 means the anti-lock brake system (ABS) module has detected a mismatch in the frequency signals reported by two or more wheel speed sensors. The computer compares the speed of each wheel and flags this code when one or more sensors report a frequency that does not agree with the others or with the vehicle's expected speed.

SystemChassis
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaBrakes, steering and suspension

Symptoms you may notice

  • ABS warning light illuminated on the dashboard
  • Traction control or stability control warning light also on
  • Often no symptoms besides the warning light
  • ABS may deactivate, leaving conventional braking only
  • Speedometer may read erratically or drop out
  • Cruise control may stop working or disengage unexpectedly

Common causes, most likely first

  1. Contaminated or damaged wheel speed sensor tone ring (reluctor ring)
  2. Wiring fault in the wheel speed sensor circuit, such as a chafed wire or corroded connector
  3. Failed wheel speed sensor
  4. Excessive wheel bearing play or hub runout causing an erratic signal
  5. Mismatched tire sizes or uneven tire wear between wheels
  6. ABS module internal fault or software issue
  7. Debris or metallic particles stuck to the sensor tip or tone ring

How to diagnose and fix it

  1. Inspect all tires for correct size, matching circumference, and proper inflation
  2. Use a scan tool to view live wheel speed data from each sensor and compare readings while driving
  3. Visually inspect each wheel speed sensor, tone ring, and connector for damage, corrosion, or debris
  4. Check sensor wiring for continuity, shorts to ground, and chafing near suspension components
  5. Clean or replace a contaminated or damaged tone ring or sensor as needed
  6. Check wheel bearings and hub assemblies for excessive play or runout
  7. If all external components check out, diagnose the ABS module for internal faults

What most technicians overlook with C0245

  • A common cause is mismatched tire sizes or uneven wear between the left and right sides, which changes the rolling circumference and creates a frequency difference the ABS module interprets as a sensor fault.
  • Metallic debris or rust buildup on the tone ring can distort the signal without setting a sensor-specific code, so cleaning the ring often resolves the mismatch.
  • A failing wheel bearing can cause enough hub runout to produce an erratic signal that mimics a bad sensor, so always check bearing play before replacing parts.
  • This code does not always mean a sensor has failed; wiring harness damage from road debris or suspension movement is frequently the real culprit.
  • After repairs, the ABS module may require a relearn or calibration procedure, and simply clearing the code may not be enough on some vehicles.

Can I keep driving with C0245?

The vehicle remains drivable with conventional brakes, but ABS and traction control are disabled, which increases stopping distance on slippery surfaces. Avoid hard braking or emergency maneuvers and have the fault diagnosed promptly.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage