What Does C0245 Mean?
This code indicates that the Anti-lock Braking System (ABS) module has detected an abnormal frequency signal from one or more wheel speed sensors. The sensor is producing a signal that is outside the expected frequency range during wheel rotation, which prevents accurate wheel speed measurement. This compromises the ABS, traction control, and stability control systems' ability to function properly.
Safety Warning
Not safe to drive normally as ABS, traction control, and stability control systems will be disabled or malfunctioning, significantly increasing stopping distances on slippery surfaces and risk of loss of control. Repair immediately before driving in adverse weather or emergency braking situations.
Common Causes
35%
Damaged or worn wheel speed sensor reluctor ring (tone ring) with missing teeth, debris buildup, or physical damage causing irregular signal generation
30%
Faulty wheel speed sensor with internal winding degradation, contamination, or moisture intrusion causing erratic signal output
20%
Incorrect wheel speed sensor air gap due to improper installation, bearing wear, or hub damage causing intermittent or incorrect frequency readings
10%
Damaged wiring harness or corroded connectors between wheel speed sensor and ABS module causing signal interference or voltage drops
5%
ABS control module internal failure or software corruption causing misinterpretation of sensor signals
Diagnostic Steps
1
Visually inspect all four wheel speed sensors and tone rings for physical damage, missing teeth, debris accumulation, or signs of contact wear; verify proper sensor mounting and ensure no play in wheel bearings
2
Using scan tool live data, observe individual wheel speed sensor readings while rotating each wheel manually or during a low-speed test drive; identify which sensor(s) show erratic readings, dropouts, or frequency inconsistencies compared to actual wheel rotation
3
Measure the air gap between the suspected wheel speed sensor and reluctor ring using feeler gauges; specification is typically 0.020-0.050 inches (0.5-1.3mm); verify ring runout does not exceed 0.030 inches
4
Test the suspect wheel speed sensor resistance using a digital multimeter (typical range 800-2000 ohms depending on sensor type); inspect wiring harness for chafing, cuts, or corrosion, and perform voltage drop test on signal and ground circuits while wiggling harness
5
Inspect the reluctor ring closely for rust, metallic debris, or missing teeth; clean thoroughly with brake cleaner if contaminated; verify proper reluctor ring installation and that it has not shifted position on the hub or CV axle
6
Clear codes, perform a test drive including ABS activation in a safe area, and verify repair by confirming consistent wheel speed sensor frequency signals match across all four wheels without discrepancies
Estimated Repair Cost
$120 - $650
Parts + labor, varies by vehicle and location
This code indicates that the Anti-lock Braking System (ABS) module has detected an abnormal frequency signal from one or more wheel speed sensors. The sensor is producing a signal that is outside the expected frequency range during wheel rotation, which prevents accurate wheel speed measurement. Thi...
The most common cause of C0245 (Wheel Speed Sensor Frequency Error) is: Damaged or worn wheel speed sensor reluctor ring (tone ring) with missing teeth, debris buildup, or physical damage causing irregular signal generation
Typical repair costs for C0245 range from $120 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Not safe to drive normally as ABS, traction control, and stability control systems will be disabled or malfunctioning, significantly increasing stopping distances on slippery surfaces and risk of loss of control. Repair immediately before driving in adverse weather or emergency braking situations.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C0245 to identify the root cause.
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Quick Info
Category
Chassis
System
Anti-lock Braking System (ABS) / Traction Control / Stability Control
Difficulty
Type
Generic (SAE)
Recommended Tools
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