Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is getting a signal from the right front wheel that is too strong. It's like the wheel is shouting when it should just be talking normally.
The wheel speed sensor measures how fast the wheel is turning. If the signal is too high, it might mean the sensor is malfunctioning or there's an electrical issue.
The C123C code indicates that the Anti-lock Braking System (ABS) module has detected an unusually high voltage signal from the right front wheel speed sensor. This could be due to a sensor fault, wiring issue, or a problem with the ABS module itself.
• ABS warning light on
• Traction control light on
• Inconsistent or erratic braking
• Faulty wheel speed sensor
• Damaged wiring or connectors
• Faulty ABS module
ABS: Anti-lock Braking System
OBD-II: On-Board Diagnostics, second generation
• Inspect the right front wheel speed sensor and wiring for damage.
• Use a multimeter to check the voltage output of the sensor.
• Test the ABS module for faults.
• Replace the faulty wheel speed sensor.
• Repair or replace damaged wiring or connectors.
• Replace the ABS module if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Dodge Charger
• Jeep Grand Cherokee
• Chrysler 300
• Regularly inspect wheel speed sensors and wiring.
• Avoid driving through deep water.
• Perform regular maintenance checks.
Sensor Issue
• Do not ignore the ABS warning light.
• Have the vehicle inspected by a professional if unsure.
• Drive cautiously until the issue is resolved.
Check with the vehicle manufacturer for warranty coverage on ABS components.
The C123C code has been associated with sensor failures in vehicles with high mileage or those exposed to harsh conditions.
Moderate – While the vehicle can still be driven, braking performance may be compromised.
Driving with a faulty ABS system can increase stopping distances and the risk of skidding.
• Vehicle stationary
• Ignition on
The right front wheel speed sensor is located near the brake rotor on the right front wheel.
Q: Can I drive with a C123C code?
A: It's possible to drive, but the ABS system may not function properly, increasing the risk of skidding.
Q: How do I reset the ABS light?
A: Fix the underlying issue first, then use an OBD-II scanner to clear the code.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
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Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.