What Does C1233 Mean?
The ABS module has detected that the right front wheel speed sensor circuit is either open or shorted. The module cannot receive a valid speed signal from this corner, which disables ABS and traction control. The driver will see ABS and TC warning lights and may notice the ABS does not engage during hard braking.
Common Causes
35%
Failed right front wheel speed sensor (open or shorted winding)
30%
Damaged wiring in the right front sensor circuit — broken, chafed, or corroded
20%
Corroded or disconnected sensor connector
10%
Damaged tone ring on the right front hub assembly
5%
ABS module internal input failure for the right front channel
Diagnostic Steps
1
Measure sensor resistance at the right front wheel speed sensor connector — expect 800-2000 ohms. An open reading (OL) indicates a broken sensor winding or severed wire. A dead short (near 0 ohms) indicates an internal short.
2
Check for shorts to ground and shorts to battery on both signal wires at the sensor connector using a DVOM — neither wire should have continuity to ground or show voltage with the sensor disconnected.
3
Inspect the right front sensor harness where it routes along the steering knuckle and through the wheel well — this is a high-abuse area prone to damage from road debris, ice, and steering movement.
4
Verify the sensor is properly seated in the knuckle bore and the connector is fully locked. A sensor that has backed out will show erratic or no signal.
5
If the sensor tests good at its connector, perform end-to-end continuity and resistance tests from the sensor to the ABS module connector pins to isolate a harness fault.
Estimated Repair Cost
$80 - $350
Parts + labor, varies by vehicle and location
The ABS module has detected that the right front wheel speed sensor circuit is either open or shorted. The module cannot receive a valid speed signal from this corner, which disables ABS and traction control. The driver will see ABS and TC warning lights and may notice the ABS does not engage during...
The most common cause of C1233 (Right Front Wheel Speed Circuit Open or Shorted) is: Failed right front wheel speed sensor (open or shorted winding)
Typical repair costs for C1233 range from $80 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
ABS and traction control are disabled on the right front corner. Standard braking works normally but anti-lock braking will not activate. Use caution during hard braking and on low-traction surfaces. Safe to drive at moderate speeds to a repair shop.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1233 to identify the root cause.
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Quick Info
Category
Chassis
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ABS / Traction Control
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