U0123 — Lost Communication With Yaw Rate Sensor Module

vehicle network

Is it safe to drive?

Drive with caution The base brakes usually still work, so careful driving is possible — but ABS and stability control are disabled, which lengthens stopping distances on slippery roads. Fix promptly and avoid harsh driving.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm U0123 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many U0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the ABS / stability control for damage, corrosion, chafing or poor contact.
Subsystem check Read all four wheel speed PIDs while driving slowly — the faulty sensor drops out or reads implausibly.
Subsystem check Inspect the sensor and tone ring for metal debris and damage near the hub.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U0123 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for U0123 (parts and labor, USD, independent shop rates): Replace a wheel speed sensor: $120–$350; Repair sensor wiring: $80–$250; ABS module repair or replacement: $400–$1,200. Overall, fixing U0123 usually costs between $80 and $1,200. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What does OBD2 code U0123 mean?

Lost Communication With Yaw Rate Sensor Module (U0123): a vehicle network fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by damaged sensor wiring or corroded connector, failed wheel speed sensor, damaged tone (reluctor) ring on the hub.

Will U0123 clear itself?

Sometimes U0123 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What are the symptoms of U0123?

Drivers most often notice: ABS or ESC warning light on, brake pedal pulsation changes, speedometer or cruise control issues, stability control disabled message.

What is the most common cause of U0123?

The most common causes are: damaged sensor wiring or corroded connector, failed wheel speed sensor, damaged tone (reluctor) ring on the hub.

Is it safe to drive with U0123?

The base brakes usually still work, so careful driving is possible — but ABS and stability control are disabled, which lengthens stopping distances on slippery roads. Fix promptly and avoid harsh driving.

What does U0123 mean?

Seeing U0123 on your scanner? The control unit has caught the ABS / stability control operating outside its calibrated window. The formal description is “Lost Communication With Yaw Rate Sensor Module”, and the code is grouped under vehicle network faults.

To set U0123, the control module compares live readings of the ABS / stability control against calibrated limits, usually over several drive cycles. Alongside the code it stores a freeze frame — a snapshot of rpm, load, coolant temperature and vehicle speed at the moment of failure. Reading that snapshot first saves diagnostic time.

What causes U0123?

faulty ABS module or pump motor
damaged sensor wiring or corroded connector
failed wheel speed sensor
damaged tone (reluctor) ring on the hub
blown fuse or low voltage to the ABS module

Common symptoms of U0123

ABS or ESC warning light on
brake pedal pulsation changes
speedometer or cruise control issues
stability control disabled message
ABS not operating during hard braking

How to diagnose U0123

Connect an OBD2 scanner, confirm U0123 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many U0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Visually inspect the wiring harness and connectors related to the ABS / stability control for damage, corrosion, chafing or poor contact.
Read all four wheel speed PIDs while driving slowly — the faulty sensor drops out or reads implausibly.
Inspect the sensor and tone ring for metal debris and damage near the hub.
Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U0123 does not return.

How to fix U0123

Start with the cheapest and most common causes before replacing expensive parts:

Replace a wheel speed sensor — $120–$350
Repair sensor wiring — $80–$250
ABS module repair or replacement — $400–$1,200

How much does it cost to fix U0123?

Repair cost depends on which component actually failed. Typical scenarios for U0123 (parts and labor, USD, independent shop rates):

Replace a wheel speed sensor: $120–$350
Repair sensor wiring: $80–$250
ABS module repair or replacement: $400–$1,200

Overall, fixing U0123 usually costs between $80 and $1,200. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.