OBD-II trouble code
U0124: Lost Communication with Lateral Acceleration Sensor Module
A module on the network can no longer hear from the lateral acceleration sensor module, which measures side-to-side g-force for the stability system. Usually a power, ground, or wiring fault, it typically disables stability control and lights the ESC and ABS warnings.
Quick facts
- System
- Network
- Category
- Network Communication
- Severity
- High severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $130 – $900
- DIY difficulty
- Advanced DIY
What does U0124 mean?
U0124 is set when a module on the vehicle's communication network — usually the stability or ABS controller — stops receiving messages from the lateral acceleration sensor module. The lateral acceleration sensor measures side-to-side g-force, the cornering load the vehicle experiences in a turn. Electronic stability control uses this alongside yaw rate, steering angle, and wheel speeds to judge whether the vehicle is following the driver's intended path. On many vehicles the lateral acceleration and yaw rate sensors share a single module. When the network loses contact with it, U0124 records that the sensor module has gone silent.
The causes are the standard lost-communication faults. The module may have lost power or ground through a blown fuse, corroded ground, or failed relay. The communication wiring or a connector at the module can be damaged, chafed, or corroded. The module's internal communication circuitry can fail, or another module on the bus can disrupt the network. Low 12-volt system voltage commonly causes intermittent dropouts.
Without lateral acceleration data, the stability system can't accurately read cornering forces, so it disables stability and traction control as a fail-safe and lights the ESC and ABS warnings, often with the check engine light. Base brakes and steering still work, so the vehicle is driveable, but the electronic safety net against skids is offline. Because the affected functions are safety systems, U0124 should be diagnosed promptly.
Common causes
- Blown power or ground fuse for the lateral acceleration sensor module
- Corroded or loose ground at the sensor module
- Damaged or chafed communication wiring to the module
- Corroded or backed-out terminals at the module connector
- Failed internal communication circuitry in the sensor module
- Another module on the bus disrupting network communication
- Low 12-volt system voltage from a weak or failing battery
- Sensor module knocked loose or damaged (it is often floor-mounted)
Symptoms
- Stability control (ESC) and traction control warning lights on
- ABS warning light on
- Check engine light may also be on
- Stability and traction control disabled
- Scan tool can't communicate with the lateral acceleration sensor module
- Base brakes and steering still function normally
- Symptoms may be intermittent with a marginal connection
Diagnostic steps
- 1.Scan all modules; confirm the lateral acceleration sensor module is unreachable while others respond.
- 2.Check the module's power and ground fuses, relays, and ground points.
- 3.Inspect the communication wiring and connector at the module for chafing, corrosion, and loose terminals.
- 4.Verify the sensor module is securely mounted and undamaged, since it is often located low in the vehicle.
- 5.Measure the communication bus lines at the module connector and verify continuity back to the bus.
- 6.Test the 12-volt battery and charging, since low voltage can cause intermittent communication loss.
- 7.If power, ground, and wiring are good but the module still won't communicate, suspect an internal sensor-module fault requiring replacement and possibly calibration.
Repair cost
$130 – $900
A blown fuse, corroded ground, or connector repair is the cheapest fix at $130-$350 once located. Wiring repair runs $200-$600. Diagnostic time often adds $100-$200. Replacing a lateral acceleration / combined dynamics sensor module typically runs $300-$900 including any required calibration, and is a last resort after wiring, power, and ground are ruled out.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with module communication / can bus diagnosis preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
This is an advanced DIY job. It typically requires specialty tools, scan-tool access, lifting equipment, or careful sequencing to avoid causing new failures. Plan for extended downtime and have a backup vehicle. Most owners are better served by a shop that has done this repair before.