C1456: Front Longitudinal Accelerometer Signal Loss
Diagnostic trouble code C1456 indicates that the chassis control module (typically the VSA/ABS module) is not receiving a signal or communication from the front longitudinal accelerometer. This sensor, which may be integrated into the stability control module or mounted separately, measures longitudinal G-force (acceleration and deceleration) to calculate vehicle dynamics during braking and acceleration. The fault is caused by an open circuit, short circuit, or lack of sensor response, which disables stability assist functions that rely on longitudinal tilt measurement.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty or damaged front longitudinal accelerometer sensor
- Open or short circuit in the wiring between the sensor and the VSA/ABS module
- Corroded, disconnected, or damaged pins in the sensor connector
- Internal failure of the VSA (Vehicle Stability Assist) module or its integrated sensor assembly
- Incorrect installation or misalignment of the sensor after previous repairs
3. Symptoms You Will Notice
- Illuminated VSA, ABS, or check engine light on the dashboard
- Loss of stability control, traction control, or hill-start assist functions
4. Step-by-Step Diagnosis
Scan the vehicle's OBD2 system to confirm code C1456 and check for related codes.
Visually inspect the accelerometer sensor connector and wiring for damage, corrosion, or loose connections.
Test the sensor's power, ground, and signal circuits using a multimeter per manufacturer specifications.
If circuits are intact, replace the longitudinal accelerometer sensor and clear the code.
If the code returns, test the VSA module for internal faults or perform a module reprogramming/replacement.
5. Frequently Asked Questions
Is it safe to drive?▼
You can drive, but stability and traction control systems will be disabled, increasing the risk of skidding or loss of control in slippery conditions. Have it diagnosed soon.
How much does it cost to fix?▼
Repair costs typically range from $150 to $600, depending on whether the sensor ($50–$200) or the VSA module ($300–$600) needs replacement, plus labor.