Longitudinal Accelerometer Sensor Circuit Malfunction
What does C0228 mean?
The C0228 code means the vehicle's onboard diagnostic system has detected: Longitudinal Accelerometer Sensor Circuit Malfunction. This is a critical severity code.
Common Symptoms
- Stability control disabled
- Traction control light on
- Service ESC or StabiliTrak message
- Hill start assist disabled
- Brake assist system inoperative
Probable Causes (Ranked by Likelihood)
- Failed longitudinal accelerometer sensor Very High
- Corroded sensor electrical connector High
- Wiring fault between sensor and ESC module Moderate
- Sensor mounting issue affecting readings Moderate
- ESC module input circuit failure Low
Step-by-Step Diagnostic Procedure
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Scan for DTCs and check longitudinal acceleration live data
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Locate the sensor -- typically integrated with the yaw rate sensor unit
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Inspect connector for water damage, corrosion, or bent pins
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Verify sensor mounting is secure and correctly oriented
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Test sensor response by monitoring data during gentle acceleration and braking
Frequently Asked Questions
What does the longitudinal accelerometer measure?
The longitudinal accelerometer measures forward and backward (front-to-rear) G-forces on the vehicle. It detects acceleration and deceleration, which the stability control system uses along with other sensors to maintain vehicle stability.
Is the longitudinal accelerometer in the same unit as the yaw rate sensor?
On most modern vehicles, yes. The longitudinal accelerometer, lateral accelerometer, and yaw rate sensor are often combined in a single inertial measurement unit (IMU) mounted near the center of the vehicle.
What other systems use the longitudinal accelerometer?
Besides stability control, it is used by hill start assist, brake assist, collision avoidance systems, and some adaptive suspension systems to measure vehicle motion.