AutoCodes – GMC – C1284 GMC

C1284 GMC Code - Lateral Accelerometer Sensor Bias Malfunction

Quick Answer

The Vehicle Stability Enhancement System (VSES) is activated by the Electronic Brake Control Module (EBCM) calculating the desired yaw rate and comparing it to the actual yaw rate input. Common causes include Faulty Steering Wheel Position Sensor (SWPS), Faulty Lateral Accelerometer Sensor, Faulty Electronic Brake Control Module (EBCM). Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: C1284 GMC indicates Lateral Accelerometer Sensor Bias Malfunction.
Common causes: Common causes include Faulty Steering Wheel Position Sensor (SWPS), Faulty Lateral Accelerometer Sensor, Faulty Electronic Brake Control Module (EBCM).
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,165

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1284 GMC Description

The Vehicle Stability Enhancement System (VSES) is activated by the Electronic Brake Control Module (EBCM) calculating the desired yaw rate and comparing it to the actual yaw rate input. The desired yaw rate is calculated from measured steering wheel position, vehicle speed, and lateral acceleration. The difference between the desired yaw rate and actual yaw rate is the yaw rate error, which is a measurement of oversteer or understeer. If the yaw rate error becomes too large, the EBCM will attempt to correct the vehicle's yaw motion by applying differential braking to the left or right front wheel.
The amount of differential braking applied to the left or right front wheel is based on both the yaw rate error and side slip rate error. The side slip rate error is a function of the lateral acceleration minus the product of the yaw rate and vehicle speed. The yaw rate error and side slip rate error are combined to produce the total delta velocity error. When the delta velocity error becomes too large and the VSES system activates, the drivers steering inputs combined with the differential braking will attempt to bring the delta velocity error toward zero.
The VSES activations generally occur during aggressive driving, in the turns or bumpy roads without much use of the accelerator pedal. When braking during VSES activation, the brake pedal will feel different than the ABS pedal pulsation. The brake pedal pulsates at a higher frequency during VSES activation.

OBDII Code C1284 GMC - Lateral Accelerometer Sensor Bias Malfunction - AutoCodes.com — C1284 GMC Code - Lateral Accelerometer Sensor Bias Malfunction

What does this mean?

What are the Possible Causes of the DTC C1284 GMC?

Faulty Steering Wheel Position Sensor (SWPS)
Faulty Lateral Accelerometer Sensor
Faulty Electronic Brake Control Module (EBCM)
Lateral Accelerometer Sensor harness is open or shorted
Lateral Accelerometer Sensor circuit poor electrical connection

How to Fix the DTC C1284 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1284 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1284 GMC Code

1. What are the common symptoms of OBDII code C1284 GMC (Lateral Accelerometer Sensor Bias Malfunction)?

The common symptoms include the traction control and stability control lights illuminating on the dashboard, erratic or incorrect readings from the lateral accelerometer sensor, and potential issues with the vehicle's stability and handling.

2. What causes the OBDII code C1284 GMC to trigger?

The code C1284 typically triggers due to a malfunction in the lateral accelerometer sensor, which can be caused by sensor failure, wiring issues, or calibration errors.

3. How can I diagnose the Lateral Accelerometer Sensor Bias Malfunction?

Diagnosing this issue usually involves using a diagnostic scanner to read the trouble code, inspecting the lateral accelerometer sensor and its wiring for any damage or corrosion, and performing calibration tests to determine the sensor's accuracy.

4. Can I drive my vehicle with the C1284 code present?

While the vehicle may still be drivable with this code, it is not recommended to ignore the issue, as it can affect the stability and safety systems of the vehicle. It's best to address the problem promptly.

5. How can I repair the Lateral Accelerometer Sensor Bias Malfunction?

Repairing this issue may involve replacing the lateral accelerometer sensor if it is found to be faulty, repairing any damaged wiring, or recalibrating the sensor to ensure accurate readings.

6. Is it possible to reset the C1284 trouble code without fixing the underlying issue?

Resetting the trouble code without addressing the root cause will only temporarily clear the code. The issue will likely reappear until the underlying problem is resolved.

7. How much does it typically cost to repair the Lateral Accelerometer Sensor Bias Malfunction?

The cost of repairing this issue can vary depending on the extent of the problem, the specific repairs needed, and the labor rates of the repair shop. It's best to consult with a professional technician for an accurate estimate.

8. Can a DIY enthusiast fix the C1284 code at home?

While some DIY enthusiasts may have the skills to diagnose and repair this issue, it is recommended to seek professional help, especially when dealing with sensitive safety systems like stability control.

9. Are there any preventive maintenance tips to avoid the Lateral Accelerometer Sensor Bias Malfunction?

Regularly inspecting the sensor and its wiring for damage, keeping the sensor clean, and following the manufacturer's recommended maintenance schedule can help prevent issues with the lateral accelerometer sensor.

10. Will the C1284 code cause the vehicle to fail an emissions test?

The C1284 code is not directly related to emissions, so it should not cause the vehicle to fail an emissions test. However, it's important to address the issue to ensure the overall safety and performance of the vehicle.