C1254 2018 GMC Sierra Code - Longitudinal Acceleration Sensor Performance
Quick Answer
The Yaw Rate, Lateral Acceleration, and Longitudinal Acceleration Sensors are combined into one Multi-Axis Acceleration Sensor, internal to the Inflatable Restraint Sensing and Diagnostic Module. Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module circuit poor electrical connection. 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
- C1254 2018 GMC Sierra indicates Longitudinal Acceleration Sensor Performance.
- Common causes
- Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module circuit poor electrical connection.
- 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.
Code C1254 2018 GMC Sierra Description
What are the Possible Causes of the DTC C1254 2018 GMC Sierra?
- Faulty Transmission Control Module (TCM)
- Transmission Control Module harness is open or shorted
- Transmission Control Module circuit poor electrical connection
- Faulty Electronic Brake Control Module (EBCM)
How to Fix the DTC C1254 2018 GMC Sierra?
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 C1254 2018 GMC Sierra 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.
Need more information about the C1254 2018 GMC Sierra code?
Need more information on how to fix the C1254 2018 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the C1254 2018 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about C1254 2018 GMC Sierra Code
1. What does the OBDII code C1254 mean on a 2018 GMC Sierra?
The code C1254 indicates an issue with the longitudinal acceleration sensor’s performance, which is part of the vehicle's stability control system.
2. What are common symptoms of code C1254 in a 2018 GMC Sierra?
Symptoms may include the ABS or traction control warning light being illuminated, reduced vehicle stability, and erratic behavior of the stability control system.
3. What causes the C1254 code in my 2018 GMC Sierra?
Common causes include a faulty longitudinal acceleration sensor, poor electrical connections, damaged wiring, or an issue with the ABS control module.
4. Can I drive my 2018 GMC Sierra with the C1254 code?
While the vehicle may still be drivable, stability control and ABS functionality could be compromised, posing a safety risk in certain driving conditions.
5. How do I fix the C1254 code on my GMC Sierra?
Repairs may involve inspecting and replacing the longitudinal acceleration sensor, repairing damaged wiring or connectors, and ensuring proper calibration of the stability control system.
6. Where is the longitudinal acceleration sensor located in a 2018 GMC Sierra?
The sensor is typically located near the center of the vehicle, often under the center console or seat, depending on the model.
7. How can I diagnose the C1254 code?
Diagnosis involves scanning the vehicle with an OBDII scanner, inspecting the sensor and its wiring, and testing the sensor’s output using specialized tools.
8. Does the C1254 code require recalibration after repairs?
Yes, after replacing or repairing the sensor, the stability control system may need recalibration using a GM-specific scan tool.
9. How much does it cost to fix the C1254 code on a 2018 GMC Sierra?
Repair costs can range from $100 to $500, depending on whether the issue is a simple wiring repair or a sensor replacement.
10. Can a weak battery cause the C1254 code?
A weak or failing battery can sometimes cause communication errors in the vehicle’s systems, potentially triggering the C1254 code.
Discuss the causes and fixes for C1254 2018 GMC Sierra OBDII Code
Code C1254 2018 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
