Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble communicating with a sensor that helps it understand how fast the car is speeding up or slowing down in a straight line.
The longitudinal acceleration sensor is responsible for measuring the rate of acceleration or deceleration of the vehicle. This code indicates a problem with the sensor's circuit, such as an open circuit or faulty connection.
The C0551 code is triggered when the vehicle's control module detects an open circuit or malfunction in the longitudinal acceleration sensor circuit. This sensor is crucial for systems like traction control and stability control, which rely on accurate acceleration data to function properly.
• Traction control light illuminated
• Stability control system malfunction
• Possible ABS light on
• Faulty longitudinal acceleration sensor
• Damaged wiring or connectors
• Faulty control module
Longitudinal Acceleration: The rate of change of velocity of the vehicle in a straight line.
OBD-II: On-Board Diagnostics II, a standardized system for self-diagnostics and reporting in vehicles.
• Inspect the sensor and its wiring for damage.
• Check for loose or corroded connectors.
• Test the sensor's signal with a multimeter.
• Replace the longitudinal acceleration sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the control module if necessary.
• Multimeter
• OBD-II scanner
• Screwdriver set
$150 - $500
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect sensor connections.
• Avoid driving in harsh conditions that may damage wiring.
• Schedule regular vehicle maintenance checks.
Sensor Issue
• Do not ignore the warning lights on the dashboard.
• Have the vehicle inspected by a professional as soon as possible.
Check with the vehicle manufacturer for warranty coverage on sensor-related repairs.
This code has been commonly reported in vehicles with advanced traction and stability control systems, especially in models from the early 2000s.
Moderate – While the vehicle may still be drivable, traction and stability control systems may not function properly.
Driving with a malfunctioning sensor can compromise vehicle safety systems. Address the issue promptly to ensure safe operation.
• Vehicle must be on a level surface.
• Ensure all electrical connections are secure.
The longitudinal acceleration sensor is typically located near the center of the vehicle, often under the floor or near the transmission tunnel.
Q: Can I drive with a C0551 code?
A: While the vehicle may still be drivable, it's important to address the issue as soon as possible to ensure safety systems are functioning.
Q: How do I reset the C0551 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is resolved, the code should not return.
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