Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with a sensor that measures vacuum pressure in the car. It's like a broken thermometer that can't tell you the temperature.
The C054D code indicates that the vehicle's computer has detected an issue in the circuit of the vacuum sensor B, which is responsible for measuring the vacuum pressure in the system.
The C054D code is set when the Powertrain Control Module (PCM) detects an open circuit or a malfunction in the vacuum sensor B. This sensor is crucial for monitoring and maintaining the proper vacuum levels required for various engine and vehicle operations.
• Check Engine Light is on
• Poor engine performance
• Erratic idling
• Faulty vacuum sensor B
• Damaged or corroded wiring/connectors
• Open circuit in the vacuum sensor B circuit
PCM: Powertrain Control Module
OBD-II: On-Board Diagnostics, second generation
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the vacuum sensor B for proper operation.
• Replace the faulty vacuum sensor B.
• Repair or replace damaged wiring/connectors.
• Clear the code and test drive the vehicle to ensure the issue is resolved.
• OBD-II scanner
• Multimeter
• Screwdriver set
$100 - $300
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect and maintain vehicle sensors.
• Ensure wiring and connectors are secure and free from damage.
• Perform routine vehicle diagnostics.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Regular maintenance can prevent sensor issues.
Check with your vehicle manufacturer for warranty coverage on sensor replacements.
This code has been associated with vehicles that have vacuum-related issues, often due to sensor or wiring problems.
Moderate – While the vehicle may still be drivable, it is recommended to address this issue promptly to avoid further complications.
Driving with a malfunctioning sensor can lead to increased emissions and potential engine damage.
• Engine running
• Vehicle at operating temperature
The vacuum sensor B is typically located near the intake manifold or within the engine bay.
Q: Can I drive with a C054D code?
A: While the vehicle may still be drivable, it's best to address the issue to prevent potential engine performance problems.
Q: How can I clear the C054D code?
A: After repairs, use an OBD-II scanner to clear the code and ensure it doesn't return.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
View on Amazon
Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
View on Amazon
Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.