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AutoCodes – Generic – U0047

U0047 Code - Vehicle Communication Bus 'C' Performance

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Diagnosis of this Diagnostic Trouble Code (DTC) is accomplished via the vehicle symptom(s), Check for more codes, Faulty Control Module. 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
U0047 indicates Vehicle Communication Bus 'C' Performance.
Common causes
Common causes include Diagnosis of this Diagnostic Trouble Code (DTC) is accomplished via the vehicle symptom(s), Check for more codes, Faulty Control Module.
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 8,952
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 29, 2020
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Code U0047 Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a supervised periodic message that includes the transmitter device availability has not been received.
OBDII Code U0047 - Vehicle Communication Bus 'C' Performance - AutoCodes.com
U0047 Code - Vehicle Communication Bus 'C' Performance
What does this mean?

What are the Possible Causes of the DTC U0047?

  • Diagnosis of this Diagnostic Trouble Code (DTC) is accomplished via the vehicle symptom(s)
  • Check for more codes
  • Faulty Control Module
  • Control Module harness is open or shorted
  • Control Module circuit poor electrical connection

How to Fix the DTC U0047?

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 U0047 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 U0047 code?

Need more information on how to fix the U0047 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0047 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

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 U0047 Code

1. What does the OBDII code U0047 mean?

U0047 indicates a problem with the Vehicle Communication Bus 'C', which is responsible for transmitting data between different modules in the vehicle.

2. What are the common symptoms of code U0047?

Symptoms may include warning lights on the dashboard, erratic vehicle behavior, communication errors between modules, or failure of certain vehicle systems.

3. What causes code U0047 to appear?

Code U0047 can be caused by damaged wiring, loose or corroded connections, faulty control modules, or software issues impacting the communication bus.

4. Can driving with code U0047 damage my vehicle?

Driving with U0047 may lead to inconsistent performance or failure of critical systems, so addressing the issue promptly is recommended.

5. How do I diagnose code U0047?

Diagnosis involves inspecting the wiring and connectors for damage, using a scan tool to check communication between modules, and potentially performing a continuity test on the bus 'C' network.

6. What repairs can fix code U0047?

Repairs may include replacing damaged wiring, cleaning or tightening connections, updating module software, or replacing a faulty module.

7. Is code U0047 specific to certain vehicles?

No, U0047 can occur in any vehicle equipped with an OBDII system that uses a Vehicle Communication Bus 'C'.

8. Will resetting the code fix U0047 permanently?

Resetting the code may temporarily clear it, but the underlying issue must be resolved to prevent the code from returning.

9. How much does it cost to repair code U0047?

Costs vary depending on the root cause, but minor wiring repairs or connector cleaning are generally less expensive than replacing control modules.

10. Can a failing battery cause code U0047?

Yes, a weak or failing battery can result in communication issues, potentially triggering code U0047.

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