AutoCodes – Generic – U0011

U0011 Code - Medium Speed CAN Communication Bus 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: U0011 indicates Medium Speed CAN Communication Bus 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 23,036

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 Mar 29, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0011 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 U0011 - Medium Speed CAN Communication Bus Performance - AutoCodes.com — U0011 Code - Medium Speed CAN Communication Bus Performance

What does this mean?

What are the Possible Causes of the DTC U0011?

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 U0011?

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 U0011 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 U0011 code?

Need more information on how to fix the U0011 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0011 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U0011 Chrysler — CAN Communication Interior Bus Performance
U0011 Dodge — CAN Communication Interior Bus Performance
U0011 Jeep — CAN Communication Interior Bus Performance
U0011 RAM — CAN Communication Interior Bus Performance

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 U0011 Code

1. What are the common symptoms of OBDII code U0011 (Medium Speed CAN Communication Bus Performance)?

- Common symptoms include intermittent or complete loss of communication between control modules, dashboard warning lights, and issues with various vehicle systems like ABS, traction control, and airbags.

2. What are the possible causes of OBDII code U0011?

- The code U0011 can be caused by issues such as damaged wiring or connectors in the CAN bus network, faulty control modules, software malfunctions, or a weak battery causing voltage fluctuations.

3. How can I diagnose OBDII code U0011?

- Diagnosing code U0011 typically involves using a professional OBDII scanner to check for communication errors between modules, inspecting the wiring and connectors in the CAN bus network, and performing a thorough system scan to identify the faulty component.

4. Can a DIY enthusiast repair OBDII code U0011 at home?

- While diagnosing the code can be done at home with the right tools, repairing U0011 often requires advanced knowledge of automotive electronics and access to specialized diagnostic equipment. It is recommended to seek professional help for proper repair.

5. Are there any quick tips for fixing OBDII code U0011?

- Quick tips for addressing U0011 may include checking and repairing any damaged wiring or connectors in the CAN bus network, ensuring all control modules are properly connected and functioning, and clearing the code to see if it returns.

6. Is it safe to continue driving with OBDII code U0011 present?

- It is not recommended to drive with OBDII code U0011 present, as it indicates potential issues with critical communication systems in the vehicle. Continuing to drive could lead to further malfunctions and compromise overall safety.

7. How much does it cost to repair OBDII code U0011 at a dealership or repair shop?

- The cost of repairing OBDII code U0011 can vary depending on the underlying cause, the labor rates of the dealership or repair shop, and the price of any replacement parts. It is advisable to get a diagnosis and estimate before proceeding with repairs.

8. Can OBDII code U0011 be a recurring issue even after repair?

- Yes, OBDII code U0011 can potentially recur if the root cause of the problem is not properly addressed during the initial repair. Thorough diagnosis and repair of all related components are essential to prevent the code from reappearing.

9. Will disconnecting the battery reset OBDII code U0011?

- Disconnecting the battery may temporarily clear the code, but it will not fix the underlying issue causing code U0011. It is important to diagnose the problem accurately and address it properly to prevent the code from returning.

10. What should I do if OBDII code U0011 keeps coming back after repair attempts?

- If OBDII code U0011 keeps recurring after repair attempts, it is advisable to seek the expertise of a professional mechanic or dealership with experience in diagnosing and repairing complex communication network issues.