AutoCodes – Generic – U0024

U0024 Code - Low Speed CAN Communication Bus (-) Open

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: U0024 indicates Low Speed CAN Communication Bus (-) Open.
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 15,868

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 U0024 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 U0024 - Low Speed CAN Communication Bus (-) Open - AutoCodes.com — U0024 Code - Low Speed CAN Communication Bus (-) Open

What does this mean?

What are the Possible Causes of the DTC U0024?

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 U0024?

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 U0024 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 U0024 code?

Need more information on how to fix the U0024 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0024 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U0024 Chrysler — Low Speed CAN Communication Bus Open
U0024 Dodge — Low Speed CAN Communication Bus Open
U0024 Jeep — Low Speed CAN Communication Bus Open

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 U0024 Code

1. What are the common symptoms of OBDII code U0024 (Low Speed CAN Communication Bus (-) Open)?

Symptoms may include issues with the vehicle's communication network, such as loss of connection with various control modules, warning lights on the dashboard, and difficulty diagnosing other codes.

2. What are some possible causes of the U0024 code?

Common causes include a broken or disconnected wire in the Low Speed CAN bus circuit, faulty wiring harness, loose connections, or a defective control module.

3. How does a Low Speed CAN communication bus (-) open affect the vehicle's performance?

This issue can lead to communication breakdowns between different modules in the vehicle, resulting in a loss of functionality for various systems like the transmission, ABS, and airbags.

4. What are some diagnostic steps to troubleshoot the U0024 code?

Diagnosing this code usually involves inspecting the wiring harness for any damage, checking connectors for tightness, and using a multimeter to test for continuity in the Low Speed CAN bus circuit.

5. Can a U0024 code be repaired by the vehicle owner?

Repairing the Low Speed CAN Communication Bus (-) Open issue often requires advanced diagnostic equipment and knowledge of automotive electrical systems, so it is recommended to consult a professional mechanic.

6. Is driving the vehicle with the U0024 code safe?

Continuing to drive with this code present may pose a risk as it can affect the operation of critical vehicle systems. It is advisable to address this issue promptly to ensure safe driving conditions.

7. How much does it cost to repair a U0024 code?

The cost of repairing the Low Speed CAN Communication Bus (-) Open fault can vary depending on the underlying cause, parts needed, and labor rates. It's best to obtain estimates from local repair shops.

8. Can a U0024 code be intermittent?

Yes, the U0024 code can sometimes be intermittent, meaning the issue may come and go. It is essential to address intermittent faults promptly to prevent potential long-term damage.

9. Will resetting the trouble codes make the U0024 code disappear?

Resetting the trouble codes may temporarily clear the code, but if the underlying issue causing the U0024 code is not addressed, it is likely to reappear during vehicle operation.

10. How long does it typically take to repair a U0024 code?

The repair time for a U0024 code can vary based on the specific cause of the fault and the complexity of the repair. Simple fixes may take less time, while more intricate issues could require more extensive troubleshooting.

Discuss the causes and fixes for U0024 OBDII Code

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Tim
Date: June 7, 2018 at 2:01 pm

i have a 2012 dodge avenger with code u0024 what could the fix be

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OBDIITech
Date: June 8, 2018 at 1:35 am

The code means that there is a problem with the CAN system. The CAN system is used by control unit to communicate with each other. Have you tried clearing the code? any other symptoms?

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