AutoCodes – Generic – U0037

U0037 Code - Vehicle Communication Bus 'B'

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: U0037 indicates Vehicle Communication Bus 'B'.
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 19,523

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 U0037 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 U0037 - Vehicle Communication Bus 'B' - AutoCodes.com — U0037 Code - Vehicle Communication Bus 'B'

What does this mean?

What are the Possible Causes of the DTC U0037?

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 U0037?

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 U0037 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 U0037 code?

Need more information on how to fix the U0037 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0037 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U0037 Chrysler — LIN Communication Bus Circuit short To Ground
U0037 Dodge — LIN Communication Bus Circuit short To Ground
U0037 Jeep — LIN Communication Bus Circuit short To Ground
U0037 RAM — LIN Communication Bus Circuit short To Ground

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 U0037 Code

1. What does the OBDII code U0037 mean?

The code U0037 indicates a problem with the Vehicle Communication Bus 'B'.

2. What are the common symptoms of OBDII code U0037?

Common symptoms of U0037 may include issues with communication between various control modules in the vehicle, erratic behavior of electronic systems, and warning lights on the dashboard.

3. What are the possible causes of OBDII code U0037?

Potential causes of U0037 include damaged wiring or connectors in the communication network, faulty control modules, software malfunctions, or a problem with the vehicle's battery or charging system.

4. How can I diagnose the OBDII code U0037?

Diagnosing U0037 typically involves using a professional OBDII scanner to retrieve the trouble codes, checking the network communication between control modules, inspecting wiring and connectors, and testing the vehicle's battery and charging system.

5. Can I still drive my vehicle with the OBDII code U0037 present?

It is not recommended to drive the vehicle with the U0037 code present, as it can lead to further electrical problems and affect the performance and safety of the vehicle.

6. How can I repair OBDII code U0037?

Repairing U0037 may involve repairing or replacing damaged wiring or connectors, reprogramming control modules, updating software, or replacing faulty components after a thorough diagnostic process.

7. Is it necessary to clear the OBDII code U0037 after making repairs?

Yes, it is important to clear the U0037 code after making repairs to reset the system and ensure that the issue has been resolved. Failure to clear the code may result in the reoccurrence of the problem.

8. Can a DIY enthusiast fix the OBDII code U0037?

While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing U0037 may require advanced knowledge, specialized tools, and expertise. It is advisable to seek professional help if needed.

9. How much does it cost to fix the OBDII code U0037?

The cost of fixing U0037 can vary depending on the underlying cause, the extent of the repair needed, and labor rates in your area. It is recommended to obtain quotes from automotive professionals for an accurate estimate.

10. How can I prevent the OBDII code U0037 from occurring again?

To prevent the U0037 code from reoccurring, it is essential to maintain the vehicle's electrical system, perform regular inspections, address any warning signs promptly, and follow the manufacturer's maintenance schedule.