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Engine-Codes – Generic – U0068

U0068 Code - Vehicle Communication Bus 'E' (+) High

Quick Answer

The U0068 diagnostic trouble code (DTC) indicates that there is a malfunction in the Vehicle Communication Bus 'E' (+) High circuit. Common causes include Damaged wiring or connectors in the Vehicle Communication Bus 'E' (+) High circuit, Corrosion on connectors or terminals, 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
U0068 indicates Vehicle Communication Bus 'E' (+) High.
Common causes
Common causes include Damaged wiring or connectors in the Vehicle Communication Bus 'E' (+) High circuit, Corrosion on connectors or terminals, 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code U0068 Description

The U0068 diagnostic trouble code (DTC) indicates that there is a malfunction in the Vehicle Communication Bus 'E' (+) High circuit. This communication bus is a network that allows various control modules within the vehicle to communicate with each other. When the voltage on the 'E' positive high side of the communication bus is outside of the expected range, it can lead to communication issues between modules, resulting in various electrical and performance issues in the vehicle.

OBDII Code U0068 - Vehicle Communication Bus 'E' (+) High
U0068 Code - Vehicle Communication Bus 'E' (+) High

Common Causes of U0068

  1. Damaged wiring or connectors in the Vehicle Communication Bus 'E' (+) High circuit
  2. Corrosion on connectors or terminals
  3. Faulty control module
  4. Electrical interference
  5. Poor grounding

Symptoms of U0068

  1. Intermittent loss of power
  2. Rough idling
  3. Stalling
  4. Poor fuel economy
  5. Difficulty starting

How to Fix U0068

  1. Perform a thorough inspection of the wiring, connectors, and control modules in the Vehicle Communication Bus 'E' (+) High circuit.
  2. Repair or replace any damaged wiring or connectors.
  3. Clean or replace corroded connectors or terminals.
  4. Test and replace any faulty control modules.
  5. Ensure proper grounding and shielding to prevent electrical interference.

Cost to Fix U0068

The cost of repairing a U0068 code can vary depending on the extent of the issue and the specific repairs needed. In general, the typical repair costs for this issue can range from $200 to $500, including parts and labor. However, it's important to note that the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to consult with a professional mechanic to get an accurate estimate for your specific situation.

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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 U0068 Code

What does the OBDII code U0068 mean?

Code U0068 indicates that there is a high voltage issue with the Vehicle Communication Bus 'E' (+), which is part of the vehicle's communication network.

What are the common symptoms of code U0068?

Symptoms may include warning lights on the dashboard, intermittent communication issues between modules, and difficulty diagnosing or clearing other codes.

What causes the U0068 code?

Common causes include damaged wiring, loose or corroded connectors, a short circuit, or a malfunctioning control module.

Can code U0068 affect vehicle performance?

Yes, it can impact vehicle performance by disrupting communication between critical systems like the engine, transmission, or safety modules.

How can I diagnose the U0068 code?

Start by inspecting the wiring and connectors related to the communication bus for damage or corrosion. Use a scan tool to check for other related codes or communication errors.

Can a weak battery contribute to code U0068?

Yes, a weak or failing battery may cause voltage irregularities, potentially triggering communication bus issues like U0068.

What tools are needed to repair code U0068?

You may need a digital multimeter, an OBDII scan tool, and wiring diagrams to trace and test the affected circuits and connectors.

Should I clear the U0068 code after repairs?

Yes, once repairs are completed, clear the code with a scan tool and monitor the system to ensure the issue is resolved.

Can code U0068 be caused by aftermarket modifications?

Yes, improperly installed aftermarket devices can interfere with the vehicle’s communication bus and cause this code.

Is it safe to drive with code U0068 present?

While it may be possible to drive, it is not recommended as the code can lead to communication errors that affect critical systems, potentially compromising safety.

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