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U0074 2014 Chevrolet Silverado Code - Control Module Communication Powertrain Expansion CAN Bus Off Malfunction

Quick Answer

The U0074 code for a 2014 Chevrolet Silverado indicates a Control Module Communication Powertrain Expansion CAN Bus Off Malfunction. Common causes include Damaged wiring or connectors in the CAN bus system, Faulty control module, Software glitches. 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
U0074 2014 Chevrolet Silverado indicates Control Module Communication Powertrain Expansion CAN Bus Off Malfunction.
Common causes
Common causes include Damaged wiring or connectors in the CAN bus system, Faulty control module, Software glitches.
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 17, 2024
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Code U0074 2014 Chevrolet Silverado Description

The U0074 code for a 2014 Chevrolet Silverado indicates a Control Module Communication Powertrain Expansion CAN Bus Off Malfunction. This means that there is a communication error between the powertrain control module (PCM) and other modules in the vehicle through the Controller Area Network (CAN) bus system. The CAN bus system is responsible for facilitating communication between various control modules in the vehicle, allowing them to share information and coordinate functions.

OBDII Code U0074 2014 Chevrolet Silverado - Control Module Communication Powertrain Expansion CAN Bus Off Malfunction
U0074 2014 Chevrolet Silverado Code - Control Module Communication Powertrain Expansion CAN Bus Off Malfunction

Common Causes of U0074 2014 Chevrolet Silverado

  1. Damaged wiring or connectors in the CAN bus system
  2. Faulty control module
  3. Software glitches
  4. Weak battery
  5. Corrosion or moisture in electrical connections

Symptoms of U0074 2014 Chevrolet Silverado

  1. Engine hesitation or rough idling
  2. Transmission shifting issues
  3. Loss of power
  4. Warning lights illuminated on the dashboard
  5. Difficulty starting the vehicle

How to Fix U0074 2014 Chevrolet Silverado

  1. Diagnose the issue using a diagnostic scanner to retrieve the trouble codes and pinpoint the source of the communication error.
  2. Inspect the wiring and connectors in the CAN bus system for any damage or corrosion. Repair or replace as needed.
  3. Test the control modules for proper function and replace any faulty modules.
  4. Update the software in the affected modules to the latest version to address any glitches.
  5. Ensure the battery is in good condition and properly charged to maintain stable voltage levels for communication between modules.

Cost to Fix U0074 2014 Chevrolet Silverado

The typical repair costs for addressing a U0074 code on a 2014 Chevrolet Silverado can range from $200 to $600, depending on the specific cause of the issue and the extent of repairs needed. This estimate includes parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Rates typically range between $80 and $150 per hour, with variations based on location, vehicle make and model, and engine type.

What does this mean?

Tech Notes for U0074 2014 Chevrolet Silverado

There is a Factory Service Bulletin for the following Chevrolet Models:



- 2014-2018 Chevrolet Silverado

- 2015-2018 Chevrolet Suburban

- 2015-2018 Chevrolet Tahoe



If the Diagnostic Trouble Codes (DTC) P2635, U0074, and/or U18A2 are set, it may be found that the actual fuel pressure (low-pressure system) will be reading substantially higher than desired fuel pressure, in this case, the cause of the problem is a loss of communication between Engine Control Module (ECM) and Fuel Pump Control Module (FPCM).



- Diagnose for any communication DTCs set (U0074 would take priority over U18A2 if both set) before addressing DTC P2635.

- If DTC P2635 is not resolved by correcting the communication DTCs, only then should diagnose the DTC P2635.

- It has been found that a communication issue between the FPCM and ECM can potentially induce DTC P2635 and result in a pressure differential between actual and desired fuel system pressures.

- If the actual fuel pressure is substantially higher than desired (10 psi / 70 kPa or more), replacement of the fuel pump control module or fuel system components typically will not resolve this issue.

- If the actual fuel pressure is substantially lower than desired (10 psi / 70 kPa or more), this Factory Service Bulletin would NOT apply. It would be recommended to diagnose low actual fuel pressure.

Need more information about the U0074 2014 Chevrolet Silverado code?

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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 U0074 2014 Chevrolet Silverado Code

1. What does the OBDII code U0074 mean for a 2014 Chevrolet Silverado?

U0074 indicates a "Control Module Communication Powertrain Expansion CAN Bus Off Malfunction," meaning there's a problem with communication over the Controller Area Network (CAN) bus.

2. What are the common symptoms of the U0074 code on a 2014 Silverado?

Symptoms may include a check engine light, loss of communication with certain modules, erratic or non-functional gauges, and potential drivetrain performance issues.

3. What causes the U0074 code in a Chevy Silverado?

Common causes include wiring issues such as damaged or corroded CAN bus wiring, faulty control modules, a weak battery, or poor electrical connections.

4. Can a weak battery cause the U0074 code?

Yes, a weak or failing battery can lead to insufficient power for module communication, potentially triggering the U0074 code.

5. How do you diagnose the U0074 code on a 2014 Silverado?

Diagnosis involves using a scan tool to check for other related codes, inspecting the CAN bus wiring for damage, ensuring proper electrical connections, and testing the battery and alternator.

6. Can a faulty control module trigger the U0074 code?

Yes, a malfunctioning control module can disrupt CAN bus communication and cause the U0074 code to appear.

7. How do you fix the U0074 code on a 2014 Chevrolet Silverado?

Fixes may include repairing or replacing damaged wiring, cleaning corroded connections, replacing a faulty module, or ensuring the battery and alternator are functioning properly.

8. Is the U0074 code serious, and can I drive with it?

The severity depends on the affected module. While driving may be possible, ignoring the issue could lead to further communication or performance problems.

9. Does clearing the U0074 code with a scan tool fix the problem?

Clearing the code may reset the warning temporarily, but the underlying issue must be resolved to prevent the code from returning.

10. Can a software update fix the U0074 code in a 2014 Silverado?

In some cases, a software update for the affected module may resolve communication issues, but this should be done after verifying no hardware or wiring problems exist.

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