Engine-Codes.com
Engine-Codes – GMC – U0074 2017 GMC Sierra

U0074 2017 GMC Sierra Code - Control Module Communication Powertrain Expansion CAN Bus Off Malfunction

Quick Answer

The U0074 code for a 2017 GMC Sierra indicates a Control Module Communication Powertrain Expansion CAN Bus Off Malfunction. Common causes include Faulty control module, Damaged wiring or connectors in the CAN bus network, Software glitches or programming errors. 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 2017 GMC Sierra indicates Control Module Communication Powertrain Expansion CAN Bus Off Malfunction.
Common causes
Common causes include Faulty control module, Damaged wiring or connectors in the CAN bus network, Software glitches or programming errors.
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 19, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code U0074 2017 GMC Sierra Description

The U0074 code for a 2017 GMC Sierra indicates a Control Module Communication Powertrain Expansion CAN Bus Off Malfunction. This means that there is a communication error within the vehicle's powertrain control module (PCM) network, specifically on the Controller Area Network (CAN) bus that connects various control modules in the vehicle. The CAN bus is essential for transmitting data between different modules to ensure proper operation and coordination of various systems in the vehicle.

OBDII Code U0074 2017 GMC Sierra - Control Module Communication Powertrain Expansion CAN Bus Off Malfunction
U0074 2017 GMC Sierra Code - Control Module Communication Powertrain Expansion CAN Bus Off Malfunction

Common Causes of U0074 2017 GMC Sierra

  1. Faulty control module
  2. Damaged wiring or connectors in the CAN bus network
  3. Software glitches or programming errors
  4. Issues with the PCM
  5. Electrical interference or shorts in the system

Symptoms of U0074 2017 GMC Sierra

  1. Check Engine Light illuminated
  2. Engine misfires or rough idling
  3. Transmission shifting issues
  4. Loss of power or acceleration
  5. Vehicle stalling or difficulty starting

How to Fix U0074 2017 GMC Sierra

  1. Perform a thorough diagnostic scan to retrieve the specific trouble codes and pinpoint the source of the communication malfunction.
  2. Inspect the wiring and connectors in the CAN bus network for any damage or corrosion, repairing or replacing as needed.
  3. Check for any software updates or reprogramming that may be required for the control modules involved in the communication error.
  4. Test the control modules and PCM for proper functionality, replacing any faulty components.
  5. Clear the trouble codes, reset the system, and perform a test drive to ensure the issue has been resolved.

Cost to Fix U0074 2017 GMC Sierra

The typical repair costs for addressing a U0074 code in a 2017 GMC Sierra can range from $200 to $600, depending on the specific cause of the communication malfunction and the extent of repairs needed. This estimate includes parts and labor, but actual costs may vary based on the location of the repair shop, the make and model of the vehicle, and the hourly labor rates. It's advisable to consult with a trusted mechanic or dealership for a more accurate cost estimate tailored to your specific situation.

What does this mean?

Tech Notes for U0074 2017 GMC Sierra

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 2017 GMC Sierra code?

Need more information on how to fix the U0074 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0074 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2017 GMC Sierra Code

1. What does the OBDII code U0074 mean on a 2017 GMC Sierra?

U0074 indicates a "Control Module Communication Powertrain Expansion CAN Bus Off Malfunction," meaning there’s a communication issue in the CAN (Controller Area Network) bus system.

2. What are the common symptoms of code U0074 on a 2017 GMC Sierra?

Symptoms may include warning lights like the check engine light or service traction control, loss of powertrain functionality, or intermittent electrical issues.

3. What causes the U0074 code to appear on a GMC Sierra?

Common causes include damaged or corroded CAN bus wiring, faulty connectors, a failing control module, or a short circuit in the communication network.

4. Can driving with code U0074 damage my 2017 GMC Sierra?

Driving with U0074 may result in impaired performance or safety systems, so it’s best to address the issue promptly to avoid further damage.

5. How do I diagnose the U0074 code on my GMC Sierra?

Start by inspecting the CAN bus wiring and connectors for damage or corrosion, check for other related codes, and test the affected modules using a diagnostic scanner.

6. How can I fix the U0074 code on my 2017 GMC Sierra?

Repairs may include cleaning or replacing corroded connectors, fixing damaged wiring, or replacing a faulty control module causing the communication issue.

7. What tools are needed to troubleshoot the U0074 code?

You’ll need an OBDII scanner with CAN diagnostic capabilities, a multimeter to check continuity, and a wiring diagram for the vehicle.

8. Can a dead battery cause code U0074 on a GMC Sierra?

Yes, a weak or dead battery can disrupt the CAN bus communication and trigger the U0074 code.

9. How much does it cost to fix the U0074 code on a 2017 GMC Sierra?

Repair costs vary but can range from $100 for minor wiring repairs to $1,000 or more if a control module needs replacement.

10. Is clearing the U0074 code enough to fix the problem?

Clearing the code without addressing the root cause may result in the code returning, so it’s essential to repair the underlying issue first.

Discuss the causes and fixes for U0074 2017 GMC Sierra OBDII Code

Submit a New Comment

Code U0074 2017 GMC Sierra comments

No comments found for this page.