U0074 2017 Chevrolet Silverado Code - Control Module Communication Powertrain Expansion CAN Bus Off Malfunction
Quick Answer
The devices connected to the chassis high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. 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
- U0074 2017 Chevrolet Silverado indicates Control Module Communication Powertrain Expansion CAN Bus Off Malfunction.
- 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.
Code U0074 2017 Chevrolet Silverado Description
What are the Possible Causes of the DTC U0074 2017 Chevrolet Silverado?
- 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 U0074 2017 Chevrolet Silverado?
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.
Code Tech Notes
- 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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the U0074 2017 Chevrolet Silverado 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 U0074 2017 Chevrolet Silverado code?
Need more information on how to fix the U0074 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the U0074 2017 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about U0074 2017 Chevrolet Silverado Code
1. What does the OBDII code U0074 mean on a 2017 Chevrolet Silverado?
U0074 indicates a "Control Module Communication Powertrain Expansion CAN Bus Off Malfunction," meaning there is an issue with the communication network linking various modules in the vehicle.
2. What are the common symptoms of the U0074 code in a 2017 Chevrolet Silverado?
Symptoms include a check engine light, loss of communication with certain modules, transmission shifting issues, or failure of certain electronic systems.
3. What causes the U0074 code to appear on a 2017 Chevrolet Silverado?
Common causes include a faulty control module, damaged or corroded wiring in the CAN bus system, loose connectors, or a short circuit in the communication network.
4. How can I diagnose the U0074 code on my 2017 Chevrolet Silverado?
Start by scanning the vehicle with an OBDII scanner to confirm the code, inspect the CAN bus wiring and connectors for damage, and test the affected control modules for faults.
5. Can a dead battery cause the U0074 code in a 2017 Chevrolet Silverado?
Yes, a weak or dead battery can cause voltage irregularities, potentially leading to CAN bus communication errors like U0074.
6. Is it safe to drive a 2017 Chevrolet Silverado with a U0074 code?
It may be unsafe, depending on the severity of the communication issue, as critical systems like transmission and braking may be affected.
7. How much does it cost to fix a U0074 code on a 2017 Chevrolet Silverado?
Repair costs can range from $100 to over $1,000, depending on whether the issue is a simple wiring repair or requires replacing a control module.
8. Can I clear the U0074 code without fixing the problem?
You can clear the code with an OBDII scanner, but it will likely return if the underlying issue isn’t addressed.
9. What tools are needed to troubleshoot the U0074 code on a 2017 Chevrolet Silverado?
You'll need an OBDII scanner, a multimeter to test wiring and connectors, and potentially a wiring diagram for the CAN bus system.
10. Can a software update fix the U0074 code in a 2017 Chevrolet Silverado?
In some cases, a software update from a dealership may resolve the issue if it’s caused by a programming glitch in one of the control modules.
Discuss the causes and fixes for U0074 2017 Chevrolet Silverado OBDII Code
Code U0074 2017 Chevrolet Silverado comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
