U0074 2017 Chevrolet Silverado Code - Control Module Communication Powertrain Expansion CAN Bus Off Malfunction
Quick Answer
The U0074 diagnostic trouble code (DTC) for a 2017 Chevrolet Silverado indicates a Control Module Communication Powertrain Expansion CAN Bus Off Malfunction. Common causes include Faulty wiring harness connections, Defective control modules, Loose or corroded electrical connections. 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 Faulty wiring harness connections, Defective control modules, Loose or corroded electrical connections.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code U0074 2017 Chevrolet Silverado Description
The U0074 diagnostic trouble code (DTC) for a 2017 Chevrolet Silverado indicates a Control Module Communication Powertrain Expansion CAN Bus Off Malfunction. This code specifically points to a communication error between the powertrain control module (PCM) and other control modules on the Controller Area Network (CAN) bus. The CAN bus is a network that allows various modules in the vehicle to communicate with each other. When this communication is disrupted or lost, it can lead to performance issues and potential long-term effects on the vehicle's systems.
Common Causes of U0074 2017 Chevrolet Silverado
- Faulty wiring harness connections
- Defective control modules
- Loose or corroded electrical connections
- Software glitches in the PCM or other modules
- Physical damage to the CAN bus network
Symptoms of U0074 2017 Chevrolet Silverado
- Check Engine Light illuminated on the dashboard
- Engine running rough or misfiring
- Transmission shifting erratically
- Reduced fuel efficiency
- Vehicle stalling or difficulty starting
How to Fix U0074 2017 Chevrolet Silverado
- Begin by conducting a thorough visual inspection of the wiring harness and connections to identify any visible damage or loose connections.
- Use a diagnostic scan tool to retrieve the specific trouble codes and pinpoint the exact source of the communication error.
- Test the control modules on the CAN bus to determine if any are malfunctioning and need replacement.
- Check for software updates or reprogramming that may be available from the manufacturer to address any glitches in the PCM or other modules.
- Repair or replace any damaged wiring harnesses, control modules, or connections as needed to restore proper communication on the CAN bus.
Cost to Fix U0074 2017 Chevrolet Silverado
The typical repair costs for addressing a U0074 code on a 2017 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, parts and labor for this type of repair could range from $200 to $800 or more. It's important to note that diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. While most auto repair shops charge between $80 and $150 per hour, rates may be higher at dealerships or in metropolitan areas, while independent shops may offer lower prices. For a more accurate estimate, it's recommended to obtain quotes from local auto repair shops.
Tech Notes for U0074 2017 Chevrolet Silverado
- 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 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.