U0074 2017 GMC Sierra 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 GMC Sierra 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 GMC Sierra Description
What are the Possible Causes of the DTC U0074 2017 GMC Sierra?
- 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 GMC Sierra?
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 GMC Sierra 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.
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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.
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