U0074 2016 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 2016 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 2016 Chevrolet Silverado Description
What are the Possible Causes of the DTC U0074 2016 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 2016 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 2016 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.
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Frequently Asked Questions about U0074 2016 Chevrolet Silverado Code
1. What does the OBDII code U0074 mean on a 2016 Chevrolet Silverado?
U0074 indicates a "Control Module Communication Powertrain Expansion CAN Bus Off Malfunction," meaning a communication issue in the Controller Area Network (CAN) bus system.
2. What are common symptoms of code U0074 in a 2016 Chevrolet Silverado?
Symptoms may include the Check Engine Light or other warning lights turning on, issues with transmission shifting, loss of communication between modules, or erratic vehicle performance.
3. What causes the U0074 code to appear in a 2016 Chevrolet Silverado?
Common causes include damaged wiring or connectors in the CAN bus system, a failed control module, a short circuit, or low battery voltage.
4. Can a weak battery trigger the U0074 code in a 2016 Chevrolet Silverado?
Yes, low or unstable battery voltage can cause communication errors and trigger the U0074 code.
5. How can I diagnose the U0074 code on my 2016 Chevrolet Silverado?
Start by inspecting the CAN bus wiring and connectors for damage or corrosion, check for other related codes, and test the battery voltage and ground connections.
6. Is it safe to drive a 2016 Chevrolet Silverado with the U0074 code?
Driving with the U0074 code may be unsafe as it can cause unpredictable performance issues or disable critical systems. It’s best to address the issue promptly.
7. How much does it cost to fix the U0074 code on a 2016 Chevrolet Silverado?
Repair costs vary, depending on the issue. Simple fixes like repairing damaged wiring might cost $100–$300, while replacing a control module could exceed $500.
8. Can I fix the U0074 code on my 2016 Chevrolet Silverado myself?
If you’re skilled with automotive diagnostics, you can inspect and repair damaged wiring or connectors. For complex issues like module replacement, professional help may be required.
9. Does the U0074 code require reprogramming any modules?
If a control module needs replacement, it may require reprogramming to ensure proper communication and functionality within the vehicle’s CAN bus system.
10. Can a faulty ground connection cause the U0074 code?
Yes, poor or loose ground connections can disrupt communication in the CAN bus system and trigger the U0074 code.
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