U0074 2016 GMC Sierra Code - Control Module Communication Powertrain Expansion CAN Bus Off Malfunction
Quick Answer
The U0074 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a Control Module Communication Powertrain Expansion CAN Bus Off Malfunction. Common causes include Faulty powertrain control module (PCM), Loose or corroded wiring connections in the CAN bus system, Defective CAN bus 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 GMC Sierra indicates Control Module Communication Powertrain Expansion CAN Bus Off Malfunction.
- Common causes
- Common causes include Faulty powertrain control module (PCM), Loose or corroded wiring connections in the CAN bus system, Defective CAN bus 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.
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Code U0074 2016 GMC Sierra Description
The U0074 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a Control Module Communication Powertrain Expansion CAN Bus Off Malfunction. This code specifically points to a communication issue within the vehicle's powertrain control module (PCM) and the expansion controller area network (CAN) bus. The CAN bus is a network that allows various control modules in the vehicle to communicate with each other. When this communication is disrupted or lost, it can lead to a range of performance issues and potentially affect the overall functionality of the vehicle.
Common Causes of U0074 2016 GMC Sierra
- Faulty powertrain control module (PCM)
- Loose or corroded wiring connections in the CAN bus system
- Defective CAN bus module
- Software issues in the PCM or CAN bus system
- Water damage or exposure to moisture affecting the communication system
Symptoms of U0074 2016 GMC Sierra
- Check engine light illuminated
- Engine misfires or rough idling
- Transmission shifting issues
- Vehicle stalling or difficulty starting
- Reduced fuel efficiency
How to Fix U0074 2016 GMC Sierra
- Begin by conducting a thorough inspection of the wiring connections in the CAN bus system and the PCM. Look for any loose or corroded connections and repair or replace them as needed.
- Check the powertrain control module for any signs of damage or malfunction. If necessary, replace the PCM with a new unit.
- Inspect the CAN bus module for faults or defects. Replace the module if it is found to be faulty.
- Perform a software update or reprogramming of the PCM to ensure that it is functioning correctly and communicating with the CAN bus system.
- Clear the diagnostic trouble codes from the vehicle's system and test drive the vehicle to ensure that the issue has been resolved.
Cost to Fix U0074 2016 GMC Sierra
The typical repair costs for addressing a U0074 code in a 2016 GMC Sierra can vary depending on the specific cause of the issue. On average, the parts required for this repair, such as a new PCM or CAN bus module, can range from $200 to $800. Labor costs at auto repair shops typically fall between $80 and $150 per hour, with the total repair time varying based on the complexity of the repair. Therefore, the total cost for resolving this issue may range from $300 to $1200 or more. It is advisable to consult with a qualified mechanic or dealership to obtain a more accurate estimate based on the specific circumstances of the vehicle.
Tech Notes for U0074 2016 GMC Sierra
- 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.
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Frequently Asked Questions about U0074 2016 GMC Sierra Code
1. What does the OBDII code U0074 mean on a 2016 GMC Sierra?
U0074 indicates a "Control Module Communication Powertrain Expansion CAN Bus Off Malfunction," meaning there is an issue with the communication network between control modules.
2. What are the common symptoms of the U0074 code on a 2016 GMC Sierra?
Symptoms may include the check engine light turning on, issues with drivetrain performance, unresponsive or erratic vehicle systems, or a failure to start.
3. What causes the U0074 code to appear on a 2016 GMC Sierra?
Common causes include a faulty control module, damaged CAN bus wiring, poor electrical connections, or a malfunctioning CAN bus communication system.
4. Can a weak battery cause the U0074 code on a 2016 GMC Sierra?
Yes, a weak or failing battery can cause voltage issues that disrupt CAN bus communication, triggering the U0074 code.
5. How do you diagnose the U0074 code on a 2016 GMC Sierra?
Diagnosing this code involves checking for loose or damaged wiring, testing the CAN bus network for continuity, inspecting module connectors, and using a scan tool to monitor communication signals.
6. How serious is the U0074 code on a 2016 GMC Sierra?
The U0074 code is moderately serious, as it can cause drivability issues and may lead to further damage if not addressed promptly.
7. What repairs can fix the U0074 code on a 2016 GMC Sierra?
Repairs may include fixing or replacing damaged wiring, reconnecting loose connectors, reprogramming or replacing a faulty control module, or addressing power supply issues.
8. Can I drive my 2016 GMC Sierra with the U0074 code?
Driving with the U0074 code is not recommended, as it can cause erratic behavior or lead to a breakdown if the communication system fails completely.
9. How much does it cost to fix the U0074 code on a 2016 GMC Sierra?
Repair costs vary, but diagnosing and fixing wiring or connector issues may cost $100–$300, while replacing a control module could range from $500–$1,200 or more.
10. Can clearing the U0074 code solve the problem on a 2016 GMC Sierra?
Clearing the code may provide temporary relief but won't fix the underlying issue. Proper diagnosis and repair are necessary to prevent the code from returning.
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