U0074 2018 Chevrolet Silverado Code - Control Module Communication Powertrain Expansion CAN Bus Off Malfunction
Quick Answer
The U0074 code for a 2018 Chevrolet Silverado indicates a Control Module Communication Powertrain Expansion CAN Bus Off Malfunction. Common causes include Damaged wiring or connectors in the CAN bus system, Faulty powertrain control module (PCM), Issues with other control modules. 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 2018 Chevrolet Silverado indicates Control Module Communication Powertrain Expansion CAN Bus Off Malfunction.
- Common causes
- Common causes include Damaged wiring or connectors in the CAN bus system, Faulty powertrain control module (PCM), Issues with other control modules.
- 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 2018 Chevrolet Silverado Description
The U0074 code for a 2018 Chevrolet Silverado indicates a Control Module Communication Powertrain Expansion CAN Bus Off Malfunction. This means that there is a communication issue between the powertrain control module (PCM) and other control modules in the vehicle through the Controller Area Network (CAN) bus system. The CAN bus system is responsible for transmitting data between various modules in the vehicle, allowing them to communicate and work together effectively.
Common Causes of U0074 2018 Chevrolet Silverado
- Damaged wiring or connectors in the CAN bus system
- Faulty powertrain control module (PCM)
- Issues with other control modules
- Software glitches
- Electrical interference or shorts
Symptoms of U0074 2018 Chevrolet Silverado
- Rough idling
- Stalling
- Poor acceleration
- Dashboard warning lights illuminated
- Vehicle not starting
How to Fix U0074 2018 Chevrolet Silverado
- Perform a thorough diagnosis using a scan tool to identify the specific module or wiring causing the communication issue.
- Inspect the CAN bus system for damaged wiring, connectors, or corrosion. Repair or replace as needed.
- Test the powertrain control module (PCM) and other control modules for proper functionality. Replace any faulty modules.
- Clear the diagnostic trouble codes and retest the vehicle to ensure the issue has been resolved.
- If necessary, update the software in the affected modules to prevent future communication errors.
Cost to Fix U0074 2018 Chevrolet Silverado
The typical repair costs for addressing a U0074 code on a 2018 Chevrolet Silverado can range from $200 to $500, including parts and labor. However, it's important to note that the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops commonly charge between $80 and $150 per hour for labor. Rates may be higher in metropolitan areas or at dealerships, while independent shops often charge less. It's recommended to obtain local estimates for a more accurate cost assessment.
Tech Notes for U0074 2018 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.
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Frequently Asked Questions about U0074 2018 Chevrolet Silverado Code
1. What does the OBDII code U0074 mean on a 2018 Chevrolet Silverado?
The code U0074 indicates a "Control Module Communication Powertrain Expansion CAN Bus Off Malfunction," meaning there is a communication issue on the CAN (Controller Area Network) bus.
2. What are the common symptoms of code U0074 in a 2018 Chevrolet Silverado?
Common symptoms include warning lights on the dashboard, loss of communication with certain control modules, erratic vehicle behavior, or failure to start.
3. What causes the U0074 code in a 2018 Chevrolet Silverado?
Possible causes include damaged or corroded wiring in the CAN bus system, a faulty control module, a short circuit, or power/ground issues.
4. Can a low battery cause the U0074 code in my Silverado?
Yes, a low or weak battery can cause communication issues on the CAN bus, potentially triggering the U0074 code.
5. How do I diagnose the U0074 code on a 2018 Chevrolet Silverado?
Diagnose the code by inspecting the CAN bus wiring and connectors for damage, checking the battery voltage, and using a scan tool to locate specific module communication issues.
6. Can I drive my 2018 Chevrolet Silverado with the U0074 code?
Driving with this code is not recommended, as it may lead to unpredictable vehicle behavior or failure of critical systems.
7. How do I fix the U0074 code on my Silverado?
Repairs may include replacing damaged wiring or connectors, resetting the modules with a scan tool, or replacing a faulty control module if necessary.
8. How much does it cost to fix the U0074 code on a 2018 Chevrolet Silverado?
Repair costs vary depending on the cause, but they can range from $100 for simple wiring repairs to $500 or more if a module needs replacement.
9. Can a faulty ground connection cause the U0074 code?
Yes, a poor or loose ground connection can disrupt communication on the CAN bus, leading to the U0074 code.
10. Do I need a professional to fix the U0074 code in my Silverado?
While basic checks like inspecting wiring can be done at home, diagnosing and repairing CAN bus issues often require specialized tools and expertise, so professional assistance may be necessary.
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