U0074 2015 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 2015 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 2015 Chevrolet Silverado Description
What are the Possible Causes of the DTC U0074 2015 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 2015 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 2015 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 2015 Chevrolet Silverado Code
1. What does the OBDII code U0074 mean on a 2015 Chevrolet Silverado?
The code U0074 indicates a "Control Module Communication Powertrain Expansion CAN Bus Off Malfunction," meaning there's an issue with communication between control modules via the CAN (Controller Area Network) bus.
2. What are the common symptoms of the U0074 code in a 2015 Silverado?
Symptoms may include the check engine light turning on, other warning lights illuminating, unresponsive vehicle systems, and potential issues with starting or driving performance.
3. What causes the U0074 code to appear in a 2015 Chevrolet Silverado?
Possible causes include a short or open circuit in the CAN bus wiring, a faulty control module, poor connections at wiring harnesses, or a low battery voltage.
4. Can a weak battery cause the U0074 code in a 2015 Silverado?
Yes, a weak or failing battery can cause communication issues on the CAN bus, potentially triggering the U0074 code.
5. How can I diagnose the U0074 code on my Silverado?
Start by checking the battery voltage, inspecting CAN bus wiring and connectors for damage or corrosion, and using a scan tool to monitor module communication and pinpoint the issue.
6. Is it safe to drive with the U0074 code on my 2015 Silverado?
It’s not recommended, as the code can indicate critical communication problems between modules, which might lead to unpredictable vehicle performance or safety system malfunctions.
7. How do I fix the U0074 code on my 2015 Chevrolet Silverado?
Fixes may include repairing or replacing damaged CAN bus wiring, ensuring proper connections at harnesses, reprogramming or replacing faulty control modules, or addressing low battery voltage.
8. Can a faulty ECU or module trigger the U0074 code in a Silverado?
Yes, a malfunctioning control module, such as the powertrain control module (PCM), can cause communication errors leading to the U0074 code.
9. What tools are needed to troubleshoot the U0074 code in a 2015 Silverado?
You’ll need a multimeter to check wiring, a scan tool capable of reading CAN bus data, and possibly an oscilloscope for advanced diagnostics.
10. Does clearing the U0074 code fix the issue in a 2015 Silverado?
Clearing the code may turn off the check engine light temporarily, but the underlying issue must be addressed to prevent the code from returning.
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