Quick Answer
U0374 means: U0374 indicates a communication error between vehicle modules.
Can I drive with U0374? Immediate attention is recommended to prevent further issues.
Common Questions
What does U0374 mean and how does it affect my car?
DTC U0374 signifies a communication error between the body control module and other vehicle systems. This can lead to various electronic features malfunctioning, such as power windows and stability control systems, affecting your vehicle's safety and convenience.
What are the most common causes of U0374 and how much does it cost to fix?
The most common causes include a faulty body control module (BCM) and wiring issues. Repair costs can range from $150 for wiring repairs to $800 for BCM replacement, depending on the repair needed.
Can I drive my car with U0374 or should I stop immediately?
While you may still drive your vehicle, it's advisable to address the U0374 code as soon as possible. Ignoring it can lead to more severe electronic failures and may compromise your safety.
How can I diagnose U0374 myself using GeekOBD APP?
You can use the GeekOBD APP to scan your vehicle for trouble codes. Pay close attention to the U0374 code and any related codes that appear, as they can provide context for the issue.
What vehicles are most commonly affected by U0374?
DTC U0374 is frequently seen in 2015-2018 Chevrolet Silverado and GMC Sierra models. It's important to check for any recalls or technical service bulletins (TSBs) related to this issue.
How can I prevent U0374 from happening again?
Regular vehicle maintenance, including inspecting wiring and connections, can help prevent U0374. Additionally, keeping your vehicle's software updated can mitigate potential glitches.
What is U0374?
DTC U0374 is a diagnostic trouble code that indicates a communication issue between the vehicle's modules, specifically pointing to an invalid data received from the body control module (BCM) or a related module. This code commonly appears in vehicles manufactured by General Motors, especially in models like the 2015-2018 Chevrolet Silverado and GMC Sierra. When this trouble code is triggered, it suggests that the vehicle's onboard diagnostic system has detected a discrepancy in the communication signals exchanged between various electronic control units (ECUs). The implications of this code can range from minor inconvenience to serious safety concerns. Drivers may experience issues with various electronic features, such as power windows, headlights, or even stability control, which rely on clear communication between modules. Ignoring this code can lead to further complications, such as complete module failure or erratic vehicle behavior. Therefore, addressing DTC U0374 promptly is essential for maintaining optimal vehicle performance and safety.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0374 is present:
- Check engine light stays on constantly, indicating an ongoing issue with vehicle communication.
- Power windows and door locks may become unresponsive, affecting driver convenience and safety.
- Engine performance might be erratic, with stalling or hesitation during acceleration.
- Inconsistent dashboard readings, such as incorrect fuel level or temperature gauge fluctuations.
- Inability to utilize advanced safety features like stability control or traction control when they malfunction.
Possible Causes
Most common causes of U0374 (ordered by frequency):
- Faulty body control module (BCM) - Most common cause (60% likelihood). The BCM is responsible for managing various electronic systems and can fail due to age or electrical issues.
- Wiring issues - Second most common cause (25% likelihood). Damaged or corroded wiring can disrupt communication between modules. This can often be identified during a visual inspection.
- Poor connections - Third cause (10% likelihood). Loose or corroded connectors can lead to intermittent communication failures. Regular maintenance can help prevent this.
- Less common but serious cause: Faulty engine control module (ECM). If the ECM malfunctions, it may not correctly interpret signals, leading to various operational issues.
- Rare but possible cause: Software glitches in the vehicle's modules. These can sometimes be resolved through software updates by a dealer.
U0374 Repair Costs
Cost Breakdown by Repair Type
BCM Replacement
Replacing the faulty body control module with a new or refurbished unit.
- Total: $400 - $800
- Success rate: 90%
Wiring Repair
Repairing damaged wiring or connections that may cause communication failures.
- Total: $150 - $300
- Success rate: 85%
Money-Saving Tips for U0374
- Start with the most common and least expensive repairs first
- Use GeekOBD APP to confirm diagnosis before replacing expensive parts
- Consider preventive maintenance to avoid future occurrences
- Compare prices for OEM vs aftermarket parts based on your needs
- Address the issue promptly to prevent more expensive secondary damage
Diagnostic Steps
Professional U0374 Diagnosis Process
Follow these systematic steps to accurately diagnose U0374. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Perform an initial visual inspection for damaged wiring, loose connections, or signs of corrosion (5-10 minutes)
Step 1: Perform an initial visual inspection for damaged wiring, loose connections, or signs of corrosion (5-10 minutes).
Step 2: Step 2: Use the GeekOBD APP to perform an OBD2 scan, retrieving all codes and freeze frame data to understand the fault context (10-15 minutes)
Step 2: Use the GeekOBD APP to perform an OBD2 scan, retrieving all codes and freeze frame data to understand the fault context (10-15 minutes).
Step 3: Step 3: Conduct component testing using a multimeter or specific diagnostic tools to test suspected components, focusing on the BCM and connections (20-30 minutes)
Step 3: Conduct component testing using a multimeter or specific diagnostic tools to test suspected components, focusing on the BCM and connections (20-30 minutes).
Step 4: Step 4: After repairs, perform a system function test to verify proper operation and clear all codes (10-15 minutes)
Step 4: After repairs, perform a system function test to verify proper operation and clear all codes (10-15 minutes).
Step 5: Step 5: Finally, conduct a road test to ensure the vehicle operates correctly under various conditions and to confirm repair success (15-20 minutes)
Step 5: Finally, conduct a road test to ensure the vehicle operates correctly under various conditions and to confirm repair success (15-20 minutes).
Important Notes
- Always verify the repair with GeekOBD APP after completing diagnostic steps
- Clear codes and test drive to ensure the problem is resolved
- Address underlying causes to prevent code recurrence
Real Repair Case Studies
Case Study 1: BCM Replacement in 2017 Chevrolet Silverado
Vehicle: 2017 Chevrolet Silverado 1500, 45,000 miles
Problem: Customer reported intermittent power window function and dashboard warning lights.
Diagnosis: OBD2 scan revealed U0374 along with other codes indicating BCM issues. Visual inspection showed corrosion on BCM connectors.
Solution: Replaced the body control module and cleaned all connections.
Cost: $600 (parts: $400 for BCM, $200 for labor)
Result: All functions restored, and no further issues reported during follow-up.
Case Study 2: Wiring Repair in 2016 GMC Sierra
Vehicle: 2016 GMC Sierra 1500, 50,000 miles
Problem: Driver experienced failure of several electronic systems, including headlights and door locks.
Diagnosis: DTC U0374 was logged. Wiring inspection revealed damaged insulation on several wires near the BCM.
Solution: Repaired wiring and reconnected all affected modules.
Cost: $250 (parts: $50 for connectors, $200 for labor)
Result: All systems functioned correctly after repairs, and customer reported satisfaction.