U0177 - Communication Error with Body Control Module in Ford, Chevrolet, and More

Quick Answer

U0177 means: U0177 indicates a communication issue between the Body Control Module and another control unit in the vehicle.

Fix: Check and replace faulty components Cost: $300 - $800 Time: 90-180 minutes

Can I drive with U0177? It's advisable to address this code as soon as possible to prevent further vehicle issues.

Common Questions

What does U0177 mean and how does it affect my car?

U0177 indicates a communication error between the Body Control Module and other control units. This can lead to malfunctioning electrical systems, such as lights or locks, and may impact engine performance if not addressed promptly.

What are the most common causes of U0177 and how much does it cost to fix?

Common causes include a faulty Body Control Module, damaged wiring, and electrical component failures. Repair costs can range from $100 for a software update to $800 for a full BCM replacement, depending on the specific issue.

Can I drive my car with U0177 or should I stop immediately?

While you may be able to drive the vehicle, it is not advisable to ignore the U0177 code as it can lead to safety concerns and further damage. It's best to have it diagnosed and repaired as soon as possible.

How can I diagnose U0177 myself using GeekOBD APP?

Using the GeekOBD APP, you can perform a full OBD2 scan to retrieve the U0177 code, view freeze frame data, and monitor live vehicle parameters to help identify potential issues.

What vehicles are most commonly affected by U0177?

The U0177 code is commonly found in vehicles such as the 2014-2018 Ford F-150 and 2015-2019 Chevrolet Silverado, among others. Always check for manufacturer recalls or Technical Service Bulletins related to your vehicle.

How can I prevent U0177 from happening again?

Regularly inspect your vehicle's wiring and connectors for wear and tear, keep the BCM dry and protected from moisture, and ensure timely software updates as recommended by your vehicle manufacturer.

What is U0177?

The U0177 diagnostic trouble code indicates a communication problem between the vehicle's control modules, specifically with the Body Control Module (BCM). This code is often triggered when the BCM fails to receive data from another control module, such as those responsible for managing various body functions like lighting, door locks, and window operations. Common in vehicles such as the 2014-2018 Ford F-150 and the 2015-2019 Chevrolet Silverado, this code can manifest due to multiple factors, including wiring issues, module failures, or software glitches. The implications can be severe as it can lead to a failure in critical functions like lighting, security systems, and even engine performance, potentially leaving the vehicle inoperable. When this code appears, it’s crucial to address it promptly to prevent further complications and ensure the vehicle's systems operate smoothly. Ignoring a U0177 code can lead to not only inconvenience but also safety risks, as certain features may become non-functional.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U0177 is present:

  • The check engine light remains illuminated on the dashboard, signaling that there's an issue that needs attention.
  • You may experience erratic behavior in electrical systems, such as the headlights flickering or the power windows not functioning correctly.
  • Engine performance issues can arise, such as hesitation during acceleration, which could be linked to the malfunctioning control module.
  • A noticeable decrease in fuel economy might occur, as the vehicle's electronic systems may be trying to compensate for the communication failure.
  • You may find that certain features, like the keyless entry system, are not working, which can be both frustrating and a security concern.

Possible Causes

Most common causes of U0177 (ordered by frequency):

  1. The most common cause of U0177 is a malfunctioning Body Control Module, with a likelihood of about 50%. This can stem from internal failures or software issues within the BCM itself.
  2. Another common culprit is damaged wiring or connector issues, accounting for about 30% of cases. Corrosion, fraying, or loose connections can disrupt communication between modules.
  3. Faulty fuses or relays can also lead to a U0177 code, where about 10% of incidents are linked to electrical components that fail to deliver power to the BCM.
  4. Less common but serious causes include water intrusion in the BCM or other electronic modules, which can lead to extensive electrical damage.
  5. A rare cause might be software bugs that require a firmware update, which can happen in newer vehicles with complex electronic systems.

U0177 Repair Costs

Cost Breakdown by Repair Type

Body Control Module Replacement

Replacing the BCM can resolve communication failures and restore functionality to various systems.

  • Total: $300 - $800
  • Success rate: 85%
Wiring Repair

Repairing damaged wiring or connectors to restore communication between modules.

  • Total: $150 - $300
  • Success rate: 75%
Software Update

Performing a software update on the BCM to fix potential bugs.

  • Total: $100 - $200
  • Success rate: 60%
Money-Saving Tips for U0177
  • 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 U0177 Diagnosis Process

Follow these systematic steps to accurately diagnose U0177. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Begin with an initial visual inspection, checking for any obvious signs of damage like frayed wires, loose connections, or corrosion (5-10 minutes)

Step 1: Begin with an initial visual inspection, checking for any obvious signs of damage like frayed wires, loose connections, or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: Utilize the GeekOBD APP to perform an OBD2 scan, retrieving all trouble codes and freeze frame data to understand the context of the fault (10-15 minutes)

Step 2: Utilize the GeekOBD APP to perform an OBD2 scan, retrieving all trouble codes and freeze frame data to understand the context of the fault (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Conduct component testing using a multimeter to check the voltage and continuity of the affected wiring and connectors (20-30 minutes)

Step 3: Conduct component testing using a multimeter to check the voltage and continuity of the affected wiring and connectors (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: After repairs, perform a system function test to verify the proper operation of the vehicle systems and clear any stored codes (10-15 minutes)

Step 4: After repairs, perform a system function test to verify the proper operation of the vehicle systems and clear any stored codes (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Complete a road test under various driving conditions to confirm that the issue has been resolved and that all systems are functioning normally (15-20 minutes)

Step 5: Complete a road test under various driving conditions to confirm that the issue has been resolved and that all systems are functioning normally (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

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: Ford F-150 BCM Replacement

Vehicle: 2015 Ford F-150, 60,000 miles

Problem: Customer reported malfunctioning lights and a persistent check engine light.

Diagnosis: After running a diagnostic scan, the U0177 code was confirmed. Inspection revealed a faulty BCM.

Solution: Replaced the Body Control Module and performed necessary programming.

Cost: $600 (Parts: $400, Labor: $200)

Result: All lighting issues resolved, and the check engine light no longer illuminated.

Case Study 2: Chevrolet Silverado Wiring Repair

Vehicle: 2017 Chevrolet Silverado, 45,000 miles

Problem: Owner noted intermittent keyless entry failure and dashboard warning lights.

Diagnosis: Diagnostic scan revealed U0177. Visual inspection found corroded wiring near the BCM.

Solution: Repaired the damaged wiring and secured connections.

Cost: $200 (Parts: $50, Labor: $150)

Result: Keyless entry function restored, and warning lights cleared.

Diagnose U0177

Use GeekOBD APP for professional diagnosis!

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  • Professional-grade analysis
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Code Information

Code: U0177
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes