Quick Answer
U0157 means: DTC U0157 signifies a communication failure between the ECM and BCM.
Can I drive with U0157? Immediate attention is recommended to avoid further electrical issues.
Common Questions
What does U0157 mean and how does it affect my car?
DTC U0157 means that your vehicle's Engine Control Module has lost communication with the Body Control Module. This can lead to multiple electrical malfunctions, affecting everything from your lights to door locks. If left unresolved, it could lead to greater issues down the line.
What are the most common causes of U0157 and how much does it cost to fix?
Common causes include faulty wiring, a malfunctioning BCM, or poor battery connections. Repair costs can range from $100 for simple wiring fixes up to $800 for BCM replacement, depending on the severity of the issue.
Can I drive my car with U0157 or should I stop immediately?
While it may be possible to drive a short distance, it is not advisable due to potential electrical failures and safety risks. It's best to address this issue promptly to avoid being stranded or causing further damage.
How can I diagnose U0157 myself using GeekOBD APP?
You can use the GeekOBD APP to scan your vehicle for codes, check freeze frame data, and monitor live data streams. Look for any abnormalities in the BCM and ECM communication to narrow down the issue.
What vehicles are most commonly affected by U0157?
Models such as the 2015-2018 Ford F-150 and the 2010-2017 Chevrolet Malibu frequently experience DTC U0157 due to their BCM designs. Check for any recalls or Technical Service Bulletins (TSBs) related to electrical issues in these vehicles.
How can I prevent U0157 from happening again?
Regular maintenance, including checking battery connections and inspecting wiring harnesses for wear and corrosion, can help prevent future issues. Consider using the GeekOBD APP for periodic diagnostics to catch potential issues early.
What is U0157?
DTC U0157 indicates that the vehicle's Engine Control Module (ECM) has lost communication with the Body Control Module (BCM). This can happen in various vehicles, particularly in models from manufacturers like Ford, Chevrolet, and GMC from 2010 to 2018. The BCM is responsible for controlling various electrical systems in your vehicle, including lighting, door locks, and security systems. When the ECM cannot communicate with the BCM, it may trigger warning lights on the dashboard, affect the functionality of your vehicle’s electrical systems, and potentially lead to safety issues. In real-world terms, if you experience this code, you might notice that your vehicle's lights are malfunctioning, or certain electronic features may not work as intended. Ignoring this code can result in further electrical issues and even leave your vehicle inoperable. Therefore, understanding and addressing DTC U0157 promptly is crucial to maintaining your vehicle's reliability and safety on the road.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0157 is present:
- The check engine light or other warning lights on the dashboard may stay illuminated, indicating a communication issue between modules.
- You may experience electrical malfunctions, such as power windows or door locks failing to operate, which can affect your daily use of the vehicle.
- In some cases, the engine may hesitate or stall unexpectedly due to compromised vehicle control systems.
- You might notice that your vehicle's security system behaves erratically, such as false alarms or unresponsive key fob functions.
- Fuel economy could decrease significantly as a result of the BCM affecting engine performance and efficiency.
Possible Causes
Most common causes of U0157 (ordered by frequency):
- The most common cause of DTC U0157 is a faulty wiring connection or damaged harness, with a likelihood of approximately 60%. Corrosion or wear can disrupt communication.
- Another significant cause is a malfunctioning Body Control Module itself, which may be due to internal component failure or software issues, occurring in about 25% of cases.
- Poor battery connections or low battery voltage can also result in communication errors, so ensuring your battery is in good condition is essential. This is a common oversight among vehicle owners.
- Less common but serious causes include water intrusion in the BCM area, which can damage the module and other electrical components, requiring immediate inspection.
- A rare cause might be issues within the Engine Control Module, affecting its ability to send or receive data properly from the BCM.
U0157 Repair Costs
Cost Breakdown by Repair Type
Wiring Repair
Repairing or replacing damaged wiring or connectors in the communication circuit.
- Total: $100 - $300
- Success rate: 85%
BCM Replacement
Replacing a faulty Body Control Module with a new or refurbished unit.
- Total: $300 - $800
- Success rate: 90%
ECM Reprogramming
Reprogramming the Engine Control Module to restore communication with the BCM.
- Total: $150 - $400
- Success rate: 75%
Money-Saving Tips for U0157
- 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 U0157 Diagnosis Process
Follow these systematic steps to accurately diagnose U0157. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion, which can be done in about 5-10 minutes
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion, which can be done in about 5-10 minutes.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Use the GeekOBD APP to retrieve all codes and freeze frame data to understand the fault context, taking around 10-15 minutes
Step 2: OBD2 scan with GeekOBD APP - Use the GeekOBD APP to retrieve all codes and freeze frame data to understand the fault context, taking around 10-15 minutes.
Step 3: Step 3: Component testing - Utilize a multimeter or specific diagnostic tools to test suspected components, which can take 20-30 minutes depending on findings
Step 3: Component testing - Utilize a multimeter or specific diagnostic tools to test suspected components, which can take 20-30 minutes depending on findings.
Step 4: Step 4: System function test - After any repairs, verify proper operation and clear codes using the GeekOBD APP to ensure everything is functioning as it should, which will take about 10-15 minutes
Step 4: System function test - After any repairs, verify proper operation and clear codes using the GeekOBD APP to ensure everything is functioning as it should, which will take about 10-15 minutes.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure no further issues arise, taking 15-20 minutes
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure no further issues arise, taking 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: Repair of U0157 in a 2016 Ford F-150
Vehicle: 2016 Ford F-150, 45,000 miles
Problem: Customer reported multiple electrical issues, including non-functioning lights and door locks.
Diagnosis: After scanning with the GeekOBD APP, DTC U0157 was confirmed. Visual inspection revealed corroded connectors.
Solution: Replaced damaged connectors and repaired wiring harness, clearing the code.
Cost: $250 for parts and labor.
Result: All electrical features returned to normal operation, and no further issues were reported.
Case Study 2: BCM Replacement for U0157 in a 2015 Chevrolet Malibu
Vehicle: 2015 Chevrolet Malibu, 60,000 miles
Problem: Customer experienced frequent stalling and dashboard warning lights.
Diagnosis: Scanning revealed U0157; further tests indicated a faulty BCM.
Solution: Replaced BCM and reprogrammed the module using dealership software.
Cost: $600 including parts and labor.
Result: Vehicle performed flawlessly post-repair with no recurrence of issues.