U0157 — Data bus: information centre B – no communication #

The code description may vary depending on the manufacturer. Below are some known variations:

• “Data Bus: Information Centre B – No Communication” (Volvo)
• “Lost Communication With Information Center Module B” (Ford)
• “No Communication With Information Center B” (General Motors/Chevrolet)

Summary of code U0157 #

The U0157 diagnostic trouble code (DTC) indicates that the vehicle’s primary control module, usually the Powertrain Control Module (PCM), cannot communicate with the Information Center B module over the data bus network. The data bus is the vehicle’s internal communication network, allowing control modules to exchange information in real time. When this link is broken, the PCM registers U0157, flagging the absence of communication with this specific module. Such communication issues can create confusion for the driver and impact the functionality of features displayed or managed by the information center. This code is often caused by wiring, network, or module faults and can sometimes be intermittent, making diagnosis a bit of a puzzle.

Frequent symptoms for code U0157 #

When U0157 is present, you may notice several warning signs or changes in how the vehicle operates, especially regarding the dashboard information display and user interface. The symptoms can range from subtle to obvious, depending on how the information center integrates with other systems.

• Information display screen is blank or unresponsive
• Warning lights related to the information center or data bus communication
• Loss of trip/fuel economy data or vehicle settings
• Inoperative dashboard menus or controls
• Other modules may also log communication-related DTCs

Probable causes for code U0157 (by frequency) #

The most common causes of U0157 involve interruptions in the data bus network, physical connection issues, or a fault in the affected module itself. Here’s an ordered list, starting with those most commonly seen in the workshop:

1. Loose, corroded, or damaged wiring/connectors at the information center, PCM, or along the data bus
2. Faulty Information Center B module itself (internal failure)
3. Data bus (CAN/LIN) network circuit issues, such as shorts or open circuits
4. Poor ground or power supply to the information center module
5. Software or firmware issues in one or more modules
6. Aftermarket devices interfering with the network communication

Step-by-step diagnosis for code U0157 #

Diagnosing a communication breakdown like U0157 requires a methodical approach. Think of it like tracing a disconnected wire in a complex web—patience and process pay off. Here’s how a professional technician would proceed:

• Verify the code with a scan tool and check for related communication DTCs in other modules.
• Check vehicle battery voltage and charging system to rule out low voltage concerns.
• Inspect fuses related to the information center and data bus circuits.
• Visually inspect wiring and connectors at the information center module and along the data bus harness for corrosion, damage, or loose pins.
• Perform a wiggle test on harnesses and connectors while monitoring data with a scan tool for communication drops.
• Test CAN/LIN bus resistance with a multimeter to identify shorts or open circuits (typically, CAN bus should read about 60 ohms).
• Check for aftermarket equipment (alarms, remote starters, telematics) that may be spliced into the data network.
• Substitute a known-good information center module, if possible, to confirm module failure.
• Update or reprogram software/firmware in affected modules if recommended by the OEM (Original Equipment Manufacturer).

Possible repairs for code U0157 #

Once the root cause is identified, the repair is often straightforward. Below are the most common fixes, each corresponding to the causes listed above:

• Repair or replace damaged wiring/connectors at the information center or along the data bus
• Replace the faulty Information Center B module
• Repair network circuit issues (fix shorts, open circuits, or poor connections)
• Correct ground or power supply issues (repair grounds, replace fuses, secure connections)
• Install OEM-recommended software/firmware updates
• Remove or properly integrate aftermarket electronic devices that may be interfering with the bus

Can you drive with code U0157? #

It depends on your vehicle’s systems and the severity of the failure, but in most cases, driving is possible, though some information center functions may not be available. Safety-related features typically remain unaffected, but you may lose access to important data such as range, fuel consumption, or warning messages. If multiple communication codes are present or if you notice other electrical issues, limit driving and seek professional diagnosis promptly to avoid further complications.

Vehicles most affected by code U0157 #

This code is most frequently found in modern vehicles using a modular network architecture, especially those with advanced information/entertainment centers. It’s especially common in models from the following manufacturers:

• Volvo (S60, XC60, V70, XC90)
• Ford (Explorer, F-150, Transit)
• General Motors/Chevrolet (Equinox, Silverado, Malibu)
• Chrysler/Dodge/Jeep (Grand Cherokee, RAM 1500)
• Some Toyota and Lexus models with multi-information displays

Common mistakes & best practices for code U0157 #

Misdiagnosis happens when technicians overlook network communication basics or skip steps. Here are some pitfalls and tips to ensure a smooth process:

• Not checking for multiple communication codes, which can indicate a broader network issue
• Assuming the module is faulty without verifying power, ground, and network integrity
• Neglecting visual inspection of connectors and wiring—corrosion and bent pins are easy to miss
• Forgetting to check for aftermarket add-ons spliced into the data bus
• Skipping battery and charging system checks, which can cause intermittent network failures
• Always clear codes and retest after repairs to confirm the fix

Express FAQ for code U0157 #

Still have questions? You’re not alone—here are answers to the most frequent concerns:

• Q: Does U0157 mean my dashboard is about to fail?
  A: Not necessarily. U0157 usually indicates a loss of communication with one module, not the entire dashboard. However, some display functions may be limited or unavailable until the issue is fixed.
• Q: Can a dead battery cause U0157?
  A: Yes, a low or dead battery can trigger communication codes like U0157. Always verify battery health and charging system operation as part of your diagnostic process.