Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is having trouble talking to another part of the car. It's like when your phone can't connect to Wi-Fi.
This code indicates a communication error between control modules in the vehicle via the FlexRay network.
The P325B code is triggered when the vehicle's control module detects a problem with the FlexRay communication network. FlexRay is a high-speed communication system used to connect various control modules in modern vehicles, ensuring they can exchange data reliably and quickly. This error suggests that there is a disruption in this communication, which could affect the vehicle's safety functions.
• Warning lights on the dashboard
• Malfunction of vehicle safety systems
• Intermittent electrical issues
• Faulty control module
• Damaged FlexRay wiring or connectors
• Software issue in the control module
FlexRay: A high-speed communication protocol used in vehicles.
Control Module: An electronic device that controls various functions in a vehicle.
• Check for additional error codes.
• Inspect FlexRay wiring and connectors for damage.
• Perform a software update on the control modules.
• Replace damaged wiring or connectors.
• Reprogram or replace faulty control module.
• Clear the error codes and test drive the vehicle.
• OBD-II scanner
• Multimeter
• Diagnostic software
$200 - $800
Moderate
• BMW 3 Series
• Audi A4
• Mercedes-Benz C-Class
• Regular maintenance checks
• Keep software updated
• Inspect wiring for wear and tear
Communication Error
• Avoid driving at high speeds until repaired.
• Consult a professional mechanic for diagnosis.
• Do not ignore warning lights on the dashboard.
Check with the vehicle manufacturer as some communication errors might be covered under warranty.
This code is relatively rare and typically associated with high-end vehicles that use advanced communication systems.
Moderate – It is important to address this issue to ensure vehicle safety systems are functioning properly.
Driving with malfunctioning safety systems can be dangerous. Address this issue promptly to ensure compliance with safety regulations.
• Vehicle at operating temperature
• All electrical systems active
The FlexRay network is distributed throughout the vehicle, connecting various control modules.
Q: Can I drive with a P325B code?
A: It's not recommended as it may affect safety systems. Get it checked soon.
Q: What happens if I ignore this code?
A: Ignoring it can lead to malfunctioning safety features and potentially more costly repairs.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.