Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer found a problem with a message it received about how much power the engine should use. It's like getting a confusing text message that doesn't make sense.
The engine control module (ECM) monitors signals and messages related to torque calculations. If it detects an error in the message or the message doesn't pass the 'alive check' or 'checksum' verification, it triggers this code.
P320A indicates that the ECM has detected an error in the communication related to torque calculation from the Active Front Steering (AFS) system. This error could be due to a failed 'alive check' or an incorrect checksum, which are methods used to verify the integrity and authenticity of data messages.
• Check Engine Light illuminated
• Potential steering performance issues
• Reduced engine power
• Faulty Active Front Steering (AFS) module
• Wiring issues or poor connections
• Faulty ECM or software issue
ECM: Engine Control Module
AFS: Active Front Steering
Checksum: A method to verify data integrity
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connections related to the AFS module.
• Check for any updates or known issues with the ECM software.
• Repair or replace damaged wiring or connectors.
• Replace the AFS module if faulty.
• Reprogram or update the ECM software if necessary.
• OBD-II scanner
• Multimeter
• Diagnostic software for ECM reprogramming
$200 - $800
Moderate
• BMW 3 Series
• Audi A4
• Mercedes-Benz C-Class
• Regularly check and maintain vehicle wiring.
• Keep ECM software up to date.
• Avoid harsh driving conditions that may damage electronic components.
Communication Error
• Drive cautiously if the Check Engine Light is on.
• Have the vehicle inspected by a professional as soon as possible.
Check with the vehicle manufacturer for specific warranty coverage related to electronic components.
This code is relatively uncommon and often related to newer vehicles with advanced steering systems.
Moderate – It should be addressed soon to prevent potential steering issues.
Ignoring this code may lead to steering performance issues, which could impact vehicle safety.
• Vehicle in operation
• ECM actively monitoring torque calculations
The AFS module is typically located near the steering column or within the vehicle's dashboard.
Q: Can I drive with a P320A code?
A: It's possible to drive, but it's recommended to have the issue checked soon to avoid potential steering problems.
Q: Will this code clear itself?
A: The code may clear if the issue is intermittent, but it's best to diagnose and repair the problem.
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