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 something unexpected when checking how the engine's power is being calculated. It's like when you do math homework and get a weird answer that doesn't make sense.
The engine control module (ECM) monitors the torque calculations to ensure they are within expected parameters. If the calculations are not plausible, the ECM triggers this code.
P320C is triggered when the ECM detects a discrepancy in the torque calculation data received from the Active Front Steering (AFS) system. This could be due to a communication error or a fault in the sensors or actuators involved in the torque calculation process.
• Check Engine Light on
• Reduced engine performance
• Unusual steering behavior
• Faulty torque sensor
• Communication error between modules
• Defective AFS control module
ECM: Engine Control Module
AFS: Active Front Steering
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors related to the AFS system.
• Check the torque sensor for proper operation.
• Replace faulty torque sensor.
• Repair or replace damaged wiring/connectors.
• Reprogram or replace the AFS control module.
• OBD-II scanner
• Multimeter
• Torque sensor tester
$150 - $500
Moderate
• BMW 3 Series
• Audi A4
• Mercedes-Benz C-Class
• Regular maintenance of the steering system.
• Ensure all software updates are applied.
• Inspect wiring and connectors periodically.
Engine Performance
• Avoid driving at high speeds until the issue is resolved.
• Consult a professional mechanic for a thorough diagnosis.
Check with your vehicle manufacturer; this may be covered under powertrain or emissions warranty.
This code has been associated with vehicles equipped with advanced steering systems, particularly those with AFS technology.
Moderate – The vehicle may still be drivable, but performance and safety could be compromised.
Driving with this code active may not comply with emissions regulations and could pose a safety risk.
• Vehicle at operating temperature
• Stable road conditions
The AFS control module is typically located near the steering column or integrated with the vehicle's main control module.
Q: Can I drive my car with this code?
A: It's possible, but not recommended due to potential safety and performance issues.
Q: Will this code clear itself?
A: It may clear if the underlying issue is resolved, but it's best to have a professional reset it after repairs.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
View on Amazon
Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
View on Amazon
Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.