• Check Engine Light is on
• Vehicle may not start
• Various systems may not function properly
• Faulty actuator control module
• Open or shorted wiring harness
• Poor electrical connection
PCM: Powertrain Control Module
DTC: Diagnostic Trouble Code
• U0100
• U0140
This code means that the car's computer is having trouble talking to one of the parts that helps control the car. It's like when you try to call a friend, but your phone can't connect.
The U0657 code indicates a communication problem between the car's control modules.
U0657 is a diagnostic trouble code (DTC) for 'Lost Communication With Actuator Control Module'. It means that the vehicle's main computer, the powertrain control module (PCM), is unable to communicate with one of the actuator control modules.
• Check for additional codes and address them first.
• Inspect wiring and connectors for damage.
• Test the actuator control module for proper operation.
• Repair or replace damaged wiring.
• Ensure all connectors are secure.
• Replace the actuator control module if necessary.
• OBD-II scanner
• Multimeter
• Wiring diagram
$150 - $600
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect wiring harnesses for damage.
• Keep electrical connections clean and secure.
• Perform routine diagnostic checks.
Communication Error
• Avoid driving the vehicle until the issue is resolved.
• Consult a professional mechanic for accurate diagnosis.
• Regular maintenance can prevent such issues.
Check with your vehicle manufacturer for specific warranty coverage on electronic components.
Communication errors like U0657 have become more common as vehicles have become more reliant on complex electronic systems.
Moderate – Communication issues can lead to other problems if not addressed promptly.
Ignoring communication errors can lead to safety issues. Always consult with a professional mechanic.
• Vehicle ignition on
• Modules powered and active
The actuator control module is typically located in the engine bay or under the dashboard.
Q: Can I still drive my car with a U0657 code?
A: It's not recommended to drive with this code, as it may affect vehicle performance and safety.
Q: How serious is a U0657 code?
A: It's moderately serious. It should be addressed to ensure proper vehicle function.
