• Speedometer not working
• Erratic speed readings
• Check engine light on
• Faulty speed sensor module
• Damaged wiring or connectors
• Faulty ECU
ECU: Engine Control Unit
DTC: Diagnostic Trouble Code
• U0121
• U0122
This code means that the car's computer is having trouble talking to the speed sensor. It's like when your phone can't connect to the internet.
The U0120 code indicates a loss of communication with the speed sensor module.
U0120 is a diagnostic trouble code (DTC) indicating that the vehicle's main computer (ECU) has lost communication with the speed sensor module. This can affect the vehicle's ability to measure and display speed accurately.
• Check for other codes
• Inspect wiring and connectors
• Test the speed sensor module
• Replace faulty speed sensor
• Repair damaged wiring
• Reprogram or replace ECU
• OBD-II scanner
• Multimeter
• Wiring diagram
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regular maintenance checks
• Ensure connectors are secure
• Avoid harsh driving conditions
Communication Error
• Avoid driving at high speeds until fixed
• Consult a professional mechanic
• Do not ignore the check engine light
Check with your vehicle manufacturer for warranty coverage on electronic components.
U0120 has been a common code for vehicles with electronic speed sensor systems, often related to wiring issues.
Moderate – It should be addressed soon to ensure accurate speed readings and vehicle safety.
Driving with an inaccurate speedometer can lead to speeding violations and unsafe driving conditions.
• Vehicle ignition on
• Vehicle in motion
The speed sensor module is typically located near the transmission or wheel hub.
Q: Can I drive with a U0120 code?
A: It's not recommended to drive with this code as it can affect speed readings and vehicle safety.
Q: Will a U0120 code cause my car to fail emissions?
A: No, this code is related to communication issues and should not affect emissions directly.
