• Check Engine Light is on
• Poor fuel efficiency
• Possible difficulty in starting the vehicle
• Faulty Fuel Additive Control Module
• Open or shorted wiring harness
• Poor electrical connection
PCM: Powertrain Control Module
FACM: Fuel Additive Control Module
• U0100
• U0140
This code means that the car's computer tried to talk to one of the parts, but it couldn't understand what the part was saying. It's like when you call a friend and the line is all fuzzy, so you can't hear them clearly.
The U0629 code indicates a communication error with a specific module in the vehicle.
U0629 is a diagnostic trouble code (DTC) for 'Lost Communication With Fuel Additive Control Module.' This means that the vehicle's main computer, the Powertrain Control Module (PCM), has lost communication with the Fuel Additive Control Module (FACM).
• Use an OBD-II scanner to check for the U0629 code and any other related codes.
• Inspect the wiring and connectors to the Fuel Additive Control Module for damage or corrosion.
• Test the Fuel Additive Control Module for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the Fuel Additive Control Module if faulty.
• Clear the codes and test drive the vehicle to ensure the issue is resolved.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Ford Focus
• Chevrolet Cruze
• Volkswagen Jetta
• Regularly inspect and maintain vehicle wiring.
• Ensure all connectors are clean and secure.
• Schedule periodic vehicle diagnostics.
Communication Error
• Have the vehicle inspected by a professional mechanic.
• Avoid ignoring the Check Engine Light as it may lead to further issues.
Check with the vehicle manufacturer for warranty coverage on electronic components.
U0629 is a relatively uncommon code, often associated with vehicles that use fuel additives for emission control.
Moderate – It's important to address this issue to maintain vehicle performance and efficiency.
Driving with a malfunctioning control module may affect emissions and could be illegal in some areas.
• Vehicle in park with the engine running.
• All electrical systems active.
The Fuel Additive Control Module is typically located near the fuel tank or in the rear of the vehicle.
Q: What does the Fuel Additive Control Module do?
A: It manages the addition of fuel additives to help reduce emissions and improve engine performance.
Q: Can I drive with a U0629 code?
A: While you may be able to drive, it's recommended to address the issue to prevent potential damage and maintain efficiency.
