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Engine-Codes – Generic – U1146

U1146 Code - Lost Communication With External Memory

Quick Answer

The U1146 code indicates that the vehicle's onboard computer has lost communication with an external memory device. Common causes include Faulty Wiring: Damaged or corroded wiring in the communication circuit can disrupt the data exchange between the onboard computer and the external memory, Loose Connectors: Loose or improperly connected connectors between components can lead to intermittent communication errors, Failed External Memory Device: A malfunctioning external memory device, such as a module or sensor, can trigger the U1146 code. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
U1146 indicates Lost Communication With External Memory.
Common causes
Common causes include Faulty Wiring: Damaged or corroded wiring in the communication circuit can disrupt the data exchange between the onboard computer and the external memory, Loose Connectors: Loose or improperly connected connectors between components can lead to intermittent communication errors, Failed External Memory Device: A malfunctioning external memory device, such as a module or sensor, can trigger the U1146 code.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code U1146 Description

The U1146 code indicates that the vehicle's onboard computer has lost communication with an external memory device. In modern vehicles, various systems rely on external memory for storing critical information, such as sensor data, calibration settings, and other important parameters. When the communication link between the vehicle's computer and the external memory is disrupted, it can lead to performance issues and malfunctions in different systems.

OBDII Code U1146 - Lost Communication With External Memory
U1146 Code - Lost Communication With External Memory

Common Causes of U1146

  1. Faulty Wiring: Damaged or corroded wiring in the communication circuit can disrupt the data exchange between the onboard computer and the external memory.
  2. Loose Connectors: Loose or improperly connected connectors between components can lead to intermittent communication errors.
  3. Failed External Memory Device: A malfunctioning external memory device, such as a module or sensor, can trigger the U1146 code.
  4. Software Issues: Software glitches or programming errors in the vehicle's computer system can also cause communication disruptions.

Symptoms of U1146

  1. Check Engine Light: The most common symptom associated with the U1146 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Erratic Engine Performance: The engine may exhibit erratic behavior, such as rough idling, hesitation, or a noticeable decrease in performance.
  3. Transmission Issues: Communication loss with external memory can also lead to transmission problems, such as harsh shifting or gear slippage.
  4. Unresponsive Systems: Various vehicle systems, such as ABS, traction control, or climate control, may become unresponsive or exhibit abnormal behavior.

How to Fix U1146

  1. Diagnostic Scan: Begin by performing a comprehensive diagnostic scan using a professional OBD-II scanner to retrieve the trouble codes and pinpoint the source of the communication error.
  2. Visual Inspection: Inspect the wiring harness, connectors, and external memory devices for any signs of damage, corrosion, or loose connections. Repair or replace any faulty components as needed.
  3. Reset the System: Clear the trouble codes from the vehicle's computer system and reset the communication link with the external memory device.
  4. Test Drive: After completing the repairs, test drive the vehicle to ensure that the communication issue has been resolved and that all systems are functioning correctly.
  5. Follow-Up Scan: Perform a final diagnostic scan to confirm that the U1146 code has been successfully cleared and that communication with the external memory is restored.

Cost to Fix U1146

The typical repair costs for addressing the U1146 code can vary depending on the extent of the issue and the specific components requiring repair or replacement. In general, the cost of parts for this repair can range from $50 to $300, while labor costs may range from $100 to $300, depending on the shop's hourly rates and the complexity of the repair. Additional costs may be incurred if any components need to be replaced. It is advisable to consult with a trusted auto repair shop for a more accurate estimate based on the vehicle's make and model, as well as the localized labor rates.

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Code U1146 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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