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U1705 RAM Code - Telematics Connectivity Module Signal Invalid

Quick Answer

The U1705 code indicates that the Telematics Connectivity Module (TCM) is reporting an invalid signal, which can significantly impact the vehicle's communication systems. Common causes include Faulty Telematics Connectivity Module, Telematics Connectivity Module harness is open or shorted, Poor electrical connection in the Telematics Connectivity Module circuit. 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
U1705 RAM indicates Telematics Connectivity Module Signal Invalid.
Common causes
Common causes include Faulty Telematics Connectivity Module, Telematics Connectivity Module harness is open or shorted, Poor electrical connection in the Telematics Connectivity Module circuit.
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 Nov 10, 2025
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Code U1705 RAM Description

The U1705 code indicates that the Telematics Connectivity Module (TCM) is reporting an invalid signal, which can significantly impact the vehicle's communication systems. The TCM is responsible for facilitating various connected vehicle services, including navigation, emergency assistance, and remote diagnostics. When the TCM detects an issue, it communicates with other vehicle modules via the Controller Area Network (CAN) bus, which is essential for the proper functioning of multiple systems in the vehicle. If the TCM is unable to send or receive valid signals, it can lead to a failure in these services, affecting the overall connectivity and functionality of the vehicle.
OBDII Code U1705 RAM - Telematics Connectivity Module Signal Invalid
U1705 RAM Code - Telematics Connectivity Module Signal Invalid

Common Causes of U1705 RAM

  1. Faulty Telematics Connectivity Module
  2. Telematics Connectivity Module harness is open or shorted
  3. Poor electrical connection in the Telematics Connectivity Module circuit
  4. Corroded or damaged connectors affecting signal transmission
  5. Software issues or firmware corruption within the Telematics Connectivity Module

Symptoms of U1705 RAM

  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Loss of connectivity features such as navigation and emergency services
  3. Inability to access remote vehicle functions via mobile applications
  4. Erratic behavior of the vehicle's infotainment system
  5. Potential security alerts or warnings related to vehicle data integrity

How to Fix U1705 RAM

  1. Perform a visual inspection of the Telematics Connectivity Module and its wiring harness for damage or corrosion.
  2. Check the electrical connections and ensure they are secure and free from debris.
  3. Test the Telematics Connectivity Module using a diagnostic scanner to confirm the fault and check for any additional codes.
  4. If necessary, replace the Telematics Connectivity Module with a new unit and reprogram it according to manufacturer specifications.
  5. Clear the diagnostic codes and perform a road test to ensure that the issue has been resolved and all connectivity features are functioning properly.

Cost to Fix U1705 RAM

The cost to diagnose and repair the U1705 code can vary widely based on the specific issue and the vehicle make and model. Typically, parts for a new Telematics Connectivity Module can range from $200 to $600, with labor costs averaging between $80 and $150 per hour. Dealerships may charge higher rates, while independent shops might offer more competitive pricing. Overall, the total repair cost can range from $300 to $1,000, depending on the complexity of the repair and any additional issues discovered during diagnosis.

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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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