AutoCodes – Chevrolet – U18D2 Chevrolet

U18D2 Chevrolet Code - Lost Communication With Transmission Range Selector Control Module On Powertrain Sensor CAN Bus

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Transmission Range Control Module, Transmission Range Control Module harness is open or shorted, Transmission Range Control Module circuit poor electrical connection. 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: U18D2 Chevrolet indicates Lost Communication With Transmission Range Selector Control Module On Powertrain Sensor CAN Bus.
Common causes: Common causes include Faulty Transmission Range Control Module, Transmission Range Control Module harness is open or shorted, Transmission Range Control Module circuit poor electrical connection.
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.

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Code Popularity 1,204

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
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Code U18D2 Chevrolet Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device. The Diagnostic Trouble Code (DTC) will set a supervised periodic message that includes the transmitter device availability that has not been received.

OBDII Code U18D2 Chevrolet - Lost Communication With Transmission Range Selector Control Module On Powertrain Sensor CAN Bus - AutoCodes.com — U18D2 Chevrolet Code - Lost Communication With Transmission Range Selector Control Module On Powertrain Sensor CAN Bus

What does this mean?

What are the Possible Causes of the DTC U18D2 Chevrolet?

Faulty Transmission Range Control Module
Transmission Range Control Module harness is open or shorted
Transmission Range Control Module circuit poor electrical connection

How to Fix the DTC U18D2 Chevrolet?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U18D2 Chevrolet code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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.

Frequently Asked Questions about U18D2 Chevrolet Code

What does the OBDII code U18D2 for a Chevrolet indicate?

The code U18D2 indicates that there has been a lost communication with the Transmission Range Selector Control Module on the Powertrain Sensor CAN Bus in a Chevrolet vehicle. This means the main vehicle computer (ECU) is unable to communicate with the control module that determines the position of the transmission gear selector.

What are common symptoms of code U18D2 in a Chevrolet?

Common symptoms of code U18D2 may include the transmission failing to change gears properly, the vehicle being stuck in a particular gear, the Check Engine Light turning on, and possibly the gear position indicator on the dashboard displaying incorrect information or not working at all.

What can cause the OBDII code U18D2 to appear in a Chevrolet?

This code can be triggered by several issues, including faulty wiring or connections in the CAN bus, a defective transmission range selector module, issues with the vehicleâ€™s ECU, or a disruption in the power supply to the transmission range selector module.

How can I troubleshoot and repair the OBDII code U18D2 in a Chevrolet?

To repair code U18D2, start by checking the wiring and connections related to the transmission range selector control module for any signs of damage or loose connections. Also, check the moduleâ€™s power supply and ground connections. If no issues are found, diagnostic testing with a professional scan tool to further investigate the communication failure may be necessary.

Is it safe to drive a Chevrolet with the code U18D2 present?

While it might be possible to drive a vehicle with this code present, it is not advisable. The transmission may not operate correctly, which can lead to safety issues, including unexpected vehicle behavior. It's best to address the problem promptly.

What tools are required to diagnose the code U18D2 in a Chevrolet?

Diagnosing the code U18D2 typically requires a professional OBDII scanner that can read CAN bus data, a multimeter for checking wiring and voltages, and potentially an oscilloscope to examine the communication signals on the CAN bus in detail.