AutoCodes – Chevrolet – U18CC Chevrolet

U18CC Chevrolet Code - Transmission Range Control Module Lost Communication With ECM On Powertrain Expansion Bus

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine 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: U18CC Chevrolet indicates Transmission Range Control Module Lost Communication With ECM On Powertrain Expansion Bus.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine 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 717

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
Comments
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Code U18CC 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 U18CC Chevrolet - Transmission Range Control Module Lost Communication With ECM On Powertrain Expansion Bus - AutoCodes.com — U18CC Chevrolet Code - Transmission Range Control Module Lost Communication With ECM On Powertrain Expansion Bus

What does this mean?

What are the Possible Causes of the DTC U18CC Chevrolet?

Faulty Engine Control Module (ECM)
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection

How to Fix the DTC U18CC 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 U18CC 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 U18CC Chevrolet Code

1. What are the common symptoms of OBDII code U18CC in a Chevrolet related to the Transmission Range Control Module lost communication with ECM on Powertrain Expansion Bus?

- Common symptoms may include issues shifting gears, transmission slipping, hesitation or lack of power, and illuminated warning lights on the dashboard.

2. What could cause the Transmission Range Control Module to lose communication with the ECM in a Chevrolet, triggering code U18CC?

- Possible causes include damaged wiring or connectors, a faulty Transmission Range Control Module, a malfunctioning ECM, or issues with the Powertrain Expansion Bus communication network.

3. How can I diagnose the cause of OBDII code U18CC in my Chevrolet?

- Diagnostic tools like an OBDII scanner can help identify the specific communication error between the Transmission Range Control Module and ECM. A thorough inspection of wiring, connectors, and modules may be required.

4. Is it safe to drive my Chevrolet with OBDII code U18CC present?

- It is not recommended to continue driving your Chevrolet with code U18CC, as it can lead to potential transmission issues and affect the overall performance of the vehicle. Immediate attention and repair are advised.

5. Can a DIY enthusiast repair OBDII code U18CC in a Chevrolet, or is professional assistance necessary?

- While basic troubleshooting like checking for loose connections or damaged wiring can be done by a DIY enthusiast, repairing the underlying cause of code U18CC may require professional assistance due to the complexity of the transmission and communication systems involved.

6. Are there any temporary solutions or quick fixes for OBDII code U18CC in a Chevrolet?

- Temporary solutions like resetting the ECM or Transmission Range Control Module may temporarily clear the code, but a permanent fix will require identifying and resolving the root cause of the communication issue.

7. How much does it typically cost to repair OBDII code U18CC related to the Transmission Range Control Module in a Chevrolet?

- The cost of repair can vary depending on the specific cause of the communication error. It may range from a simple wiring repair to replacing the Transmission Range Control Module or ECM, potentially costing a few hundred to a few thousand dollars.

8. Can weather conditions or driving habits contribute to triggering OBDII code U18CC in a Chevrolet?

- Extreme weather conditions or rough driving habits can potentially exacerbate existing communication issues between the Transmission Range Control Module and ECM, leading to the triggering of code U18CC.

9. How long does it typically take to repair OBDII code U18CC in a Chevrolet at a professional repair shop?

- The repair time can vary based on the diagnostic process, availability of parts, and complexity of the repair. In general, it may take a few hours to a full day to diagnose and fix the issue related to code U18CC.

10. Can resetting the error codes using an OBDII scanner resolve OBDII code U18CC in a Chevrolet?

- Resetting the error codes may temporarily clear the warning lights, but if the underlying communication issue between the Transmission Range Control Module and ECM persists, code U18CC is likely to reappear. A thorough diagnosis and repair are recommended for a permanent solution.