AutoCodes – Chevrolet – U2626 Chevrolet

U2626 Chevrolet Code - Reductant Control Module Lost Communication With Engine 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 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: U2626 Chevrolet indicates Reductant Control Module Lost Communication With Engine Control Module On Powertrain Sensor CAN 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 1,231

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 18, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U2626 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 when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U2626 Chevrolet - Reductant Control Module Lost Communication With Engine Control Module On Powertrain Sensor CAN Bus - AutoCodes.com — U2626 Chevrolet Code - Reductant Control Module Lost Communication With Engine Control Module On Powertrain Sensor CAN Bus

What does this mean?

What are the Possible Causes of the DTC U2626 Chevrolet?

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

How to Fix the DTC U2626 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 U2626 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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Need more information on how to fix the U2626 Chevrolet code? Get Access to Factory Service Manuals

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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 U2626 Chevrolet Code

1. What are common symptoms of OBDII code U2626 in a Chevrolet?

- Common symptoms include the Malfunction Indicator Lamp (MIL) being illuminated, reduced engine power, and potential issues with the vehicle's emissions system.

2. What does the code U2626 in a Chevrolet indicate?

- This code indicates that there is a communication problem between the Reductant Control Module and the Engine Control Module on the Powertrain Sensor CAN Bus.

3. What are possible causes of the U2626 code in a Chevrolet?

- Possible causes include damaged wiring or connectors in the communication network, a faulty Reductant Control Module, a faulty Engine Control Module, or software issues.

4. How can I diagnose the U2626 code in my Chevrolet?

- Diagnosis typically involves using a scan tool to retrieve the fault codes, checking the wiring and connectors for any damage, and testing the Reductant Control Module and Engine Control Module for proper function.

5. Can I continue driving my Chevrolet with the U2626 code present?

- It is not recommended to drive the vehicle with the U2626 code present, as it can lead to reduced engine power and potential emissions system issues.

6. How is the U2626 code typically repaired in a Chevrolet?

- Repairing the U2626 code often involves repairing any damaged wiring or connectors, replacing the Reductant Control Module or Engine Control Module if necessary, and clearing the fault codes.

7. Are there any DIY tips for fixing the U2626 code in a Chevrolet?

- DIY tips include checking for loose or damaged wires, ensuring connectors are secure, and following diagnostic procedures outlined in the vehicle's service manual.

8. Can a faulty sensor trigger the U2626 code in a Chevrolet?

- While it is possible for a faulty sensor to contribute to communication issues, the U2626 code is primarily related to a loss of communication between the Reductant Control Module and Engine Control Module.

9. How long does it typically take to repair the U2626 code in a Chevrolet?

- The repair time can vary depending on the exact cause of the issue, but it may take anywhere from a few hours to a full day to diagnose and repair the U2626 code.

10. Is it necessary to reset the fault codes after repairing the U2626 code in a Chevrolet?

- Yes, it is important to clear the fault codes using a scan tool after repairing the U2626 code to ensure the issue has been properly addressed and the MIL is turned off.