AutoCodes – Cadillac – U2626 Cadillac

U2626 Cadillac 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 Cadillac 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 449

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 18, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U2626 Cadillac 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 Cadillac - Reductant Control Module Lost Communication With Engine Control Module On Powertrain Sensor CAN Bus - AutoCodes.com — U2626 Cadillac 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 Cadillac?

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 Cadillac?

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 Cadillac 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 U2626 Cadillac Code

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

The common symptoms include the Check Engine light illuminating, poor engine performance, and potential issues with the reductant control system.

2. What does the OBDII code U2626 in a Cadillac indicate?

This code indicates that the reductant control module has lost communication with the engine control module on the powertrain sensor CAN bus.

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

Possible causes include damaged wiring or connectors in the CAN bus system, a faulty reductant control module, a malfunctioning engine control module, or software issues.

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

Diagnosis involves inspecting the wiring and connectors in the CAN bus system, testing the reductant control module and engine control module, and checking for software updates.

5. Can I drive my Cadillac with the U2626 code?

It is not recommended to drive your Cadillac with the U2626 code present, as it can lead to poor engine performance and potential damage to the reductant control system.

6. How do I repair the U2626 code in my Cadillac?

Repairing the U2626 code may involve repairing or replacing damaged wiring or connectors, replacing the reductant control module or engine control module if faulty, and updating software as needed.

7. Is the U2626 code a serious issue in a Cadillac?

While the U2626 code may not cause immediate drivability issues, it should be addressed promptly to prevent potential damage to the reductant control system and ensure proper engine performance.

8. Can I reset the U2626 code in my Cadillac with a simple OBDII scanner?

Resetting the code with an OBDII scanner may temporarily clear the Check Engine light, but it is important to diagnose and repair the underlying issue causing the U2626 code.

9. Will the U2626 code cause my Cadillac to fail an emissions test?

The U2626 code is related to the reductant control system, which plays a role in emissions control. It is possible that this code could cause your Cadillac to fail an emissions test.

10. How can I prevent the U2626 code from reoccurring in my Cadillac?

Regular maintenance, including checking and maintaining the CAN bus system, keeping the reductant control module and engine control module in good condition, and addressing any related issues promptly, can help prevent the U2626 code from reoccurring.