U2626 GMC 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 GMC 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.
Code U2626 GMC Description
The Diagnostic Trouble Code (DTC) will set when a supervised periodic message that includes the transmitter device availability has not been received.
What are the Possible Causes of the DTC U2626 GMC?
- 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 GMC?
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 GMC 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.
Need more information about the U2626 GMC code?
Need more information on how to fix the U2626 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the U2626 GMC code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about U2626 GMC Code
What does the OBDII code U2626 mean for my GMC vehicle?
The U2626 code indicates that there is a communication loss between the Reductant Control Module and the Engine Control Module on the Powertrain Sensor CAN Bus.
What are the common symptoms associated with the U2626 code?
Common symptoms may include reduced engine power, warning lights on the dashboard, and failure of the emissions system, specifically related to the diesel exhaust fluid (DEF) system.
What could cause the U2626 code to appear in my GMC?
Causes can include wiring issues, faulty connectors, a defective Reductant Control Module, or problems within the Engine Control Module itself.
How can I diagnose a U2626 code?
Start by using an OBDII scanner to confirm the code, then inspect wiring and connectors for damage, check the Reductant Control Module for faults, and ensure proper communication on the CAN Bus.
Can I still drive my vehicle if the U2626 code is present?
It is not recommended to drive the vehicle as it may enter a limp mode to protect the engine, and it could lead to further damage or increased emissions.
What are some common repair tips for fixing the U2626 code?
Inspect and repair any damaged wiring and connectors, replace the Reductant Control Module if faulty, and reprogram or replace the Engine Control Module if necessary.
Will clearing the U2626 code fix the issue permanently?
Clearing the code may turn off the warning lights temporarily, but if the underlying problem is not addressed, the code will likely reappear.
Is the U2626 code serious, and what are the potential consequences?
Yes, the U2626 code is serious as it can affect vehicle performance and emissions compliance, potentially leading to fines or failing an emissions test.
How much might it cost to repair the issues related to the U2626 code?
Repair costs can vary widely depending on the specific cause, but it could range from a few hundred dollars for wiring repairs to over a thousand for module replacements.
Discuss the causes and fixes for U2626 GMC OBDII Code
Code U2626 GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
