U179C 2017 GMC Sierra Code - Lost Communication with One or More Hybrid/EV Battery Interface Control Modules
Quick Answer
The Hybrid/EV Powertrain Control Module 2 communicates with the Hybrid/EV Battery Interface Control Modules via a dedicated bus inside the Hybrid/EV Battery Pack assembly. Common causes include Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted, Hybrid/EV Battery Interface 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
- U179C 2017 GMC Sierra indicates Lost Communication with One or More Hybrid/EV Battery Interface Control Modules.
- Common causes
- Common causes include Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted, Hybrid/EV Battery Interface 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 U179C 2017 GMC Sierra Description
What are the Possible Causes of the DTC U179C 2017 GMC Sierra?
- Faulty Hybrid/EV Battery Interface Control Module
- Hybrid/EV Battery Interface Control Module harness is open or shorted
- Hybrid/EV Battery Interface Control Module circuit poor electrical connection
How to Fix the DTC U179C 2017 GMC Sierra?
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 U179C 2017 GMC Sierra 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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Frequently Asked Questions about U179C 2017 GMC Sierra Code
1. What does OBDII code U179C mean on a 2017 GMC Sierra?
Code U179C indicates a "Lost Communication with One or More Hybrid/EV Battery Interface Control Modules," meaning there’s an issue with data exchange between the main control module and a hybrid/EV battery interface module.
2. What are the common symptoms of code U179C on a 2017 GMC Sierra?
Symptoms may include a check engine light, reduced hybrid/EV system performance, limited power mode, or inoperative hybrid functionality.
3. What causes the U179C code to appear on a GMC Sierra?
Common causes include a faulty hybrid/EV battery interface control module, damaged wiring or connectors, software glitches, or communication bus issues.
4. Can a U179C code cause drivability issues?
Yes, it can lead to reduced power, limited EV mode functionality, or complete failure of the hybrid system, depending on the severity of the issue.
5. How do you diagnose a U179C code on a 2017 GMC Sierra?
Diagnosis involves checking for additional codes, inspecting the wiring and connectors for damage, testing the battery interface control module, and ensuring proper communication on the CAN bus network.
6. Can a software update fix the U179C code?
In some cases, a software update to the control module can resolve communication errors, but this depends on the specific cause of the issue.
7. Is it safe to drive a 2017 GMC Sierra with a U179C code?
Driving may be possible but not recommended, as it could lead to reduced performance or further damage to the hybrid/EV system.
8. How much does it cost to repair a U179C code on a GMC Sierra?
Repair costs vary widely but may include diagnostic fees, wiring repairs, or module replacement, typically ranging from $200 to over $1,000 depending on the issue.
9. Can a loose connection cause the U179C code?
Yes, a loose or corroded connector in the hybrid/EV battery interface control module circuit can trigger this code.
10. What tools are needed to troubleshoot a U179C code?
A professional-grade scan tool capable of reading hybrid/EV-specific codes, a multimeter for electrical testing, and access to the vehicle’s wiring diagrams are essential for diagnosis.
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