U1147 Chevrolet Code - Lost Communication With Onstar
Quick Answer
Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Onstar, Onstar harness is open or shorted, Onstar 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
- U1147 Chevrolet indicates Lost Communication With Onstar.
- Common causes
- Common causes include Faulty Onstar, Onstar harness is open or shorted, Onstar 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 U1147 Chevrolet Description
What are the Possible Causes of the DTC U1147 Chevrolet?
- Faulty Onstar
- Onstar harness is open or shorted
- Onstar circuit poor electrical connection
How to Fix the DTC U1147 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 U1147 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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Frequently Asked Questions about U1147 Chevrolet Code
What does the OBDII code U1147 mean for my Chevrolet?
The U1147 code indicates that there is a lost communication issue with the OnStar system in your Chevrolet vehicle.
What symptoms might I notice if my vehicle has the U1147 code?
Common symptoms include the OnStar system not responding, failure of remote services, and potential warning lights on the dashboard.
What could cause the U1147 code to appear?
Causes can include a faulty OnStar module, wiring issues, blown fuses, or problems with the vehicle’s communication network.
How can I diagnose the U1147 code?
Start by checking for any blown fuses, inspect the wiring and connectors for damage, and use a scan tool to check for additional trouble codes that may provide more context.
What should I do if I find the U1147 code?
If you encounter the U1147 code, check the OnStar module and its connections first. If necessary, consult a professional mechanic for further diagnosis.
Can I clear the U1147 code without fixing the problem?
While you can clear the code with an OBDII scanner, the issue may reoccur if the underlying problem is not addressed.
Is there a chance that the U1147 code is a temporary issue?
Yes, it's possible that the code could be a temporary glitch, especially if it appears after a battery disconnect or a software update. However, persistent codes typically indicate a deeper issue.
How much might it cost to repair the issue related to the U1147 code?
Repair costs can vary widely but might range from a simple fuse replacement to hundreds of dollars if the OnStar module needs replacement.
Can I still drive my Chevrolet if the U1147 code is present?
Yes, you can still drive the vehicle, but you may lose access to certain OnStar features until the issue is resolved.
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