U0146 GMC Code - Lost Communication With Serial Data Gateway Module
Quick Answer
Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Serial Data Gateway Module, Serial Data Gateway Module harness is open or shorted, Serial Data Gateway 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
- U0146 GMC indicates Lost Communication With Serial Data Gateway Module.
- Common causes
- Common causes include Faulty Serial Data Gateway Module, Serial Data Gateway Module harness is open or shorted, Serial Data Gateway 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 U0146 GMC Description
Pictures shown may vary from actual
What are the Possible Causes of the DTC U0146 GMC?
- Faulty Serial Data Gateway Module
- Serial Data Gateway Module harness is open or shorted
- Serial Data Gateway Module circuit poor electrical connection
How to Fix the DTC U0146 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 U0146 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.
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Frequently Asked Questions about U0146 GMC Code
1. What does the GMC OBDII code U0146 mean?
U0146 indicates a loss of communication between the vehicle’s modules and the Serial Data Gateway Module.
2. What are the common symptoms of code U0146 in a GMC vehicle?
Symptoms may include warning lights on the dashboard, loss of communication with certain modules, inoperative vehicle features, or intermittent functionality.
3. What causes the U0146 code to appear in GMC vehicles?
Common causes include a faulty Serial Data Gateway Module, damaged wiring or connectors, or issues with the CAN (Controller Area Network) bus system.
4. Can a dead battery trigger code U0146 in a GMC?
Yes, a dead or weak battery, or a recent jump start, can disrupt communication and trigger the U0146 code.
5. How can I diagnose the U0146 code on a GMC vehicle?
Use an OBDII scanner to confirm the code, inspect the wiring and connectors for damage, and test the Serial Data Gateway Module for proper function.
6. What tools are needed to troubleshoot the U0146 code?
You’ll need an OBDII scanner, a digital multimeter, and potentially a wiring diagram for the vehicle’s CAN bus system.
7. Can I drive my GMC with the U0146 code active?
It depends on the severity of the issue. If critical systems are affected, driving may not be safe, and the issue should be addressed promptly.
8. How do I fix the U0146 code in my GMC?
Repairs may include replacing the Serial Data Gateway Module, repairing or replacing damaged wiring, or reprogramming the module if needed.
9. Is the U0146 code specific to GMC vehicles?
No, the U0146 code is a generic OBDII code, but its specific implications and repair steps can vary by make and model.
10. How much does it cost to fix the U0146 code on a GMC vehicle?
Costs can range from $100 to $1,000 depending on whether the issue is a wiring repair, module replacement, or reprogramming.
Discuss the causes and fixes for U0146 GMC OBDII Code
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