U1899 GMC Code - Starter/Generator Control Module Lost Communication With Powertrain Control Module
Quick Answer
Modules connected to the class 2 and high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Powertrain Control Module (PCM), Powertrain Control Module harness is open or shorted, Powertrain 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
- U1899 GMC indicates Starter/Generator Control Module Lost Communication With Powertrain Control Module.
- Common causes
- Common causes include Faulty Powertrain Control Module (PCM), Powertrain Control Module harness is open or shorted, Powertrain 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 U1899 GMC Description
What are the Possible Causes of the DTC U1899 GMC?
- Faulty Powertrain Control Module (PCM)
- Powertrain Control Module harness is open or shorted
- Powertrain Control Module circuit poor electrical connection
- Faulty Starter/Generator Control Module (SGCM)
How to Fix the DTC U1899 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 U1899 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 U1899 GMC Code
1. What does the OBDII code U1899 GMC indicate?
- The code U1899 indicates that the Starter/Generator Control Module has lost communication with the Powertrain Control Module in a GMC vehicle.
2. What are common symptoms of U1899 code in a GMC vehicle?
- Common symptoms include issues with starting the vehicle, poor acceleration, decreased fuel efficiency, and sometimes the vehicle may go into a limp mode.
3. What can cause the U1899 code to be triggered in a GMC vehicle?
- The code U1899 can be triggered due to a faulty Starter/Generator Control Module, a malfunction in the Powertrain Control Module, damaged wiring, or poor electrical connections.
4. How can I diagnose the U1899 code in my GMC vehicle?
- Diagnosing the U1899 code typically involves using a diagnostic scanner to retrieve the code, checking the wiring and connections between the Starter/Generator Control Module and the Powertrain Control Module, and conducting a thorough inspection of the modules themselves.
5. Is it safe to drive with the U1899 code present in my GMC vehicle?
- It is not recommended to drive with the U1899 code present, as it can lead to potential performance issues or even sudden stalling of the vehicle.
6. How can the U1899 code in a GMC vehicle be repaired?
- Repairing the U1899 code often involves addressing the root cause, which could be replacing a faulty module, repairing damaged wiring, or fixing poor electrical connections.
7. Can I reset the U1899 code in my GMC vehicle with a basic OBDII scanner?
- While you can reset the code with a basic OBDII scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.
8. Are there any common mistakes to avoid when dealing with the U1899 code in a GMC vehicle?
- One common mistake to avoid is overlooking simple causes such as loose connections or wiring issues, as these can often be the culprit behind the U1899 code.
9. Can a DIY enthusiast fix the U1899 code in a GMC vehicle, or is professional help recommended?
- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address the U1899 code themselves. However, if unsure, it is recommended to seek professional help to avoid further complications.
10. How can I prevent the U1899 code from appearing in my GMC vehicle in the future?
- Regularly inspecting and maintaining the electrical components, ensuring proper connections, and addressing any issues promptly can help prevent the U1899 code from appearing in the future.
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