U1899 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 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 Description
What are the Possible Causes of the DTC U1899?
- 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?
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 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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Need Help with the Code?
Get the U1899 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- U1899 Buick — Starter/Generator Control Module Lost Communication With Powertrain Control Module
- U1899 Cadillac — Starter/Generator Control Module Lost Communication With Powertrain Control Module
- U1899 Chevrolet — Starter/Generator Control Module Lost Communication With Powertrain Control Module
- U1899 GMC — Starter/Generator Control Module Lost Communication With Powertrain Control Module
Frequently Asked Questions about U1899 Code
1. What are the common symptoms of OBDII code U1899?
- Common symptoms include starting issues, stalling, poor engine performance, and the illumination of the check engine light.
2. What are the possible causes of U1899 code?
- The code U1899 can be caused by a faulty starter/generator control module, issues with the powertrain control module, wiring problems, or communication network issues.
3. How is the U1899 code diagnosed?
- The U1899 code is diagnosed using a professional OBDII scanner that can read and interpret manufacturer-specific codes. The diagnostic process may involve checking for communication faults between modules and inspecting wiring connections.
4. Can the U1899 code be cleared/reset without fixing the underlying issue?
- Clearing the U1899 code without addressing the root cause is not recommended, as the issue may persist and lead to further problems with the vehicle's operation.
5. What are the repair options for fixing the U1899 code?
- Repair options include inspecting and repairing wiring connections, replacing the starter/generator control module or powertrain control module if faulty, and addressing any communication network issues.
6. Is it safe to continue driving with the U1899 code present?
- It is not recommended to continue driving with the U1899 code present, as it can lead to potential starting or performance issues that may compromise the safety and reliability of the vehicle.
7. How much does it typically cost to repair the U1899 code?
- The cost of repairing the U1899 code can vary depending on the specific cause of the issue, the extent of the repair needed, and labor rates. It is advisable to consult a professional technician for an accurate cost estimate.
8. Can a DIY enthusiast repair the U1899 code themselves?
- DIY enthusiasts with the necessary knowledge and tools may be able to diagnose and repair the U1899 code themselves, especially if the issue is related to wiring connections. However, complex module replacements may require professional assistance.
9. Are there preventive measures to avoid the U1899 code from reoccurring?
- Regular maintenance, such as checking and cleaning electrical connections, ensuring proper grounding, and addressing any warning signs promptly, can help prevent the U1899 code from reoccurring.
10. How long does it typically take to repair the U1899 code?
- The repair time for the U1899 code can vary depending on the specific cause of the issue, the availability of parts, and the complexity of the repair. It is advisable to consult a professional technician for an estimated repair timeline.
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