U1818 2015 Chevrolet Silverado Code - Lost Communication with Engine Control Module on Powertrain Expansion Communication Bus
Quick Answer
Devices connected to the powertrain high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine 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
- U1818 2015 Chevrolet Silverado indicates Lost Communication with Engine Control Module on Powertrain Expansion Communication Bus.
- Common causes
- Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine 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 U1818 2015 Chevrolet Silverado Description
The Diagnostic Trouble Code (DTC) will be set when a supervised periodic message that includes the transmitter device availability has not been received.
What are the Possible Causes of the DTC U1818 2015 Chevrolet Silverado?
- Faulty Engine Control Module (ECM)
- Engine Control Module harness is open or shorted
- Engine Control Module circuit poor electrical connection
How to Fix the DTC U1818 2015 Chevrolet Silverado?
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 U1818 2015 Chevrolet Silverado 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.
Need more information about the U1818 2015 Chevrolet Silverado code?
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Frequently Asked Questions about U1818 2015 Chevrolet Silverado Code
1. What are the common symptoms of OBDII code U1818 on a 2015 Chevrolet Silverado?
- Common symptoms include the check engine light coming on, issues with engine performance, and potential communication problems with the Engine Control Module (ECM).
2. What does the U1818 code "Lost Communication with Engine Control Module on Powertrain Expansion Communication Bus" mean?
- This code indicates a communication problem between the Powertrain Control Module (PCM) and the Engine Control Module (ECM) on the powertrain expansion communication bus.
3. What are some possible causes of U1818 code on a 2015 Chevrolet Silverado?
- Possible causes include damaged wiring or connectors, a faulty ECM or PCM, software issues, or a problem with the powertrain expansion communication bus itself.
4. How can I diagnose the U1818 code on my 2015 Chevrolet Silverado?
- Diagnosis typically involves checking the wiring and connectors for damage, ensuring proper power and ground connections, and using a scan tool to communicate with the ECM and PCM.
5. Can I still drive my Chevrolet Silverado with the U1818 code present?
- It is not recommended to continue driving with this code present, as it can affect engine performance and potentially lead to further issues. It is best to address the problem promptly.
6. How can I repair the U1818 code on my 2015 Chevrolet Silverado?
- Repair may involve repairing or replacing damaged wiring, connectors, or modules, updating software if necessary, and ensuring proper communication between the ECM and PCM.
7. Is it possible to clear the U1818 code without fixing the underlying issue?
- Clearing the code without addressing the underlying problem may temporarily turn off the check engine light, but the issue will likely return until the root cause is resolved.
8. Can a DIY enthusiast fix the U1818 code on a 2015 Chevrolet Silverado?
- Depending on the cause of the code, some DIY enthusiasts may be able to address the issue by checking and repairing wiring or connectors. However, more complex issues may require professional assistance.
9. How much does it typically cost to repair the U1818 code on a 2015 Chevrolet Silverado?
- The cost of repairing this code can vary widely depending on the cause of the issue, the extent of the repairs needed, and whether professional assistance is required. Costs may range from a simple fix to more significant repairs.
10. What happens if the U1818 code is ignored on a 2015 Chevrolet Silverado?
- Ignoring the U1818 code can lead to potential engine performance issues, communication problems between modules, and may result in the vehicle failing an emissions test. It is best to address the problem promptly.
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