Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2015 Chevrolet Impala Limited LTFACTORY OEM SERVICE PROCEDURE
Data Communication System
- Schematic Wiring Diagrams
- Data Communication Wiring Schematics
- Body Control System Wiring Schematics
- Power and Ground
- Data Link, Starting and Charging, Engine Controls, AT Shift Lock Controls, Cruise Control, ABS, Brake Warning, Headlights/DRL and Fog Lights References
- Exterior Lights, Interior Lights, Interior Lights Dimming, Power Moding, and Door Lock/Indicator References
- Door Lock/Indicator Cont, Theft Deterrent, Horns, Steering Wheel, Upfitter Provisions, Wiper/Washer, and Release System References
- Diagnostic Information and Procedures
- Control Module U Code List
- DTC B1000: ECU Performance/Side Object Detection
- DTC B1001: Option Configuration
- DTC B1016: VIN Not Programmed
- DTC B101D: Electronic Control Unit Hardware
- DTC B101E: Electronic Control Unit Software
- DTC C0550: Electronic Control Unit
- DTC U0020: Low Speed CAN Communication Bus
- DTC U0073 or U2100: Communication Bus
- DTC U0100 - U02FF: Control Module
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC U1814: Powertrain High Speed Communication
- DTC U1826 or U1827: Lost Communication Module
- DTC U2099: High Speed Communication
- Symptoms - Data Communications
- Scan Tool Does Not Power Up
- Scan Tool Does Not Communicate with High Speed GMLAN Device
- Scan Tool Does Not Communicate with Low Speed GMLAN Device
- Data Link References
- Repair Instructions
- Description and Operation
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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