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.
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HOMESERVICE MANUALSCHEVROLET2016IMPALA LS, 3.6L ENG VIN NREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISDATA COMMUNICATION SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC U0077: CONTROL MODULE COMMUNICATION CHASSIS EXPANSION CAN BUS OFFDIAGNOSTIC FAULT INFORMATION
2016 Chevrolet Impala LS, 3.6L Eng VIN N
Diagnostic Fault Information
2016 Chevrolet Impala LS, 3.6L Eng VIN NSECTION Diagnostic Fault Information
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| Chassis High Speed GMLAN Serial Data (+) | U0077 | U0077, U0100-U02FF* | U0077 | - |
| Chassis High Speed GMLAN Serial Data (-) | U0077 | U0077, U0100-U02FF* | U0077 | - |
| Ground (DLC, terminal 5) | - | 1 | - | - |
| *An open in only one chassis high speed GMLAN serial data circuit may allow degraded communication between the devices. An open between the Data Link Connector (DLC) and the first splice/device will only affect the communication with the scan tool. The devices will still communicate. 1. No communication with any chassis high speed GMLAN device. |
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RENDER: 1.0x
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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.