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.
Diagnostic Fault Information
2012 Buick VeranoSECTION Diagnostic Fault Information
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| Ground (DLC, terminal 5) | - | 1 | - | - |
| Mid Speed GMLAN Serial Data (+) | U0074 | U0074, 2* | U0074 | - |
| Mid Speed GMLAN Serial Data (-) | U0074 | U0074, 2* | U0074 | - |
| Chassis High Speed GMLAN Serial Data (+) | U0074 | U0074, 2* | U0074 | - |
| Chassis High Speed GMLAN Serial Data (-) | U0074 | U0074, 2* | U0074 | - |
| * An open between the data link connector (DLC) and the first splice will only effect the communication with the scan tool. The vehicle control modules will still communicate. 1. No communication on any mid speed or chassis high speed GMLAN module. 2. An open in only one mid speed or chassis high speed GMLAN serial data circuit may allow degraded communication between the controls modules. |
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RENDER: 1.0x
NO RELATED
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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.