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 MANUALSGMC2016SAVANA 3500 BASE, VAN CARGO EXTENDED, 6.6L ENG VIN LREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMDATA COMMUNICATION SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC U0074: CONTROL MODULE POWERTRAIN EXPANSION COMMUNICATION BUS OFFCONDITIONS FOR SETTING THE DTC
2016 GMC Savana 3500 Base, Van Cargo Extended, 6.6L Eng VIN L
Conditions for Setting the DTC
2016 GMC Savana 3500 Base, Van Cargo Extended, 6.6L Eng VIN LSECTION Conditions for Setting the DTC
The control module setting the DTC has attempted to establish communications on the powertrain high speed GMLAN serial data circuits more than 3 times.
RENDER: 1.0x
NO RELATED
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Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.