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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2291 (KEYLESS ENTRY SYSTEM AND REMOTE FUNCTIONS)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B3123DIAGNOSTIC FAULT INFORMATION
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Diagnostic Fault Information
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Diagnostic Fault Information
WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| Keyless Entry Antenna Signal - LF Door | B3119 00 | B3119 00 | B3119 00 | - |
| Keyless Entry Antenna Low Reference - LF Door | - | B3119 05 | - | - |
| Keyless Entry Antenna Signal - RF Door | B3120 00 | B3120 00 | B3120 00 | - |
| Keyless Entry Antenna Low Reference - RF Door | - | B3120 05 | - | - |
| Keyless Entry Antenna Signal - Rear Compartment | B3121 00 | B3121 00 | B3121 05 | - |
| Keyless Entry Antenna Low Reference - Rear Compartment | - | B3121 00 | - | - |
| Keyless Entry Antenna Signal - Console Passive | B3123 00 | B3123 00 | B3123 00 | - |
| Keyless Entry Antenna Low Reference - Console Passive | - | B3123 00 | - | - |
| Keyless Entry Antenna Ignition - Console Active | B3122 00 | B3122 00 | B3122 00 | - |
| Keyless Entry Antenna Data Signal - Console Active | B3122 00 | B3122 00 | B3122 00 | - |
| Keyless Entry Antenna Clock Signal - Console Active | B3122 00 | B3122 00 | B3122 00 | - |
| Keyless Entry Antenna Low Reference - Console Active | - | B3122 00 | - | - |
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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.