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 MANUALSCHEVROLET2020EXPRESS 2500 LS, 2.8L ENG VIN 1REPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEBODY, CAB CONTROL SYSTEMSVEHICLE ACCESS SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B3140, B3145, B3150, OR B3155COMPONENT TESTING
2020 Chevrolet Express 2500 LS, 2.8L Eng VIN 1
Component Testing
2020 Chevrolet Express 2500 LS, 2.8L Eng VIN 1SECTION Component Testing
Door Lock Switch
- Ignition OFF, disconnect the harness connector at the appropriate S13 Door Lock Switch.
- Test for infinite resistance between the signal terminal and the ground terminal listed below with the switch in the center position.
- Signal terminal F and the ground terminal A @ S13D Door Lock Switch-Driver
- Signal terminal G and the ground terminal A @ S13D Door Lock Switch-Driver
- Signal terminal F and the ground terminal A @ S13P Door Lock Switch-Passenger
- Signal terminal G and the ground terminal A @ S13P Door Lock Switch-Passenger
- Signal terminal A and the ground terminal E @ S13A Door Lock Switch-Rear Cargo
- Signal terminal D and the ground terminal E @ S13A Door Lock Switch-Rear Cargo
- If less than infinite resistance
Replace the S13 Door Lock Switch.
- Go to next step: If infinite resistance
- Test for less than 2 Ω between the signal terminal and the ground terminal listed below with the switch in the Lock position.
- Signal terminal G and the ground terminal A @ S13D Door Lock Switch-Driver
- Signal terminal G and the ground terminal A @ S13P Door Lock Switch-Passenger
- Signal terminal D and the ground terminal E @ S13A Door Lock Switch-Rear Cargo
- If 2 Ω or greater
Replace the S13 Door Lock Switch.
- Go to next step: If less than 2 Ω
- Test for less than 2 Ω between the signal terminal and the ground terminal listed below with the switch in the Unlock position.
- Signal terminal F and the ground terminal A @ S13D Door Lock Switch-Driver
- Signal terminal F and the ground terminal A @ S13P Door Lock Switch-Passenger
- Signal terminal A and the ground terminal E @ S13A Door Lock Switch-Rear Cargo
- If 2 Ω or greater
Replace the S13 Door Lock Switch.
- Go to next step: If less than 2 Ω
- All OK
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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.