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 MANUALSCHEVROLET2019TAHOE LS, 4WD, GAS/ETHANOLREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 60 (LIGHTING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSTOP LAMPS MALFUNCTIONCIRCUIT/SYSTEM VERIFICATION
2019 Chevrolet Tahoe LS, 4WD, Gas/Ethanol
Circuit/System Verification
2019 Chevrolet Tahoe LS, 4WD, Gas/EthanolSECTION Circuit/System Verification
WARNING: This page is about a different car, the 2018 Chevrolet Sonic. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON.
- Verify the scan tool Brake Lamps Command parameter changes between Active and Inactive while pressing and releasing the brake pedal.
- If the parameter does not change
Refer to Brake Pedal Position Sensor Malfunction below.
- Go to next step: If the parameter changes
- If the parameter does not change
- Verify the left brake lamp turns ON and OFF when commanding the Left Rear Brake/Park Lamp ON and OFF with a scan tool.
- If the left brake lamp does not turn ON and OFF
Refer to Stop Lamps Malfunction below.
- Go to next step: If the left brake lamp turns ON and OFF
- If the left brake lamp does not turn ON and OFF
- Verify the right brake lamp turns ON and OFF when commanding the Right Rear Brake/Park Lamp ON and OFF with a scan tool.
- If the right brake lamp does not turn ON and OFF
Refer to Stop Lamps Malfunction below.
- Go to next step: If the right brake lamp turns ON and OFF
- If the right brake lamp does not turn ON and OFF
- Verify the center high mounted stop lamp turns ON and OFF when commanding the Center Brake Lamp ON and OFF with a scan tool.
- If the center high mounted stop does not turn ON and OFF
Refer to Center High Mount Stop Lamp Malfunction below.
- Go to next step: If the center high mounted stop turns ON and OFF
- If the center high mounted stop does not turn ON and OFF
- 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.