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 95 (ENGINE CONTROLS/FUEL - 1.8L (LUW LWE) - DTC P0010 TO DTC P0420)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0411COMPONENT TESTING
2019 Chevrolet Tahoe LS, 4WD, Gas/Ethanol
Component Testing
2019 Chevrolet Tahoe LS, 4WD, Gas/EthanolSECTION Component Testing
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.
Relay Test
- Ignition OFF, disconnect the appropriate relay.
- Test for 70 - 110 Ω between terminals 85 - 86.
- If less than 70 Ω or greater than 110 Ω
Replace the relay.
- Go to next step: If between 70 - 110 Ω
- If less than 70 Ω or greater than 110 Ω
- Test for infinite resistance between the terminals listed below:
- 30 and 86
- 30 and 87
- 30 and 85
- 85 and 87
- If less than infinite resistance
Replace the relay.
- Go to next step: If infinite resistance
- Install a 15 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground.
- Test for less than 2 Ω between terminals 30 and 87.
- If 2 Ω or greater
Replace the relay.
- Go to next step: If less than 2 Ω
- If 2 Ω or greater
- 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.