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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 89 (ENGINE CONTROLS - SELF-DIAGNOSTICS - 4.0L)DIAGNOSTIC TESTSDTC P0410: SECONDARY AIR INJECTION SYSTEMCONDITIONS FOR SETTING DTC
1999 GMC Forward Control 5.7 R, Automatic
Conditions For Setting DTC
1999 GMC Forward Control 5.7 R, AutomaticSECTION Conditions For Setting DTC
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
Passive Tests
- During the operation of the AIR pump, the HO2S voltage for both fuel control sensors is more than 250 mV for 20 seconds (200 mV for 7 seconds on a hot start).
- When the AIR pump is turned OFF, the HO2S voltage for both fuel control sensors is less than 740 mV for 20 second (7 seconds on a hot start).
- The condition is present for 3 occurrences.
Active Test
- The HO2S voltage for both fuel control sensors is more than 250 mV for 3 occurrences.
RENDER: 1.0x
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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.