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 MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 350 (ENGINE CONTROLS - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P0121: THROTTLE POSITION SENSOR CIRCUIT INSUFFICIENT ACTIVITYCONDITIONS FOR RUNNING DTC
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
Conditions For Running DTC
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Conditions For Running DTC
WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
- DTCs P0106, P0107, P0108, P0122, P0123, P0506, or P0507 are not set.
- Engine run time is more than 30 seconds.
- Engine coolant temperature is more than 32°F (0°C).
- MAP reading is less than 55 kPa for a TP sensor skewed high test.
- MAP reading is more than 64 kPa for a TP sensor skewed low test.
- MAP is steady for 5 seconds or more.
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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.