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 MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 28 (ENGINE CONTROL SYSTEM - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P0121: TP SENSOR PERFORMANCETEST DESCRIPTION
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2
Test Description
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Test Description
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers in the diagnostic procedures.
- 1 - The Diagnostic System Check - Engine Controls prompts the technician to complete some basic checks and store freeze frame data, if applicable. This creates an electronic copy of data taken when fault occurred. Information is then stored in scan tool for later reference.
- 2 - Throttle angle percentage should steadily increase without binding or a large percentage jump.
- 3 - This step determines if DTC P0121 is the result of a hard failure or an intermittent condition.
- 4 - This step determines if DTC P0121 is the result of a hard failure or an intermittent condition.
- 5 - This step inspects for excessive resistance in reference voltage circuit. If test light does not illuminate at all, there is resistance in the circuit.
- 7 - When 5-volt reference circuit is jumpered to TP sensor input circuit, scan tool parameter should read near 100 percent.
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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.