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 MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 381 (ENGINE CONTROLS SELF-DIAGNOSTICS - 3.4L)DIAGNOSTIC TESTSDTC P0121: TP SENSOR PERFORMANCECONDITIONS FOR SETTING THE DTC
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Conditions For Setting The DTC
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Conditions For Setting The DTC
WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
- The PCM detects that the TP sensor voltage is more than the predicted value when the MAP sensor pressure is less than 50 kPa.
- The PCM detects that the TP sensor voltage is less than the predicted value when the MAP sensor pressure is more than 70 kPa.
- The conditions are met for 5 seconds.
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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.