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02 sierra 2500HD 8.1

Cudahemi

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Cudahemi Enthusiast

Cudahemi

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Posted

So out of the blue I replaced my alternator and started up the truck and my gas pedal is hard can’t push it down to accelerate.did a computer scan and had hard codes of p1221 and p1120 which says tps ?

Formulabruce Enthusiast

Formulabruce

Posted
Posted

Drive by Cable throttle, check out where the cable meets the throttle body.

carkhz316 Enthusiast

carkhz316

Posted
Posted

The 8.1 is actually drive by wire despite it being pre-'2003. Since your gas pedal isn't directly connected to the engine, I would suspect that something failed inside the sensor portion of the pedal to cause it to mechanically bind up. As far as the TPS codes, it could very likely be related, but I'd start with the pedal/ APP sensor first.

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