2007 Chevrolet Tahoe P0120 Code: Is Throttle Body Replacement Necessary?
My wife drives a 2007 Chevrolet Tahoe LT 4WD with 47,000 miles. It has never had any prior issues, but recently the check engine light came on. The only fault code detected is P012-0 (Throttle Position Sensor Circuit Malfunction). There are no noticeable performance problems—engine runs smoothly and normally. A local dealership recommends replacing the throttle body and its connector at a cost of $800. Is this the most logical first step, or could there be another underlying cause? I'm looking for advice on whether to proceed with this repair or explore alternative diagnostics before spending that much. Any insights would be greatly appreciated.
Yes, modern vehicles like the 2007 Chevrolet Tahoe use electronic throttle bodies instead of mechanical ones, which can lead to intermittent issues. I recommend starting with replacing just the connector first—this is often a cheaper and more cost-effective step. I've seen cases where after replacing the throttle body, the issue persisted because the real problem was actually in the wiring harness or connector. Additionally, there may be a PCM (Powertrain Control Module) reprogramming requirement to resolve this specific P0120 code. However, I'm not at work right now, so this isn't 100% confirmed.