Ford Transit-350 HD throttle body power loss with speed drop from 60 mph to 20 mph, sensor replacement needed on Ford Transit-350 HD

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Ford Transit-350 HD owners report experiencing significant power loss, characterized by a drop in speed from 60 mph to 20 mph, potentially due to a faulty throttle body that affects air intake control and leads to erratic speed fluctuations. Additionally, these owners may find that sensor issues, particularly with the throttle pedal position sensor, necessitate replacement to resolve the problem. Various causes of power loss, including air and fuel intake issues, can trigger the engine service light and contribute to decreased performance. In cases where the throttle body is damaged, replacement may be essential to restore functionality, with costs ranging from $450 to $650, and potentially up to $1,000 for high-end models. For those considering DIY maintenance, cleaning electrical connections related to the gas pedal and throttle body may help troubleshoot these power loss issues. Prompt attention to these concerns is crucial for maintaining the vehicle's performance.

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