The PCM (Powertrain Control Module) fuse and relay are vital components in ensuring the PCM operates smoothly. They act as gatekeepers for the flow of electrical power to the PCM, which is essentially the brain of your F-150’s engine. Having a good grasp of where to locate these essential components is key to effectively diagnosing and resolving any PCM-related problems that may arise in your F-150.

Understanding the PCM Fuse and Relay.

The PCM (Powertrain Control Module) in your Ford F-150 serves as the brain of the vehicle, receiving signals and data from various sensors to efficiently control the engine and transmission. However, if there are issues with the PCM, it can result in a range of problems, including difficulty starting the vehicle, poor engine performance, gear engagement issues, and increased emissions. Before jumping to the conclusion that the PCM is faulty, it’s crucial to check the PCM fuse and relay in your F-150.

Learn more about the location of PCM Fuse and Relay for other year models of the Ford F-150.

Where is the 2004 Ford F-150 PCM Fuse and Relay Located ?

In the 2004 Ford F-150, the PCM fuse and relay are located in under dash fuse box. In the under-dash fuse box, fuse number 5, 20, 29, and 34, which is assigned for the Keep alive memory for Powertrain Control Module (PCM), PCM 4×4 power, PCM 4×4 power and PCM power respectively . Additionally, relay R203 is assigned to the PCM relay, in the under-dash fuse box.

2004 Ford F-150 PCM Relay and Fuse Location.

In the 2004 Ford F-150, the PCM fuse and relay is located in the under-dash fuse panel.

2004 ford f 150 passenger compartment fuse box location

2004 Ford F-150 PCM Relay and Fuse Location in Fuse Box Diagram.

Position of PCM fuse and relay in under dash fuse box as seen below pic.

YearFuse FunctionFuse NoLocation 
2004Keep alive memory for Powertrain Control Module (PCM)5Under DashCheck more about Ford F-150 2004 Fuse Box Diagram and Location.

2004PCM 4×4 power20Under Dash
2004PCM 4×4 power29Under Dash
2004PCM power34Under Hood
2004PCM Power RelayR203Under Hood


Familiarizing yourself with the location and function of the PCM fuse and relay can help you troubleshoot and address any PCM related issues efficiently.

WARNING: The terminal and harness assignments for individual connectors may vary depending on the vehicle’s equipment level, model, and market. It is recommended to refer to the fuse box diagram provided at the back of the fuse box cover for accurate information.

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