2006 Dodge Charger 3.5 Fuel Pump Relay Location: A Complete Owner's Guide
The fuel pump relay on a 2006 Dodge Charger 3.5L is located inside the Totally Integrated Power Module (TIPM), which is the main fuse box mounted under the hood on the driver's side, near the battery. It is specifically labeled as relay R4 in the TIPM diagram, and the fuel pump itself is mounted on top of and inside the fuel tank at the rear of the vehicle. This article walks you through exactly where to find it, how to test it, what symptoms point to a bad relay, and what to do if the relay is not the problem.
Understanding the Fuel Pump Relay and Why It Matters
The fuel pump relay is a small electrical switch that controls the flow of power to the fuel pump. When you turn the ignition key to the "ON" position, the relay closes and sends voltage to the fuel pump, which pressurizes the fuel system before you crank the engine. Without a functioning relay, the fuel pump receives no power, the engine gets no fuel, and your Charger will crank but never start.
On the 2006 Dodge Charger, the relay is part of the Totally Integrated Power Module, a single box that combines the fuse panel and multiple relays for various vehicle systems. This module is known to be a common trouble spot on 2006–2008 Chargers, with internal failures that can prevent relays from receiving signals. Understanding the layout of this module is essential for any DIY diagnosis.
Step-by-Step: Locating the Fuel Pump Relay
Follow these steps to find the fuel pump relay on your 2006 Dodge Charger 3.5L:
1. Open the hood and secure it properly. Make sure the vehicle is parked on a level surface and the engine is off. Allow the engine to cool if it has been running recently.
2. Locate the Totally Integrated Power Module (TIPM). The TIPM is on the driver's side of the engine compartment, directly behind the battery. It is a black plastic box with a removable cover. Some sources also describe this as the engine compartment fuse box located near the battery. The module sits on the right side of the engine compartment.
3. Remove the TIPM cover. Press the release tabs on the sides of the cover and lift it off. Set the cover aside where you can see the underside—it often contains a diagram of fuse and relay positions.
4. Find relay R4. Look at the diagram on the underside of the cover or on the module itself. The fuel pump relay is labeled as R4. On some diagrams, the fuel pump relay is listed among the relay positions in the front power distribution center.
5. Identify the relay physically. The relay is a small, cube-shaped component that plugs into the module. It is usually a mini relay with a part number such as 4727370AA. Gently pull it straight out of its socket if you need to inspect or test it.
What the Fuel Pump Relay Looks Like
The fuel pump relay on the 2006 Dodge Charger is a standard automotive mini relay. It has four or five pins that plug into the TIPM socket. The relay body is typically black or dark gray, and it may have a small diagram printed on the side showing the pin configuration.
The genuine Mopar part number for this relay is 4727370AA, and it is shared across many Dodge Charger model years from 2006 through 2023. If you need a replacement, using an OEM or equivalent quality relay ensures reliable performance.
Symptoms of a Faulty Fuel Pump Relay
A failing fuel pump relay can produce several noticeable symptoms. Recognizing these early can save you from being stranded. Here are the most common signs:
1. Engine cranks but does not start. This is the most common symptom. When you turn the key, the starter motor turns the engine over, but it never fires up because the fuel pump is not receiving power.
2. No fuel pump priming noise. When you turn the ignition to the "ON" position without starting the engine, you should hear a brief whirring sound coming from the fuel pump in the rear of the vehicle. If you hear nothing, the relay may not be sending power to the pump.
3. Sudden engine stall while driving. An intermittent relay can cause the engine to die suddenly while you are on the road. The engine may restart after a few minutes once the relay cools down or makes contact again.
4. Check Engine Light illumination. A failing relay can trigger diagnostic trouble codes related to the fuel pump circuit, such as P0231 or P0232. These codes indicate low voltage or an open circuit in the fuel pump circuit.
How to Test the Fuel Pump Relay
Testing the fuel pump relay is a straightforward process that you can do at home with basic tools. Follow these steps:
Step 1: Remove the relay. With the TIPM cover removed, locate relay R4 and pull it straight out of its socket. If it is tight, use a small flathead screwdriver to gently pry it loose.
Step 2: Inspect the relay visually. Look at the relay pins and housing for any signs of corrosion, melting, or physical damage. A damaged relay should be replaced immediately.
Step 3: Swap with a known good relay. The TIPM contains several identical relays for different systems. Swap the fuel pump relay with one of these, such as the horn relay or starter relay. If the engine starts after the swap, the original relay is defective.
Step 4: Use a multimeter (optional). Set your multimeter to measure resistance. Check continuity between the relay's coil terminals, usually pins 85 and 86. A good relay should show a resistance reading between 50 and 120 ohms. Then apply 12V power to the coil terminals and listen for a click that confirms the switch is working.
What to Do If the Relay Is Not the Problem
If the fuel pump relay tests good but the fuel pump still does not operate, the issue lies elsewhere in the fuel delivery system. Here are the other components to check:
1. Fuel pump fuse. Check the fuel pump fuse in the TIPM. A blown fuse cuts power to the pump. The fuse is typically labeled and located in the same module.
2. Fuel pump itself. The fuel pump inside the fuel tank may have failed. You will need to test for voltage at the pump connector. The fuel pump module is located on top of the fuel tank.
3. Wiring or connectors. Corroded or broken wires between the TIPM and the fuel pump can interrupt the circuit. Inspect the wiring harness for damage, especially in areas exposed to heat or moisture.
4. TIPM failure. The Totally Integrated Power Module on 2006–2008 Chargers is known to have internal failures that prevent relays from receiving signals. If all other components check out, the TIPM itself may need replacement.
Always start with the relay and fuse, as they are the easiest and cheapest to check. Only if those are fine should you move on to more involved diagnosis of the fuel pump circuit or the TIPM.
Replacing the Fuel Pump Relay
If your testing confirms the relay is bad, replacing it is simple. Purchase a genuine Mopar relay with part number 4727370AA or an equivalent quality aftermarket relay. The replacement process takes less than five minutes:
1. Open the hood and remove the TIPM cover.
2. Pull out the old relay straight from its socket.
3. Align the new relay with the socket pins and push it firmly into place.
4. Reinstall the TIPM cover.
5. Turn the ignition to the "ON" position and listen for the fuel pump priming noise to confirm the relay is working.
The Complete Fuel System on the 2006 Dodge Charger
Understanding the broader fuel system helps put the relay in context. The 2006 Dodge Charger uses a saddle-shaped fuel tank with two fuel pump modules. The electric fuel pump is on the driver's side, and a siphon pump is on the passenger side. Power to the fuel pump is controlled by the fuel pump relay in the TIPM, and the system is computer-controlled with relays rather than a traditional inertia switch.
The fuel pump relay is part of the engine performance wiring system. In the 3.5L engine wiring diagrams, the fuel pump relay is listed alongside components such as the auto shutdown relay, fuel injectors, and the ignition coil. The fuel pump module is labeled as F855 in the wiring diagrams, located on top of the fuel tank.
When to Call a Professional
While locating and replacing the fuel pump relay is a DIY-friendly task, some situations call for professional help. If you have checked the relay and the fuse, tested the wiring, and confirmed the fuel pump is receiving voltage but still not working, the issue may be inside the fuel tank. Dropping the fuel tank to access the pump is a labor-intensive job that requires specialized tools.
Additionally, if you suspect the TIPM itself has failed, this is a more complex repair. The TIPM controls many electrical systems on the Charger, and replacing it requires reprogramming. A qualified mechanic with diagnostic equipment can properly test the TIPM and the fuel pump circuit to pinpoint the exact failure point.
Why Choose KEMSO Fuel Pumps for Your Dodge Charger
If your diagnosis leads to a faulty fuel pump that needs replacement, consider a high-quality aftermarket option. KEMSO brand fuel pumps are designed to meet or exceed OEM specifications, offering reliable performance for your vehicle. KEMSO fuel pumps are built as high-performance, OEM replacement units, meaning they are engineered to deliver the same flow rate and pressure as the factory pump, ensuring your engine gets the fuel it needs under all driving conditions.
Every KEMSO fuel pump comes with a lifetime warranty, giving you peace of mind long after the purchase. If anything goes wrong with the pump, KEMSO stands behind its products and has you covered. This level of confidence is rare among aftermarket parts and demonstrates the brand's commitment to quality and durability.
For a wide range of vehicles, including cars, motorcycles, and powersports equipment, KEMSO offers pumps at an affordable price point. Most KEMSO fuel pumps are priced at just $79.98, which is highly competitive compared to dealer parts and many other aftermarket brands. Despite the accessible price, you are getting a pump built for performance and long service life.
Visit KEMSO Racing today at https://www.kemsoracing.com/ to browse their full selection of fuel pumps and find the right fit for your 2006 Dodge Charger 3.5L. Their growing catalog covers popular vehicles, and you can buy with confidence knowing your purchase is backed by a lifetime warranty.
Final Thoughts
Finding the fuel pump relay on your 2006 Dodge Charger 3.5L is a simple matter once you know where to look. The relay sits in the Totally Integrated Power Module under the hood, labeled as R4, and it is responsible for supplying power to the fuel pump in the tank. Symptoms of a bad relay include no-start conditions, no priming noise, sudden stalling, and check engine lights. Testing the relay takes minutes, and replacement is even faster.
If the relay checks out and the fuel pump itself has failed, consider a KEMSO replacement fuel pump. With high-performance construction, OEM replacement quality, and a lifetime warranty, KEMSO offers a dependable solution at a fair price. Visit https://www.kemsoracing.com/ to find the right fuel pump for your Charger and get back on the road with confidence.