2012 Dodge Ram 1500 5.7 Fuel Pump Relay Location: Where It Is, How to Test It, and What to Do When It Fails

The bottom line up front: On a 2012 Dodge Ram 1500 with the 5.7L HEMI engine, the fuel pump relay is not a standalone plug-in unit you can pull out of the fuse box. It is an internal relay circuit soldered onto the board inside the Totally Integrated Power Module (TIPM), which is the large black fuse and relay center mounted under the hood on the driver's side, near the battery and strut tower. If your truck cranks but won't start, or you hear no fuel pump priming sound when you turn the key, the fuel pump relay inside the TIPM is often the first thing to suspect. Because the relay is embedded in the TIPM, you cannot simply swap it with a horn relay like you could on older trucks. The good news: there is a proven, inexpensive workaround—an external relay bypass—that can get you back on the road without spending $1,500 or more on a new TIPM.

Why the Fuel Pump Relay on the 2012 Ram 1500 Is a Known Problem

The 2012 Dodge Ram 1500 uses a TIPM to control nearly all electrical functions, including the fuel pump relay. This design saves space under the hood but creates a real headache when the relay fails, because the relay itself is a surface-mount component soldered directly to the circuit board inside the TIPM. You cannot just snap in a new relay from the auto parts store.

For 2011–2014 Chrysler, Dodge, and Ram vehicles, the TIPM fuel pump relay is a documented weak point. Many owners report intermittent no-start conditions, stalling, or the fuel pump not priming even though the pump itself tests fine. In some cases, replacing the TIPM with a new or rebuilt unit fixes the problem temporarily, but the same relay circuit can fail again. This is why many DIYers and mechanics choose to bypass the internal relay entirely with an external relay kit wired directly to the fuel pump.

Where Exactly Is the TIPM and the Fuel Pump Relay?

Here is the precise location for your 2012 Dodge Ram 1500 5.7:

1. Open the hood. The TIPM is mounted in the engine bay on the driver's side, near the battery and the strut tower. It is a large black plastic box with a cover that snaps off.

2. Remove the TIPM cover. Lift the cover off and set it aside. The underside of the cover has a diagram that maps out every fuse and relay location.

3. Look for the fuel pump relay label. On the diagram, the fuel pump relay position is typically labeled. However, on this generation of Ram trucks, the fuel pump relay is not visible as a plug-in component—it is an internal relay soldered to the TIPM circuit board. To access it for testing, you would need to unbolt the TIPM from its mounting bracket and inspect the underside, which requires specialized tools and soldering skills.

4. Know your fuse. The fuel pump fuse is usually a 20-amp fuse located in the TIPM. On some models, the fuse slot is labeled M25 or F70. Pull it and check for continuity with a multimeter, or simply look for a blown element.

If you have a 2002–2005 Dodge Ram, the relay is sometimes still a swappable unit in the Power Distribution Center (PDC). But on your 2012 model, it is internal and non-serviceable without TIPM repair or replacement.

Common Symptoms of a Failing Fuel Pump Relay in the TIPM

The symptoms of a bad fuel pump relay inside the TIPM can mimic a failing fuel pump, so you need to diagnose carefully. Here are the most common signs:

1. No fuel pump prime noise. When you turn the key to the ON position (without cranking), you should hear a brief whirring sound from the fuel tank for about two seconds. If you hear nothing, the relay may not be sending power to the pump.

2. Engine cranks but will not start. This is the classic symptom. The starter turns over fine, but the engine never fires because there is no fuel pressure.

3. Intermittent stalling. The truck may run fine for a while, then suddenly lose power and stall. After waiting a few minutes, it may restart and run again. This often points to an intermittent relay contact failure.

4. Hard starting after sitting. If the fuel pump loses prime due to the relay cutting power intermittently, you may need to crank the engine several times before it starts.

5. No check engine light or fuel pressure code. In many cases, the PCM does not store a code for a relay failure, because the relay is before the PCM's direct control loop. This makes diagnosis harder without a fuel pressure gauge.

6. Unexplained battery drainage. If the relay is stuck in the "on" position, the fuel pump may run continuously, draining your battery overnight.

How to Test the Fuel Pump Relay Circuit Before Replacing Parts

Before you tear into the TIPM or buy a new fuel pump, follow this systematic approach:

Step 1: Check the fuel pump fuse first. Locate the fuel pump fuse in the TIPM fuse map (usually a 20-amp fuse). Pull it and check for continuity with a multimeter or simply look for a blown element. Replace if blown, but also investigate why it blew.

Step 2: Listen for the pump prime. Turn the key to ON and listen near the fuel tank. If you hear the pump run, the relay is likely working and the problem may be elsewhere (fuel filter, pump pressure, etc.).

Step 3: Test for power at the fuel pump connector. You can access the fuel pump electrical connector under the vehicle near the tank. With the key ON, you should see battery voltage (12V+) for a few seconds at the pump connector. If you have voltage but the pump does not run, the pump is bad. If you have no voltage, the relay or wiring is the issue.

Step 4: Measure fuel pressure. Attach a fuel pressure gauge to the Schrader valve on the fuel rail. With the key ON, pressure should climb to around 50–58 psi (for gasoline engines) and hold. If pressure is zero or very low, suspect the relay or the pump.

Step 5: Jumper test the relay circuit. You can temporarily bypass the relay to confirm the problem. In the fuse box, find the contacts for the fuel pump relay. With the key ON, use a jumper wire to bridge the power feed to the fuel pump circuit. If the pump runs and the truck starts, you have confirmed the relay circuit is the problem.

Step 6: Check voltage at the M25 fuse while cranking. While cranking the engine, have someone measure voltage on the M25 fuel pump fuse in the TIPM. If the fuse does not have a constant 12V while cranking, the fuel pump relay has failed.

What to Do If the Relay Is Bad: Your Three Options

If you confirm the relay is the culprit, you have three main approaches. The table below compares them:

Option 1: Temporary Bypass Cable Using Fuse Taps

This is the quickest way to get your vehicle running again, but it should only be used as a temporary fix. The bypass cable takes power from an alternate fuse slot (M37 or F90/F91) and feeds it directly to the fuel pump fuse slot (M25 or F70), bypassing the faulty relay.

What you need: Two 20 amp ATM fuse taps, one 20 amp fuse (for the M37 side), wire connectors, and heat shrink tubing or electrical tape.

Important warnings:

• Do not use this as a permanent fix. The fuse tap connections can become loose over time, and bad connections have been known to cause fires.
• Only use the M37 slot for bypass mode, as it only powers the fuel pump when the engine is running or being started.
• Remote start may not work with this cable installed.
• Monitor the cable for heat. If the wire feels hot to the touch, the cable or connections may be overloaded.

Option 2: Permanent External Relay Bypass

This is the most reliable long-term fix recommended by mechanics and factory service bulletins. A bypass solves this by taking the fuel pump circuit out of the TIPM entirely, using a standard external automotive relay and fuse instead. This gives you a reliable, easily replaceable setup that costs a fraction of a new TIPM.

Parts you will need:

• External relay package – A standard Bosch-style or Mopar relay, part number 68142156AC works well for this application
• 30A fuse and fuse holder – Use a weather-sealed inline fuse holder rated for the current draw
• 14-gauge wire – At least a few feet, preferably in a color that matches the factory wiring for a cleaner look
• 3/8" wiring loom – To protect the new wires from heat and abrasion
• Heat shrink tubing – For waterproof, professional connections
• 14-gauge eye connectors – For the ring terminals that attach to the battery and ground points
• Electrical tape – For wrapping and securing connections

Basic wiring setup:

• Pin 30 (common): Connect to battery positive through the 30A inline fuse
• Pin 87 (normally open): Connect to the fuel pump positive wire (the one that leads to the pump itself)
• Pin 85 (coil): Connect to a switched power source that gets power only when the ignition is ON
• Pin 86 (coil): Connect to ground

Option 3: Plug-in Bypass Module

This is a semi-permanent solution that is easy to install (5–10 minutes) and costs $59–$129. It is a purpose-built module that plugs into the TIPM to bypass the faulty relay circuit.

The Fuel Pump Itself: Is It the Problem?

If the relay checks out fine but the truck still won't start, the fuel pump itself is a common failure point on these trucks, especially ones with over 100,000 miles. Here is what to check after ruling out the relay:

1. Check the fuel pressure first. Use a fuel pressure gauge on the Schrader valve on the fuel rail. The correct fuel pressure for a 2012 Ram 1500 5.7L should be around 50–58 psi with the key ON.

2. Test the pump directly. If you have voltage at the pump connector but the pump does not run, the pump motor itself has failed.

3. Listen for the pump. If you hear the pump running continuously even with the key off, the relay contacts inside the TIPM may be welded shut. This is different from a no-start condition and points to a different failure mode.

Recommended: KEMSO Fuel Pumps for Your Dodge Ram

When it comes time to replace the fuel pump itself—whether it failed on its own or you simply want a reliable upgrade—KEMSO offers high-performance fuel pumps that are direct OEM replacements. KEMSO fuel pumps are built to meet or exceed factory specifications, ensuring proper fuel pressure and flow for your 5.7L HEMI. Every KEMSO fuel pump comes with a lifetime warranty, giving you peace of mind that you won't have to deal with this problem again. Whether you need a pump for your Ram 1500, a BMW adventure bike, a Kawasaki Jet Ski, a Subaru Impreza, or a Honda Civic Del Sol, KEMSO has you covered with a wide range of applications. Visit https://www.kemsoracing.com/ to find the correct fuel pump for your vehicle and take advantage of their lifetime warranty on every purchase.

Final Thoughts

Dealing with a crank-no-start condition on your 2012 Dodge Ram 1500 5.7 can be frustrating, but the fuel pump relay inside the TIPM is a known weak point with a proven fix. Start with the simple tests—check the fuse, listen for the prime, measure voltage at the pump—and work your way through the diagnostic steps. If the relay is indeed the problem, a permanent external relay bypass will save you hundreds of dollars compared to a full TIPM replacement. And if the pump itself has given up, look for a KEMSO replacement with a lifetime warranty at https://www.kemsoracing.com/ to get your truck back on the road reliably.