2012 Jeep Grand Cherokee Fuel Pump Relay Location: A Complete Troubleshooting Guide

If your 2012 Jeep Grand Cherokee cranks but won't start, the fuel pump relay is often the first component to check. The fuel pump relay on a 2012 Jeep Grand Cherokee is located inside the Power Distribution Center (PDC) under the hood, near the battery on the driver's side. Open the hood, locate the black fuse box next to the battery, remove the cover, and look for the relay labeled "FUEL PUMP" on the diagram printed inside the lid. However, many of these vehicles were part of a major safety recall, and an external fuel pump relay may have been installed near the front of the engine bay, which changes where you need to look. This guide walks you through everything you need to know to find, test, and replace the fuel pump relay on your 2012 Grand Cherokee.

Understanding the Fuel Pump Relay and Its Function

The fuel pump relay is an electrical switch that controls power to the fuel pump. When you turn the ignition key, the engine control unit (ECU) sends a signal to the relay, which closes the circuit and allows power to flow to the fuel pump. The fuel pump then draws fuel from the tank and delivers it to the engine at the correct pressure. Without a working relay, the fuel pump gets no power, and the engine won't start. Think of it as a gatekeeper that makes sure the fuel pump only runs when the engine needs it.

The 2012 Jeep Grand Cherokee uses a Totally Integrated Power Module (TIPM), which houses many of the vehicle's relays and fuses. The fuel pump relay is one of several internal relays soldered onto the circuit board inside the TIPM. This design makes the relay difficult to replace on your own, which is why Chrysler developed a recall solution involving an external relay.

Where to Find the Fuel Pump Relay: Two Possible Locations

Because of a recall, your 2012 Grand Cherokee may have the fuel pump relay in one of two places. Here is how to check both.

Location 1: Inside the TIPM (Factory Location)

Start by opening the driver's side door and find the hood release button in the left corner. Go outside, lift the hood, and release the safety latch. Look for the black fuse box (the TIPM) next to the battery on the left side of the engine bay. Remove the fuse box cover. On the underside of the cover, you will see a diagram that labels the position of the fuel pump relay. The relay is a small, rectangular component inside the relay panel. In the factory configuration, this is where the fuel pump relay lives.

Location 2: External Relay (After Recall Installation)

If your vehicle was part of Safety Recall V62 (NHTSA 19V-813), a dealer may have installed an external fuel pump relay. This recall affected approximately 582,000 2011-2013 Jeep Grand Cherokee and Dodge Durango vehicles. The fix was to install an external relay mounted on a bracket near the Powertrain Control Module (PCM), typically located on the passenger side of the engine bay, close to the front headlight. To check, open the fuse box lid and look for a second smaller wire (usually red or orange) under the large hex nut that holds the positive battery connection. If you see this wire, follow it outside the TIPM. It should lead to an inline fuse and then to a small black relay box, often made by Omron, mounted within 1-2 feet of the fuse box. The relay usually has "Omron" printed on top in white letters.

Common Symptoms of a Failing Fuel Pump Relay

A failing fuel pump relay can cause several problems. Recognizing these symptoms early can save you from being stranded.

  1. No-Start Condition: The engine cranks normally but never fires up. This is the most common symptom. If the fuel pump isn't getting power, no fuel reaches the injectors.
  2. Intermittent Starting Problems: The vehicle starts fine sometimes but refuses to start other times. This often happens when the engine is hot, as heat can cause a failing relay to act up.
  3. Engine Stalling While Driving: The engine may suddenly die while you are driving, especially under load or when going uphill. This is dangerous and should be addressed immediately.
  4. No Fuel Pump Priming Sound: When you turn the key to the "on" position (before cranking), you should hear a brief hum from the fuel pump for about 2-3 seconds. If you don't hear this sound, the relay may be the issue.
  5. Battery Drainage: A stuck relay can cause the fuel pump to run continuously, even when the engine is off, slowly draining your battery.

How to Test the Fuel Pump Relay

Before replacing parts, you should confirm the relay is the problem. Here are four simple diagnostic steps.

Step 1: Listen for the Fuel Pump

Turn the key to the "on" position (do not crank the engine). Listen for a humming sound from the rear of the vehicle, near the fuel tank. If you hear nothing, the fuel pump is not getting power. This could be the relay, a fuse, or the pump itself.

Step 2: Swap the Relay

If you have the factory internal relay, find an identical relay in the TIPM (such as the horn relay). Swap them. If the starting problem disappears, you have confirmed the relay is faulty. This is the easiest test for most DIYers.

Step 3: Check for the External Relay

If you have an external relay installed, you can test it by tapping it lightly with a screwdriver handle while someone tries to start the vehicle. Sometimes a stuck relay will free up with a tap. If the vehicle starts, the relay is failing and needs replacement.

Step 4: Voltage Test

If you have a multimeter, you can check for voltage at the relay terminals. You will need a wiring diagram for your specific model to identify the correct terminals. The standard relay terminals are numbered 30 (constant power), 87 (switched power to the fuel pump), and 85/86 (ground and control circuit).

Safety Recall V62: What You Need to Know

Chrysler issued Safety Recall V62 (NHTSA 19V-813) for 2011-2013 Jeep Grand Cherokee and Dodge Durango vehicles. The recall addressed a problem where silicon contamination could cause the fuel pump relay contacts to fail. This failure could result in a no-start condition or an engine stall while driving, which could cause a crash without prior warning.

The recall remedy involved inspecting for an existing external relay. If no external relay was present, the dealer would modify the TIPM to accept an external relay by cutting three wires (pink, brown, and blue) and splicing in a new harness with an external relay mounted on a bracket near the PCM. If an external relay was already installed, the dealer would replace it with a new relay and harness connector.

If you are unsure whether your vehicle has had this recall completed, check with your local Jeep dealer using your Vehicle Identification Number (VIN). The repair is free of charge if your vehicle is still covered under the recall.

What to Do If You Have an External Relay and It Fails

If your 2012 Grand Cherokee has the external Omron relay and it starts failing, you have a few options.

Replace the external relay: This is the simplest fix. The Omron G8JN relay is available online and at some auto parts stores. Replacement takes about five minutes: just unplug the old relay and plug in the new one. The relay is attached to the vehicle body with a one-way plastic fastener, which you may need to break and replace with a zip tie or similar.

Bypass the relay temporarily: If you are stuck on the side of the road, you can remove the external relay from the wire harness and use a jumper wire to connect pins 30 and 87 on the harness. This provides full-time power to the fuel pump and will get you home. Do not leave this bypass in place permanently, as it defeats the safety feature that shuts off the fuel pump in a crash.

Reverse the dealer modification: If you prefer to go back to the factory setup, you can reverse the external relay installation by reconnecting the cut wires under the TIPM. This is more involved and requires some electrical knowledge, but it allows you to use other aftermarket solutions.

Fuel Pump Relay Replacement: Step-by-Step

If you determine the relay itself is bad and you want to replace it, here is the general procedure for the internal relay. Note that the internal relay is soldered to the TIPM board, so replacing it requires soldering skills or a rebuilt TIPM.

  1. Disconnect the negative battery cable for safety. On the 2012 Grand Cherokee, the battery is located under the passenger front seat. Move the passenger seat fully forward, open the battery access cover, and disconnect the negative cable.
  2. Locate the fuel pump relay in the TIPM. Refer to the diagram on the underside of the fuse box cover.
  3. If you have an internal relay, you will need to remove the TIPM from the vehicle. Release the four retaining tabs and separate the TIPM from its support bracket. Carefully rotate the TIPM to access the underside of the board where the relay is soldered.
  4. Desolder the old relay and solder in a new one. This requires a soldering iron and some experience with circuit boards. If you are not comfortable with soldering, consider having a professional repair the TIPM or buy a rebuilt unit.
  5. If you have an external relay, simply unplug the old relay and plug in the new one. Ensure the relay is securely seated in the connector.
  6. Reconnect the negative battery cable and test the vehicle.

What Else to Check If the Relay Tests Fine

If the fuel pump relay tests good but your vehicle still won't start, the problem may lie elsewhere.

Check the fuel pump fuse: Before anything else, check the fuse. In the TIPM, fuse M25 (or fuse 70, depending on the configuration) is the external fuse responsible for powering the fuel pump. A blown fuse is a common and easy fix.

Test the fuel pump itself: You can test the fuel pump by applying direct power. Remove the external relay (if installed) and use a jumper wire to connect pins 30 and 87 on the harness. If the pump runs, the relay is the issue. If the pump does not run, the pump itself may be faulty.

Check fuel pressure: A fuel pressure test is the best way to confirm the pump is working. The factory specification for the 2012 Grand Cherokee is typically around 50 psi. If pressure is low, the pump may be failing even if it runs.

Inspect wiring and connectors: Look for corroded, damaged, or loose connections at the TIPM and the fuel pump. On some vehicles, the wiring harness near the fuel tank can chafe or corrode over time.

Check the crankshaft or camshaft sensor: If the ECU does not receive a signal that the engine is cranking, it will not send power to the fuel pump relay. A faulty crankshaft position sensor can mimic a bad relay.

Preventative Maintenance Tips

Fuel pump relays do not require scheduled maintenance, but you can take steps to prevent premature failure.

  • Keep the battery terminals clean and free of corrosion. Dirty connections can cause voltage spikes that damage relays.
  • Avoid running the fuel tank low on gas frequently. The fuel pump relies on fuel for cooling and lubrication. Running low can overheat the pump and stress the relay.
  • If you have an external relay, consider carrying a spare in your glove box. The replacement is quick and can save you from being stranded.
  • If you start experiencing intermittent starting issues, address them promptly. A failing relay can leave you stuck at the worst possible time.

Upgrade Your Fuel System with KEMSO

If you have ruled out the relay and determined that the fuel pump itself needs replacement, you want a part that is reliable, durable, and backed by a solid warranty. That is where KEMSO comes in.

KEMSO Fuel Pump products are high-performance, OEM replacement units designed to meet or exceed the original factory specifications. Every KEMSO fuel pump is built with quality materials and precision engineering to ensure a perfect fit and reliable operation for your 2012 Jeep Grand Cherokee. Whether you drive the V6 or V8 model, KEMSO has a fuel pump that will restore your vehicle's performance and fuel delivery.

What sets KEMSO apart is their lifetime warranty. When you buy a KEMSO fuel pump, you are not just buying a part; you are buying peace of mind. If the pump ever fails, KEMSO stands behind it. This lifetime confidence is backed by their promise to fuel your adventure without worry.

Visit KEMSO today to find the right fuel pump for your 2012 Jeep Grand Cherokee. Browse their selection of high-performance fuel pumps, check out the warranty details, and see why thousands of customers trust KEMSO for their replacement parts. Click here to explore KEMSO Fuel Pump products: https://www.kemsoracing.com/

Final Thoughts

The fuel pump relay on a 2012 Jeep Grand Cherokee is a small component that can cause big problems. Whether your relay is still in the factory location inside the TIPM or has been moved to an external location as part of the recall, knowing where to look and how to test it will save you time and money. Start by listening for the fuel pump when you turn the key. If you hear nothing, check the fuse, then locate and test the relay. If you have an external relay and it fails, replacement is quick and easy. And if the relay is not the issue, move on to testing the fuel pump itself.

For a reliable fuel pump replacement, consider KEMSO. Their OEM-quality pumps with a lifetime warranty provide the dependability you need to keep your Grand Cherokee on the road. Visit https://www.kemsoracing.com/ to learn more and find the perfect fuel pump for your vehicle.


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