2009 Chevy Malibu Fuel Pump Relay: Complete Diagnosis, Location, and Replacement Guide
The bottom line: If your 2009 Chevy Malibu starts and then stalls, or cranks but won't fire up at all, the fuel pump relay is one of the first things to check. This small electrical component—located in the rear fuse block inside the trunk—controls power to the fuel pump, and a faulty relay can cause intermittent stalling, no-start conditions, or a car that dies while driving. The good news is that diagnosing and replacing the relay is one of the cheapest and easiest repairs you can do yourself, often costing less than $15 for the part and taking under 30 minutes to complete. Before you pay a shop hundreds of dollars to replace a fuel pump, rule out the relay first.
This guide walks you through everything you need to know about the fuel pump relay on the 2009 Chevy Malibu: where it's located, how to test it, common symptoms of failure, how to replace it, and when the problem goes beyond the relay to the fuel pump itself.
What Does the Fuel Pump Relay Do?
The fuel pump relay acts like a switch that sends battery power to the fuel pump when you turn the ignition on. Here's how the system works on your 2009 Malibu :
- When you turn the key to the ON position, the engine control module (ECM) energizes the fuel pump relay.
- The relay closes, allowing current to flow to the fuel pump inside the gas tank.
- The fuel pump pressurizes the fuel system to 50-60 psi, which is the specification for your vehicle .
- If the ECM doesn't detect engine rotation (ignition reference pulses) within about 2 seconds, it shuts the relay off to prevent the pump from running continuously .
- Once the engine is running, the ECM keeps the relay energized as long as it detects the engine spinning.
Because the relay is the gateway for power to the pump, any failure in the relay means the pump won't run, and the engine won't start or will stall.
Where Is the Fuel Pump Relay on a 2009 Chevy Malibu?
The fuel pump relay is located in the rear fuse block on the driver's side of the trunk . To access it:
- Open the trunk.
- Look on the left (driver's) side rear quarter panel.
- Remove the access panel covering the fuse block—it may be held on by clips or a small screw.
- The fuel pump relay is typically relay position #37 .
- The fuel pump fuse is position #25 in the same block .
Some sources also describe the rear fuse block as being behind a panel in the trunk area. If you have an owner's manual, it will show the exact fuse and relay map for the rear fuse block.
Symptoms of a Failing Fuel Pump Relay
A bad fuel pump relay can cause several distinct problems. Here are the most common symptoms:
1. Engine Starts Then Stalls
This matches the scenario described by many owners: the car starts fine, runs for a few seconds, then dies. The relay is failing to keep the circuit closed, cutting power to the pump after initial startup .
2. Intermittent No-Start
The engine cranks but won't start, as if it's out of gas. After sitting for a while, it may start again. This happens when the relay contacts fail intermittently .
3. Car Dies While Driving
Loss of power while driving, sometimes for a few seconds, then recovers. Other times the car shuts off completely and won't restart for several minutes .
4. No Fuel Pump Priming Sound
When you turn the key to ON, you should hear a brief hum from the rear of the car as the pump pressurizes. If you hear nothing, the relay may not be sending power to the pump .
5. Check Engine Light with Relay Codes
You may see a P0230 code (fuel pump relay control circuit fault) stored in the ECM .
How to Test the Fuel Pump Relay
There are several ways to test whether the relay is your problem:
Method 1: Listen for the Pump Prime
Turn the key to the ON position (without cranking). Listen near the rear seat. You should hear the pump run for 2-3 seconds. If you don't hear anything, check the fuse and relay first .
Method 2: Swap the Relay
The simplest test: swap the fuel pump relay with a known-good relay of the same part number in the fuse block. Many Malibu relays are identical (such as the fog lamp or horn relay). If the car starts and runs after the swap, you've found the problem .
Method 3: Test with a Multimeter
Remove the relay and test the coil resistance between terminals 85 and 86. The specification is 70-110 ohms . If it reads outside this range or shows an open circuit, the relay coil is bad and the relay needs replacement.
Method 4: Check for Voltage and Ground
With the relay removed:
- Turn the ignition ON.
- Verify you have battery voltage at terminal 30 (the B+ input).
- Verify the ground circuit at terminal 85 is good .
Method 5: Use a Scan Tool
If you have a scan tool with bi-directional controls, you can command the fuel pump relay ON and OFF while watching the control circuit status parameters. The ECM will report if the circuit is open, shorted, or functioning .
Common Causes of Fuel Pump Relay Failure
1. Heat Damage
One owner reported that the relay box in the trunk gets hot enough to crack the metal strip on the circuit board, creating a short. The relay circuit board itself had heat damage, and the wiring was heat-damaged as well .
2. Electrical Shorts
An intermittent short to ground in the fuel pump supply circuit can cause the fuse to open, which kills the relay's output. This could be caused by worn wiring, a damaged connector, or an internal fault in the fuel pump .
3. Age and Wear
Like any electrical component, relays wear out over time. The contacts inside degrade from arcing, and the coil can open. It's a maintenance item that's cheap to replace proactively.
4. Faulty ECM
In rare cases, the ECM itself may fail to command the relay on. But this is less common than relay failure itself. The diagnostic procedure involves checking whether the ECM's control circuit is shorted or open .
Step-by-Step Replacement Guide
Replacing the fuel pump relay is one of the simplest repairs on the 2009 Malibu. Here's how to do it:
Tools needed: A small flathead screwdriver or trim tool, and a new relay.
- Open the trunk and locate the rear fuse block on the driver's side .
- Remove the access panel covering the fuse block.
- Identify relay #37 . If the relay has a clear plastic case, you may be able to see the coil and contacts.
- Pull the relay straight out using a relay puller or a small screwdriver. Some owners use needle-nose pliers, but be careful not to damage the fuse block.
- Compare the old relay to the new one. They should look identical and have the same part number.
- Push the new relay in until it clicks securely.
- Test the car by turning the ignition to ON. You should hear the fuel pump prime. Then start the engine.
- Replace the access panel.
The entire process takes about 10 minutes. The relay part itself is inexpensive, with OEM part number 13500126 available for around $11.65 . A genuine GM relay can be purchased for less than $8 .
Fuel Pump Relay Fuse Location
The fuel pump fuse is located in the same rear fuse block as the relay. It's fuse #25 . If the relay tests fine but the pump still doesn't run, check this fuse first. A blown fuse will prevent power from reaching the relay's switch contacts.
You should also check any other fuses related to the ECM and fuel system if the relay isn't functioning.
When the Problem Isn't the Relay: Fuel Pump Diagnosis
If you've replaced the relay, checked the fuse, and the car still stalls or won't start, the problem likely lies elsewhere. Here's how to move forward.
Check Fuel Pressure
Install a fuel pressure gauge on the fuel rail test port. The specification for the 2009 Malibu is 50-60 psi with the key ON, engine OFF . Pressure should not drop more than 5 psi in one minute after the pump shuts off .
- If pressure is too low (below 50 psi), the pump may be weak, the fuel filter clogged, or there's a restriction in the feed line .
- If pressure drops quickly, the check valve inside the pump module is leaking, which extends cranking time and can cause hot-start problems .
Listen to the Fuel Pump
If the relay is new and the fuse is good, but you still hear nothing from the rear of the car, the pump motor itself may be dead. Test for 12 volts at the pump connector when the key is turned to ON. If voltage is present but the pump doesn't run, the pump needs replacement .
Inspect Wiring and Grounds
Corroded connectors, damaged wiring, or poor grounds can mimic pump failure. Check the harness near the fuel tank and under the car for chafing or corrosion .
Avoid Replacing Parts Blindly
Many owners have reported that dealerships couldn't duplicate the problem and returned the car without a fix . If you have a scan tool, read the codes and check live data for fuel pressure and pump command. This saves you from guessing.
Fuel Filter: A Preventive Measure
The 2009 Malibu has the fuel filter inside the fuel pump assembly in the tank . There's no external, replaceable filter. Some owners recommend replacing the fuel filter or the entire pump assembly every 30,000 miles to prevent fuel pump failure . In practice, that means the "strainer" (sock) on the pump can become clogged, restricting fuel flow and causing the same stalling symptoms.
If you're experiencing intermittent stalling, replacing the fuel pump assembly (which includes a new strainer and often a new relay) may be the permanent fix.
Cost of Fuel Pump Relay Replacement
This is one of the most budget-friendly repairs you can make:
- Relay part cost: $8 to $15 for an OEM relay .
- Labor cost (if you pay a shop): Usually 15-30 minutes of shop time, around $50-75.
- Total with a mechanic: Likely under $100.
By comparison, a full fuel pump replacement costs on average $611-$894 , so confirming the relay is good before replacing the pump can save you hundreds.
Frequently Asked Questions
Does the 2009 Malibu have a fuel pump reset switch?
No. The Chevy Malibu does not have a fuel pump reset button or inertia switch as standard equipment . If you've had a collision, the pump shuts off through the safety system, but you cannot reset it manually. Some owners report that turning the key to ON for two minutes and then starting helps re-energize the system, but that's not a reset switch—it's just allowing the pump time to prime .
If I replaced the relay and it starts for a while, then dies again, what's next?
Check fuel pressure while the car is running. If pressure drops, the pump is likely failing. A clogged strainer or internal pump wear can cause the exact "start then stall" symptom.
Can a bad relay damage the fuel pump?
Yes. If the relay contacts are arcing or if the pump runs intermittently without proper voltage, the pump motor can overheat and fail prematurely. This is why replacing the relay early is critical.
How long should a fuel pump relay last?
There's no set service interval. Relays typically last for many years, but heat and electrical stress can shorten their life. If you own a Malibu with high mileage (over 100,000 miles), it's a good idea to proactively replace the relay .
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Final Thoughts
The 2009 Chevy Malibu fuel pump relay is a small part, but it can cause big headaches if it fails. Stalling, hard starts, and no-start conditions are all classic symptoms. Start your diagnosis with the relay and fuse—they're cheap, easy to test, and easy to replace. If those check out, move to fuel pressure testing to determine if the pump itself is the culprit.
By following the steps in this guide, you'll avoid unnecessary repairs and save money. And if the pump does need replacement, a quality part from KEMSO will get your Malibu running reliably again.
For more fuel pump guides and high-quality replacement parts, visit https://www.kemsoracing.com/.