2008 GMC Fuel Pump Control Module: Symptoms, Replacement, and What You Need to Know

The bottom line up front: If you drive a 2008 GMC Sierra, Yukon, or other GM truck and SUV from the 2007–2009 generation, the fuel pump control module is a common failure point that can cause stalling, no-start conditions, and erratic fuel delivery. This module—often called the fuel pump driver module (FPDM)—controls the speed and pressure of the electric fuel pump, and when it fails, your engine simply won't get the fuel it needs to run properly. The good news: you can replace it yourself with basic hand tools, and a quality aftermarket unit will restore reliable performance without dealership pricing. Below, we break down everything you need to know about the 2008 GMC fuel pump control module, including where it sits, how to diagnose it, and which replacement options actually hold up.

What Is the Fuel Pump Control Module and Why Does It Fail?

The fuel pump control module is a small electronic box that regulates voltage to the fuel pump. On 2007–2009 GM trucks and SUVs, this module is part of a smart fuel system that adjusts pump speed based on demand. When you start the engine, the module receives a signal from the powertrain control module (PCM) and sends the right amount of power to the fuel pump. This design improves fuel efficiency and reduces pump wear compared to older constant-speed systems.

However, the module sits in a harsh environment. It is mounted to the frame near the rear of the vehicle on many models, which means it gets exposed to road salt, mud, water splash, and extreme temperature changes. Over time, the circuit board inside the module can develop cracked solder joints or corroded connectors. Moisture intrusion is a leading cause of failure, as the module's housing is not always perfectly sealed. On 2008 GMC Sierra and similar trucks, these failures are well documented among owners.

Once the module fails, the fuel pump may run at full speed constantly, run intermittently, or not run at all. Each scenario produces distinct symptoms, and the next section explains what to watch for.

Symptoms of a Failing 2008 GMC Fuel Pump Control Module

The symptoms of a bad fuel pump control module on a 2008 GMC truck or SUV often mimic a failing fuel pump itself. This is why many owners replace the pump first, only to discover the module was the culprit. Knowing the difference can save you time and money.

1. Intermittent no-start or crank-no-start condition. The most common complaint is that the truck will start fine for days, then suddenly refuse to start. The engine cranks strongly but will not fire up. This happens because the module sends no power to the fuel pump at all. After waiting 10–30 minutes, the truck may start again as the module cools or the connection re-seats itself. This intermittent behavior is a classic sign of a failing module rather than a dead pump.

2. Engine stalls while driving and then restarts. You can be cruising down the highway and the engine suddenly dies as if you turned off the key. You pull over, wait a few minutes, and it restarts. This symptom points to the module overheating or losing signal during operation. On 2008 GMC Sierra models, owners report this happening at highway speeds, which is dangerous and should be addressed immediately.

3. Fuel pump runs constantly and is loud. A working module pulses the pump at variable speeds. When the module fails, it may default to sending full battery voltage to the pump. You will hear a loud whining noise coming from the fuel tank area, especially at idle or after turning the ignition to "on" without starting the engine. The pump may run continuously even when it shouldn't.

4. Check Engine Light with fuel system codes. The PCM monitors the fuel pump circuit. When the module loses communication or the fuel pressure drops outside the expected range, the computer sets diagnostic trouble codes. Common codes include P0230 (fuel pump primary circuit malfunction) and P0641 or P0645 (reference voltage faults). If you scan your 2008 GMC and see these codes, the module is likely the source.

5. Hard starting after the truck sits hot. Another reported symptom is that the engine cranks for a long time before firing up, especially when hot. The circuit board inside the module expands when hot and loses contact internally. Once the module cools down, the truck starts again. This symptom is more noticeable in summer or after long drives.

Because these symptoms overlap with a weak fuel pump or a clogged fuel filter, you should confirm the diagnosis before buying parts. The next section explains how.

How to Diagnose the 2008 GMC Fuel Pump Control Module

Diagnosing the module on a 2008 GMC fuel pump control module system takes about 30 minutes with a digital multimeter. No special factory tools are required. Follow these steps in order, and you will know whether the module or the pump is at fault.

Step 1: Check fuel pressure at the rail. Use a fuel pressure gauge connected to the Schrader valve on the fuel rail. With the ignition on (engine off), pressure should rise to the specified range (typically 55–62 psi for this generation). If pressure is zero or very low, you suspect a pump or module issue. If pressure is normal, the pump and module are likely fine, and the problem lies elsewhere.

Step 2: Listen for the pump prime. Turn the ignition to "on" without cranking the engine. You should hear the fuel pump run for about 2–3 seconds. If you hear nothing, check the fuse and relay first. If those are good, the module is not sending power to the pump.

Step 3: Test the module connector. Locate the fuel pump control module. On most 2008 GMC Sierra 1500 and Yukon models, it is mounted on the frame rail near the rear axle or inside the spare tire area. Disconnect the electrical connector and inspect it for green corrosion, bent pins, or signs of overheating. Then, with a multimeter, check for battery voltage at the power pin and ground continuity. If power and ground are present but the pump does not run, the module is suspect.

Step 4: Bypass the module temporarily. Unplug the module and use a jumper wire to send battery voltage directly to the fuel pump connector. If the pump runs with direct power, the module is confirmed bad. If the pump still doesn't run, the pump itself may be dead.

Step 5: Check for wiring damage. The harness from the module to the pump can rub against the frame and short out. Visually inspect the wires along the frame rail for bare spots or chafing. Repair any damaged wiring before installing a new module.

A note on programming: Many replacement modules for 2007–2009 GM vehicles require programming to the vehicle's VIN. This is because the PCM and module communicate over a serial data network, and some modules must match the vehicle. However, some aftermarket modules come pre-programmed and plug-and-play, which simplifies the job. We cover this distinction in the replacement section below.

2008 GMC Fuel Pump Control Module Location: Where to Look

The exact location of the fuel pump control module on a 2008 GMC depends on the model and trim. GM placed the module in slightly different spots across its truck and SUV lineup, so check the following locations on your vehicle.

1. Frame rail above or behind the spare tire. On many 2008 GMC Yukon and Yukon XL models, the module bolts to the rear frame crossmember, just above the spare tire. You may need to lower the spare tire to access it. The module is a small rectangular black box with a multi-pin connector.

2. Inside the cargo area behind a trim panel. Some 2008 GMC Sierra models have the module mounted inside the cabin, behind the rear seat or in the cargo area. On the Sierra Crew Cab, you may need to fold the rear seat forward to access it. Check your owner's manual if you are not sure.

3. On the frame, in front of the rear axle, driver's side. Another common spot for GM trucks is under the driver's side, ahead of the rear axle, mounted to the frame with a metal bracket. This location is accessible from underneath without removing any wheels or panels.

4. Under the rear bumper, near the trailer hitch. A few models place the module in a protective bracket under the rear bumper. This location is common on 2008 GMC Silverado (Chevy) and Sierra 2500/3500 trucks. Follow the fuel pump wires from the tank, and they will lead you to the module.

When in doubt, crawl under the truck and follow the wiring harness from the fuel tank. The harness runs toward the module, which has a distinctly different shape than the fuel tank or pump. It is the only small electronic box along that wiring path, and it will have 4–6 wires coming out of one end.

Replacing the 2008 GMC Fuel Pump Control Module: Step-by-Step

Replacing the fuel pump control module on a 2008 GMC is a DIY-friendly job that most owners can complete in under an hour. You will need a socket set, a flathead screwdriver, and possibly a T40 Torx bit on some models. Before you start, disconnect the negative battery cable and relieve fuel system pressure by removing the fuel pump fuse and letting the engine run until it stalls.

Tools and parts you need:

• New fuel pump control module (OEM or aftermarket, programmed if required)
• Socket set with extensions (10mm, 13mm, and T40 Torx)
• Flathead screwdriver and trim removal tool
• Dielectric grease for the connector
• Zip ties for harness routing (replace any damaged straps)

Step 1: Gain access to the module. Depending on location, either lower the spare tire, fold the rear seat, or raise the truck on jack stands. On models where the module is above the spare tire, lower the spare tire and you will see the module mounted to the crossmember.

Step 2: Disconnect the electrical connector. Press the release tab on the connector and pull it straight off the module. Inspect the connector for corrosion or bent pins. If you see green corrosion, clean it with electrical contact cleaner and apply dielectric grease before plugging in the new module.

Step 3: Remove the mounting screws or bolts. Most modules use two 10mm bolts or Torx screws. Remove them and pull the old module free. Take note of the mounting orientation—the new module must sit the same way. Some modules have a grounding tab that must touch the frame for proper operation.

Step 4: Install the new module. Bolt the new module into place and tighten the screws snugly. Do not overtighten, as the module housing is plastic on many aftermarket units. Connect the electrical connector until you hear it click. Verify that the locking tab is fully engaged.

Step 5: Reconnect the battery and test. Reconnect the negative battery cable, turn the ignition to "on," and listen for the fuel pump prime. If you hear a smooth 2–3 second whir from the tank, the module is working. Then start the engine and let it idle for a few minutes. Check for leaks or warning lights.

Step 6: Clear codes and verify driveability. If you had diagnostic trouble codes, clear them with a scan tool. Take the truck for a test drive. The engine should start immediately, idle smoothly, and maintain power under load. Watch for any recurrence of the original symptoms.

Programming notes: If your replacement module is an aftermarket unit pre-programmed to your VIN, installation is plug-and-play. If you bought an OEM module from a dealer that is blank, you will need a bidirectional scan tool that can access the fuel pump control module programming routine. This feature requires a high-end scan tool such as a Tech 2, Autel, or Snap-on. If you don't have one, choose a supplier that offers VIN-matched programming before shipping.

Replacement Options and Part Numbers for the 2008 GMC

When you shop for a fuel pump control module for a 2008 GMC, you will encounter several part numbers and both OEM and aftermarket options. Knowing which part fits your exact truck is essential, because GM used two different connectors and mounting styles across the 2007–2009 production.

Original GM part numbers to look for:

• 20850907: This is one of the most common part numbers for the fuel pump control module on 2007–2009 GM 1500 trucks and SUVs, including the 2008 GMC Sierra and Yukon.
• 13501024: Another widely used OEM number, this one appears on later production 2008–2009 models and some Sierra Denali trims.
• 25866052: This number shows up on 2008–2009 GM trucks and is a newer superseding part that replaces older versions.
• 15213110: Used specifically on 2008–2009 GMC Yukon models, this is a common OE reference.

Aftermarket options:

• Dorman 601-132: Dorman offers a direct-fit replacement that is a popular choice among owners. It is sold as a plug-and-play unit, but confirm whether it ships with VIN programming included. Many owners use this as a budget-friendly alternative to the OEM part.
• Pre-programmed aftermarket modules: Several online retailers, including Highway71 Auto Parts and Diesel ACS, sell modules pre-programmed to your VIN. You send them your VIN when ordering, and they program the module before shipping. This is the easiest route for DIY owners without a factory scan tool.

Before ordering, check the connector shape in the product photos against your old module. If they look different, contact the seller to confirm fitment. Matching the part number printed on your old module is the safest approach, as you can cross-reference the number online without guessing.

Cost Considerations and Should You DIY or Hire a Mechanic

Replacing the fuel pump control module on a 2008 GMC is one of the least expensive fuel system repairs you can do. The module itself is far cheaper than a complete fuel pump assembly, which is a good reason to diagnose carefully before throwing parts at the problem.

Module cost: Aftermarket modules range from roughly $60 to $150 depending on whether they come pre-programmed. OEM modules from a GM dealer run higher, often $200–$300 for the part alone.

Labor cost: If you hire a shop, expect 0.5 to 1.0 hours of labor. At typical shop rates of $100–$150 per hour, total cost will be $160–$300 including parts. That is a reasonable price for restoring reliability, but doing it yourself cuts the cost to just the module price, which saves you significant money.

DIY difficulty rating: We rate this job a 3 out of 10 for difficulty. The hardest part is finding the module on your specific model. Once located, it is simply two bolts and one connector. No heavy lifting, no specialty tools, and no fluid handling. This is a great weekend project for the home mechanic.

Potential additional costs: If your old module failed because of moisture ingress, check the wiring harness for damage. A shorted wire can kill a new module. If you find chafed wires, repair them with solder and heat shrink before installing the new unit. Add about $10 for wiring supplies if needed.

When to call a professional: If your truck has an aftermarket alarm system, remote start, or modified fuel system, the module may be receiving signals from non-factory components. In this case, diagnosis becomes more complex, and a shop with factory-level scan tools may be necessary. Also, if you lack confidence working around fuel systems, having a mechanic handle it is a valid choice.

Preventing Future Fuel Pump Module Failures

Once you replace the module on your 2008 GMC fuel pump control module system, you should protect it from the same conditions that killed the original. A few simple steps can greatly extend the life of the new unit.

1. Seal the connector properly. Apply dielectric grease to the connector pins before plugging it in. This prevents moisture from entering the connector and wicking up into the module.

2. Inspect the module's mounting location for water intrusion. If the original module was mounted in a low spot where water pools, consider adding a small rubber shield or repositioning the module within its factory mounting holes. Some owners place a piece of rubber sheet between the module and frame to reduce road splash exposure.

3. Keep the frame area clean. When you wash your truck or drive on salted roads, the area around the module collects mud and salt. Rinse this area regularly with a hose to reduce corrosion risk. On 2008 GMC Sierra trucks, this routine maintenance is worth doing every few months.

4. Check the wiring harness straps. The factory zip ties that secure the harness can break over time, allowing wiring to rub against the frame. Inspect them during oil changes and replace any broken straps.

5. Address fuel pump issues early. A failing fuel pump can draw excessive current, which stresses the module. If you notice a loud pump or weak fuel pressure, replace the pump before it damages the module.

KEMSO Fuel Pump: A Reliable Upgrade for Your 2008 GMC

When you are addressing fuel delivery issues on your 2008 GMC, the fuel pump itself is just as critical as the control module. If a bad module overworked the pump, you may need to replace both. This is where KEMSO stands out as a strong choice.

KEMSO offers aftermarket fuel pumps engineered as high-performance, OEM replacement parts for a wide range of vehicles, including trucks, SUVs, cars, motorcycles, ATVs, and UTVs. Their fuel pumps are designed to meet or exceed original equipment specifications, giving you reliable fuel delivery under all driving conditions. Whether you drive a GMC Sierra, a Silverado, or any other vehicle, KEMSO has a pump that fits tight and delivers consistent pressure.

What sets KEMSO apart is the confidence they back into their products. Every KEMSO fuel pump comes with a lifetime warranty, which means you only buy once and do not worry about repeat failures. That warranty is a direct reflection of their build quality and reliability. Combined with their competitive pricing, KEMSO gives you a strong value proposition over dealership parts.

If you need a replacement fuel pump for your 2008 GMC, or any other vehicle, visit the KEMSO website to browse their full lineup:

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From popular truck pumps to motorcycle and ATV applications, KEMSO carries the right part. Their catalog includes fuel pumps for BMW motorcycles, Kawasaki watercraft, Subaru cars, Can-Am ATVs, and many more. You can find the exact fit, order with confidence, and get back on the road with a part that is built to last.

Final Thoughts on the 2008 GMC Fuel Pump Control Module

The 2008 GMC fuel pump control module is a component that you cannot afford to ignore when symptoms appear. Whether your truck stalls on the highway, refuses to start in the driveway, or simply sounds louder than usual, a failing module is often the root cause. The good news is that diagnosing the problem is straightforward, and replacing the module is one of the easier DIY repairs on this truck generation.

Remember these key points:

1. A bad module mimics a bad pump. Check pressure and power flow before buying any parts.
2. The module location varies by model. Look above the spare tire, behind the rear seat, or under the bumper for your 2008 GMC Sierra or Yukon.
3. Some modules need VIN programming. Buy a pre-programmed unit to avoid needing a factory scan tool.
4. Use dielectric grease and secure wiring to prevent repeat failures.
5. Pair a new module with a quality pump. KEMSO fuel pumps deliver reliable performance and come with a lifetime warranty, making them an excellent choice for your replacement needs.

Address the issue early, and your truck will run faithfully for many more years. If you need a fuel pump, check out KEMSO at https://www.kemsoracing.com/ for a durable, high-performance part backed by a lifetime warranty.

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