2019 Silverado Fuel Pump Control Module: Your Essential Guide to Diagnosis and Replacement

If your 2019 Chevrolet Silverado cranks but stubbornly refuses to start, consistently loses power, or throws frustrating fuel-related check engine lights, a failing fuel pump control module (FPCM) is a prime suspect and requires immediate attention.

This critical electronic component acts as the brain for your truck's fuel delivery system. Located under the vehicle on certain models and potentially inside the cabin on others (like Double Cabs behind the passenger-side kick panel), the 2019 Silverado fuel pump control module governs the precise amount of voltage sent to the actual fuel pump submerged in the tank. Its job is crucial: ensure the fuel rail receives adequate pressure for optimal engine performance at all speeds and loads. When this module malfunctions, it directly impacts the fuel pump's operation, leading to potentially crippling drivability issues or complete immobilization. Don't wait until you're stranded on the highway – understanding the signs, knowing how to verify the problem, and understanding your repair options is essential.

Recognizing the Symptoms of a Failing 2019 Silverado FPCM

Diagnosing the issue begins with being aware of the specific problems a faulty fuel pump control module typically causes in a 2019 Silverado:

  1. Engine Cranks But Won't Start: This is the most common and definitive sign. You turn the key or press the start button, the engine spins over normally, but it simply will not fire up. This happens because the FPCM is failing to power the fuel pump, meaning no gasoline is reaching the engine. It’s distinct from a failed starter motor where you'd hear clicking or nothing at all.
  2. Sudden Engine Stalling During Operation: Your truck might be running fine one moment, then abruptly shut off without warning while driving, idling, or coming to a stop. A completely dead FPCM cuts power to the fuel pump instantly, starving the engine. The truck will usually crank normally afterward but won't restart until the module is replaced or the fault clears temporarily.
  3. Intermittent Starting Problems (Hard Starting): The problem may not be constant at first. You might experience situations where the engine cranks for an unusually long time before finally starting, especially after the truck has been sitting. This points to an FPCM beginning to fail internally, causing inconsistent control signals to the pump.
  4. Loss of Power While Driving (Stumble, Hesitation, Surging): As the FPCM deteriorates, it can send incorrect voltage signals to the pump. This results in fuel pressure that’s too low or fluctuates erratically. You'll feel this as hesitation or jerking under acceleration, a noticeable lack of power especially when trying to pass or climb hills, or even brief, unnerving moments where the engine feels like it's being choked.
  5. Illuminated Malfunction Indicator Lamp (MIL - Check Engine Light): A failing FPCM often triggers diagnostic trouble codes (DTCs) stored in the Silverado's Engine Control Module (ECM). Common codes directly related to the FPCM include:
    • P0627 (Fuel Pump 'A' Control Circuit/Open): Indicates a break or high resistance in the FPCM control circuit.
    • P069E (Fuel Pump Control Module Requested MIL Illumination): A specific GM code commanding the ECM to turn on the Check Engine Light due to a detected problem within the FPCM.
    • P2635 (Fuel Pump 'A' Low Flow/Performance): While this points to insufficient fuel flow, it can be caused by a faulty FPCM not sending the correct signal.
    • P0171 / P0174 (System Too Lean Bank 1/Bank 2): Lean codes indicate not enough fuel. A weak pump signal from a failing FPCM causing low pressure is a possible culprit.
  6. No Fuel Pump Prime Sound: When you first turn the key to the "ON" position (before cranking), you should hear a distinct, brief whirring or humming sound from the rear of the truck lasting 2-3 seconds. This is the fuel pump priming the system. If you hear silence during this initial key-on stage, it strongly suggests a problem with the fuel pump circuit, potentially the FPCM, relay, fuse, or the pump itself.
  7. Complete Failure After Driving Through Water/Heavy Rain: While designed to be weather-resistant, the location of the underbody module can expose it to splash, particularly if splash shields are damaged or missing. Premature failure can occur if water intrusion happens.

Diagnosing the 2019 Silverado Fuel Pump Control Module Problem

Don't just throw parts at the problem. Accurate diagnosis saves time and money:

  1. Scan for Diagnostic Trouble Codes (DTCs): This is step one. Use an OBD-II scan tool capable of reading manufacturer-specific codes (like the GM codes mentioned: P0627, P069E). The presence of these codes strongly points toward the FPCM being the source of trouble.
  2. Basic Electrical Checks - Fuses and Relays:
    • Check the FPCM Fuse(s): Locate your Silverado's underhood fuse box. Consult your owner's manual or the fuse box diagram. The primary fuse responsible for the FPCM circuit is often labeled "FUEL PUMP" or "FPCM." It's frequently a 20-amp fuse. Pull it out and inspect the metal strip inside. If it's broken or discolored, replace it with an identical fuse.
    • Test the Fuel Pump Relay: Locate the fuel pump relay in the same fuse box. While technically responsible for powering the FPCM (which then controls the pump), a faulty relay can mimic module failure. Swap it with a known-good, identical relay (like the horn relay - ensure specs match). If the truck starts, the original relay was faulty. If the problem persists, proceed.
  3. Fuel Pressure Test (Most Critical Step): This is the gold standard test for any fuel system issue, especially suspected FPCM failure. A mechanic will connect a fuel pressure gauge directly to the fuel rail test port (usually near the engine intake manifold). Key test moments:
    • Key-On / Engine-Off (KOEO): Turn ignition ON without starting. You should see pressure rapidly build (typically to spec like 55-65 PSI for direct injection engines) and hold steady for several minutes. No pressure or slow pressure build KOEO points directly to a problem with fuel pump activation – FPCM, wiring, or the pump itself.
    • During Cranking & Idling: Pressure should hold steady or possibly increase slightly from the KOEO value. Significant drops or failure to hold pressure while running points to a failing pump, pressure regulator, or an FPCM signal issue affecting pump duty cycle.
    • Under Load Test (optional but useful): Monitoring pressure during acceleration simulation can reveal if the FPCM/pump can maintain adequate pressure under higher engine loads.
  4. Confirm Fuel Pump Operation (Listen): As mentioned, absence of the initial prime sound when turning the key to "ON" indicates no activation. If you suspect sound but aren't sure, have someone else turn the key while you listen near the fuel filler neck/rear of the truck.
  5. Signal Testing at the FPCM: Advanced diagnostic step. Requires a digital multimeter, wiring diagrams, and ideally an oscilloscope. Checking for:
    • Power Input: Verifying battery voltage reaches the FPCM when the ignition is ON (at specified terminals).
    • Ground Circuit: Confirming the FPCM has good chassis ground connections.
    • Control Signal from ECM: The ECM sends a pulse-width modulation (PWM) signal to tell the FPCM what duty cycle to run the pump at. Testing for this signal requires an oscilloscope and pinpointing the correct pin.
    • Output Signal to Fuel Pump: The FPCM sends its controlled power (also PWM signal) down to the pump connector. A scope here can reveal if the module is outputting an appropriate signal when commanded. No output signal despite receiving power, ground, and ECM command strongly suggests the FPCM has failed internally.
  6. Visual Inspection: Locate the FPCM. For common underbody locations (mounted near the spare tire or on the frame rail), check for:
    • Physical Damage: Cracks in the housing.
    • Severe Corrosion: On connectors or module terminals. GM Technical Service Bulletin (TSB) #19-NA-119 (April 2019) addressed corrosion issues leading to premature failure on earlier trucks. While specifically mentioning 2014-2018 models, trucks built in late 2018 for the 2019 model year could potentially be affected depending on build date and environmental exposure.
    • Water Intrusion: Evidence of dried water trails, mud, or moisture inside the connector.
    • Loose or Damaged Wiring Harness: Chafing, cuts, or bent/pushed-out connector pins.

Replacement Options for Your 2019 Silverado Fuel Pump Control Module

Once diagnosed:

  1. OE vs. Aftermarket Parts:
    • GM Genuine / ACDelco OE: The most direct replacement, designed specifically for your VIN. Guarantees compatibility. Often considered the most reliable but also the most expensive option initially.
    • High-Quality Aftermarket: Reputable brands like Delphi, Standard Motor Products (SMP), NTK, or others offer reliable alternatives, often at a lower price point than GM. Look for units designed as direct plug-and-play replacements. Be wary of extremely cheap, no-name modules sold online.
  2. Location Matters When Ordering: Crucially, the FPCM location depends on your cab configuration for 2019 Silverados:
    • Crew Cab: The FPCM is almost universally located under the truck, typically mounted on the rear crossmember near the spare tire or on the inside of the frame rail above the spare tire area.
    • Double Cab (Extended Cab) and Regular Cab: The FPCM for these models is located inside the cabin. It is specifically mounted behind the lower passenger-side front kick panel trim (near the base of the door opening and front passenger footwell).
    • Verify Your Location! Ordering the correct replacement requires knowing where your module lives. Check physically or reference service information based on your VIN/cab style. Modules designed for the cabin are not interchangeable with modules designed for the underbody mount due to differences in weather sealing and connector orientation/design.
  3. Professional Installation vs. DIY:
    • Professional Installation (Recommended): While replacing the module itself is generally straightforward (unplug the connector, remove bolts/screws, swap module, plug in), the challenge lies in accessing it. Underbody location requires working safely under the vehicle, potentially needing support stands or a hoist. The cabin location requires careful removal of interior trim panels without breaking clips. Mechanics have the tools, lifts, and experience to do this efficiently and safely. They can also clear DTCs and perform potential reprogramming steps if necessary.
    • DIY Replacement (Experienced Only): Only attempt if you have the necessary tools, a safe way to lift the truck (for underbody modules), knowledge of removing interior trim (for cabin modules), and comfort working with automotive wiring. Ensure the battery is disconnected before touching the connectors.
  4. Potential for Reprogramming: Important Note: While many instances involve simple plug-and-play replacement, GM introduced Enhanced Feature Chassis Control Modules (EFC) starting around the 2014 model year. If the replacement module is brand new and not a direct service part taken from another truck, it will very likely require reprogramming (flashing) with GM's SPS (Service Programming System) software using a compatible scan tool like a Tech 2 or MDI unit, often accessed only through an ACDelco TDS subscription. This step calibrates the module to your specific VIN. Failure to program often results in the new module not functioning correctly (no fuel pump operation) or immediately setting DTCs. Some factors affecting reprogramming need:
    • Module Source: Brand new modules require programming. Used service modules may not if they were previously programmed to an identical configuration. It's often safer to assume programming is needed.
    • ECM Software Level: Installing a new FPCM may require the ECM to also have the latest software updates.
    • Implication: This reprogramming requirement makes DIY replacement significantly more complex for most owners, usually necessitating a trip to the dealership or a well-equipped independent shop with genuine GM diagnostics. Ask your mechanic if reprogramming will be required for the part they are installing.
  5. Cost Considerations:
    • Part Cost: Genuine GM modules are typically 500+. High-quality aftermarket can be 350+.
    • Labor Cost: Accessing and replacing the module itself is generally 0.5 - 1.5 hours labor at a shop rate. The location (underbody vs. cabin) slightly impacts this.
    • Reprogramming Cost (If Needed): Typically adds 0.3 - 1.0 hours of labor to the bill, plus any subscription fees charged by the shop. This step can add significantly to the cost.
    • Total Estimate: A realistic estimate for diagnosis, genuine module replacement, and reprogramming at a dealership often falls in the 1000+ range. Using aftermarket parts or skipping reprogramming (if possible) can reduce this cost, but carries risks.

Preventing Future 2019 Silverado Fuel Pump Control Module Failure

While no component lasts forever, you can mitigate risks:

  1. Visual Inspections: Periodically inspect the module and surrounding wiring, especially if mounted under the vehicle. Look for damage, loose connectors, and signs of severe corrosion (white or green powdery residue).
  2. Recall and Technical Service Bulletin (TSB) Checks: While not always conclusive, check for any open recalls (using your VIN on the NHTSA website or Chevy owner portal) related to the fuel system. Check if TSB #19-NA-119 or any superseding TSB might still relate to your vehicle's build date and module placement (this TSB focused on earlier model years with underbody modules exposed to corrosion).
  3. Be Vigilant About Warning Signs: Pay attention to any of the symptoms mentioned earlier. Addressing an intermittent issue early can prevent the inconvenience and potential safety hazard of a sudden stall or no-start situation far from home.
  4. Clean Connections (If Accessible): If you can safely access the underbody module connector (disconnect the battery first!), periodically disconnect it and inspect the pins. A tiny brush and electrical contact cleaner can help remove minor surface corrosion. Reconnect securely.

A faulty fuel pump control module is a common and potentially serious problem in the 2019 Chevy Silverado. By recognizing the distinct symptoms (cranks/no start, stalling, hesitation), understanding the diagnostic steps (fuses, relays, critical fuel pressure test), and knowing your replacement and potential reprogramming options, you can address this issue efficiently and get your truck back on the road reliably. When in doubt, seeking professional diagnosis and repair is the most effective way to ensure a lasting solution. Ignoring the warning signs will inevitably lead to being stranded and requiring a costly tow truck. Act promptly if you experience any of the symptoms linked to the vital fuel pump control module in your pickup truck.

Back to blog