P064A — Fuel Pump Control Module

OBD2 code P064A flags a problem with the fuel delivery and mixture control (fuel pump control module). Short, gentle driving to a shop is usually possible. Common culprits: faulty fuel pressure regulator, faulty fuel rail pressure sensor or wiring, contaminated or incorrect fuel.

powertrain (engine/transmission)

Is it safe to drive?

Drive with caution Drive with caution. Mixture and fuel-pressure faults can cause stalling, hesitation in traffic and — when severe — catalyst damage. Avoid long trips until diagnosed.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm P064A is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the fuel delivery and mixture control for damage, corrosion, chafing or poor contact.
Subsystem check Measure fuel pressure at the rail and compare with factory specification at idle and under load.
Subsystem check Check short-term and long-term fuel trims in live data to see which way the mixture is off.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P064A does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P064A (parts and labor, USD, independent shop rates): Clean or replace injectors: $200–$800; Replace the pressure regulator or sensor: $150–$450; Replace the fuel pump: $400–$900; Replace the fuel filter: $80–$200. Overall, fixing P064A usually costs between $80 and $900. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

Will P064A clear itself?

Sometimes P064A clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What does OBD2 code P064A mean?

What is the most common cause of P064A?

The most common causes are: faulty fuel pressure regulator, faulty fuel rail pressure sensor or wiring, contaminated or incorrect fuel.

How much does it cost to fix P064A?

Clean or replace injectors — $200–$800; Replace the pressure regulator or sensor — $150–$450; Replace the fuel pump — $400–$900; Replace the fuel filter — $80–$200. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

How do I diagnose P064A myself?

Start with a scan: confirm P064A, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the fuel delivery and mixture control, and verify the suspect component against live data before buying parts.

When your vehicle's check engine light comes on and a mechanic connects a scanner, code P064A tells you something has gone wrong with the fuel pump control module. In plain language, the engine control unit (ECU) has spotted a problem in the system responsible for delivering fuel and managing the air-fuel mixture. P064A falls into the powertrain category, meaning it affects core engine functions rather than chassis, body, or network communications.

Here's how it works: the ECU constantly monitors sensor data from the fuel delivery circuit. It compares real-time readings against factory-calibrated thresholds, running these checks across multiple drive cycles before confirming a fault. When values drift outside acceptable range, P064A triggers and the ECU saves a freeze frame snapshot — essentially a photograph of engine speed, load, coolant temperature, and vehicle speed at the exact moment the problem occurred. That snapshot is gold during diagnosis because it tells you exactly what conditions caused the failure.

The module's job is straightforward: regulate fuel pressure and ensure the injectors receive the right amount of fuel for current operating conditions. When that regulation breaks down, you'll feel it.

Symptoms of P064A

The warning signs typically appear in stages, starting mild and getting worse:

Illuminated check engine light (the most common and earliest indicator)
Noticeable loss of power when the engine is under load, such as climbing hills or accelerating
Rough idle and hesitation during throttle response
Extended cranking time or difficulty starting the engine
Strong fuel odor from the exhaust or around the engine bay in more severe cases

If you're experiencing any combination of these symptoms, P064A is a likely culprit and warrants further investigation.

Common Causes of P064A

Diagnosticians generally work through these culprits from most to least frequent:

Faulty fuel pressure regulator — this component maintains consistent fuel delivery pressure; when it fails, mixture ratios go haywire
Clogged or leaking fuel injectors — dirty injectors restrict flow, while leaking ones dump too much fuel into the cylinders
Vacuum leaks or intake manifold leaks that throw off the air-fuel mixture reading
Damaged wiring or connectors at the fuel rail pressure sensor — corrosion, broken insulation, or loose pins can send incorrect signals to the ECU
Malfunctioning fuel rail pressure sensor itself
Occasionally, a failing fuel pump that cannot maintain adequate pressure despite otherwise healthy components

How to Diagnose P064A

Follow these steps to pinpoint the root cause before replacing any parts:

Connect an OBD2 scanner and confirm P064A is stored. Save the freeze frame data immediately — it reveals engine conditions like RPM, load, coolant temperature, and speed when the fault occurred.
Scan for additional trouble codes. Related codes often point directly to the failing component rather than just the symptom.
Check manufacturer technical service bulletins (TSB) for your specific make and model. Many common P0xxx issues have documented factory fixes or software updates available.
Visually inspect the wiring harness and connectors feeding the fuel delivery system. Look for damaged insulation, corrosion, chafing from heat or movement, and loose terminal connections.
Measure fuel pressure at the rail using a gauge. Compare results against factory specifications both at idle and under simulated load conditions.
Review short-term and long-term fuel trim values in live data. Persistent positive or negative trims indicate whether the mixture is running rich or lean.
Clear the code and complete a full drive cycle, recreating the conditions from the freeze frame data. Confirm P064A does not return before considering the repair complete.

Repair Options with Pricing

Parts and labor costs vary based on which component failed. Here are typical ranges from independent shops:

Fuel injector cleaning or replacement: $200–$800
Fuel pressure regulator or sensor replacement: $150–$450
Fuel pump replacement: $400–$900
Fuel filter replacement: $80–$200

Always address the cheapest and most common failures first — injectors and fuel filters — before moving to expensive components like the fuel pump.

Total Cost to Fix P064A

The total bill depends entirely on which part triggers P064A in your vehicle. Most repairs fall somewhere between $80 and $900 when you factor in parts and labor at standard independent shop rates. The key money-saving move is getting an accurate diagnosis before purchasing any components. The fuel pump, being the priciest possible fix, should be the last thing you check — not the first.

Can You Drive with P064A?

Drive with caution. Fuel delivery and mixture control faults can lead to unexpected stalling, hesitation during acceleration, and poor throttle response — all hazardous in traffic situations. In severe cases, running overly rich or lean for extended periods can damage the catalytic converter. Avoid long highway trips until you've identified and addressed the underlying cause.