P064A: The fuel pump control module reports a fault
Fuel pump control module / fuel pump driver module error
Severity: Inspect soon
Owners report the code with stalling, limp mode and a truck that would not restart, so a real fuel delivery fault can sit behind it. Mazda's own bulletin says on the CX-9 the code can be stored with no drivability concern, so the symptoms decide how urgent it is.
It gets more serious if:
- Stop: Stop driving if the engine stalls, loses power or will not restart. Stalling in traffic is dangerous, and a Mazda owner and a GMC owner both describe the vehicle stalling and blocking lanes.
P064A in short
P064A means the engine computer sees a fault in the fuel pump control module, the unit that drives the fuel pump. Causes range from a software issue on some Mazda CX-9s to melted wiring and a failed module on Ford Super Duty trucks. If it stalls or loses power, stop driving and get it checked.
Many vehicles use a separate module that controls how hard the electric fuel pump runs. The engine computer talks to it and compares actual fuel pressure with its target. P064A is set when the computer decides the module has an error.
The cause depends on the vehicle. Mazda's bulletin for the 2016-2017 CX-9 says the code can be stored when fuel pressure differs from target by 10 kPa or more, causes no drivability problem, and that the detection function has been disabled in software. A Ford owner reports a melted connector pin that fed the module and a module replacement, and Ford has a bulletin for 2018-2019 Super Duty trucks where a loose PCM connector sets several codes including P064A.
Water in the module is another reported cause: one GMC Sierra owner says water got into the fuel system control module and the dealer replaced it. A Mazda owner and a Kia owner report stalling and limp mode with the code, so a code with symptoms should be treated as a real fuel supply fault.
Most likely causes
Cause 1: Damaged power wiring or connector to the fuel pump control module
Supported by vehicle data- Why it ranks here
- A Ford owner reports a melted connector pin that gave poor power to the module with P064A stored; Ford's bulletin also names a poorly seated PCM connector.
- What would change this
- Rises if heat damage or a loose pin is found at the module or junction box. Falls if connectors and power feeds are clean.
Cause 2: Failed fuel pump control module
Supported by vehicle data- Why it ranks here
- Ford's dealer readout calls P064A a fuel pump control module internal fault, and a GMC owner reports a module replaced after water got in through its seal.
- What would change this
- Rises if the wiring and power feeds test good and the code returns. Falls if a wiring fault is found.
Cause 3: Engine computer software or detection logic (2016-2017 Mazda CX-9)
Supported by vehicle data- Why it ranks here
- Mazda says the code can be set by inadequate detection logic and disabled the detection function in software when no other fuel pump codes are stored.
- What would change this
- Rises if the CX-9 has no drivability problem and no other fuel pump codes. Falls if the car stalls or other fuel codes are stored.
Cause 4: Low fuel pressure from the pump or fuel system
Possible — needs testing- Why it ranks here
- Mazda describes the detection condition as actual fuel pressure differing from target, so a real pressure fault is a possible cause, particularly when the car stalls.
- What would change this
- Rises if measured fuel pressure is below target. Falls if pressure is normal.
What to test first
Start at step 1. Each result tells you what it means and where to go next.
Step 1: Read all stored codes. Note other fuel system codes such as fuel pump driver circuit or fuel pressure codes stored with P064A.
IfP064A is the only code, the car drives normally, and it is a 2016-2017 Mazda CX-9
It meansThis matches Mazda's bulletin; ask a dealer about the software.
Points to: Engine computer software or detection logic (2016-2017 Mazda CX-9)
IfOther fuel pump or fuel pressure codes are stored, or the vehicle stalls
It meansTreat it as a real fuel supply fault and check the power feed.
Step 2: Have a shop inspect the fuel pump control module connector, the fuse and junction box feed for heat damage, corrosion or water, and test the power and ground at the module.
Warning:The fuel system holds fuel under pressure and a short in these circuits can overheat and start a fire. Disconnect the battery only as the service information says, and let a shop do this work.
IfA melted or corroded connector, a blown fuse or water at the module is found
It meansWiring or module damage is the cause.
Points to: Damaged power wiring or connector to the fuel pump control module
IfPower and ground are good
It meansCheck fuel pressure against target, then the module.
Step 3: Measure fuel pressure against the specification for your engine.
Warning:Fuel is flammable and under pressure. Relieve system pressure and avoid sparks, as the service information describes.
IfPressure is below target
It meansThe pump or fuel supply is not delivering.
IfPressure is normal but the code returns
It meansThe module itself is suspect.
Symptoms
- Check engine light, sometimes with no change in how the car drives
- Reduced power or limp mode above about 50 mph
- Engine stalls and will not restart Gets more serious: stop and have it checked.
- Long cranking or no-start after refuelling
How to fix
Step 1: Read all stored codes and note any other fuel system codes.
Step 2: On a 2016-2017 Mazda CX-9 with no drivability problem, ask a dealer whether the PCM software update in Mazda's bulletin applies.
Parts and cost context
- Fuel pump:Wiring repair, junction box or module replacement have all been reported. Get the power feed tested before replacing the module. Labour varies; get a quote.
Labor varies by vehicle and shop; get a quote before you approve a repair.
Compare used part prices on PartPriceGuideOn your vehicle
MazdaYour car
2016–2017 · CX-9
Supported by vehicle dataMazda bulletin 01-010/17 says P064A can be stored with no drivability concern and has the detection disabled in software. One 2017 CX-9 owner reports a stall with the code. Whether the bulletin is still current is not verified.
01-010/17Status unverified
DTC P064A stored in the PCM
2016–2017cx-9 · issued · NHTSA 10120380
Says P064A can be stored with no drivability concern and that the detection function for the code has been disabled in the PCM software.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
FordYour car
2017–2019 · F-250 Super Duty
Supported by vehicle dataA 2017 owner reports a melted connector pin and a module replacement with P064A. Ford bulletin SSM 47656 covers a loose PCM connector on 2018-2019 trucks. Whether the bulletin is still current is not verified.
SSM 47656Status unverified
MIL with P2122, P2127, U0401, U0109, P0480, P008A, P025C, P027A and/or P064A
2018–2019f-250-super-duty · 6.7L · issued · NHTSA 10152471
Says the codes may be due to PCM connector C1232B not being properly seated; applies to 6.7L engines built 1-Dec-2017 through 1-Aug-2018.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
KiaYour car
2019 · Optima
Possible — needs testingA 2019 Optima owner reports limp mode and loss of power above 50 mph after a repair for P064A. Owner narrative only.
GMCYour car
2009 · Sierra 1500
Possible — needs testingA 2009 Sierra owner reports water entering the fuel system control module and the module replaced after a stall with P064A. Owner narrative only.
Related codes
No curated relationships for P064A yet.
P064A questions
Is it safe to drive with P064A?
It depends on the symptoms. If the car drives normally, as Mazda describes for some CX-9s, it can wait for a check. If it stalls, loses power or will not restart, stop driving.
Do I need a new fuel pump control module?
Not first. Melted wiring, a loose connector, water or software can set the code, so test the power feed before replacing the module.
Sources and review
- P064A trouble code summary
- 01-010/17: DTC P064A stored in the PCM (CX-9)
- NHTSA complaint ODI 11568117 (2017 Ford F-250 Super Duty)
- NHTSA complaint ODI 11742841 (2019 Kia Optima)
- NHTSA complaint ODI 11447878 (2017 Mazda CX-9)
- NHTSA complaint ODI 10586161 (2009 GMC Sierra 1500)
- SSM 47656: MIL with P2122, P2127, U0401, U0109, P0480, P008A, P025C, P027A and/or P064A (2018-2019 Super Duty 6.7L)
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error