P1233Manufacturer-specific code

P1233 Code: Fuel Pump Control Module Disabled or Offline (Ford)

On Ford, Lincoln and Mercury, the P1233 code means the fuel pump control module is disabled or not responding. The engine may not start or may be slow to start. Corrosion at the module is a common cause.

Severity
High
Can I keep driving?
No, stop and have it checked
Estimated cost
$80 to $350
Difficulty
Medium
System
Fuel Injection
Applies to
Depends on the manufacturer

Common in: Ford

Updated Reviewed by Renzo Chacca

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What the P1233 code means

P1233 is a manufacturer-specific code: the 1 in the second position means each automaker defines what it stands for, not the generic standard. The most widespread definition is the one used by Ford, Lincoln and Mercury. If your vehicle is another brand, confirm the code text with a scan tool that supports that manufacturer.

ManufacturerMeaning of P1233
Ford, Lincoln and MercuryFuel pump control module disabled or offline

Many Fords control the fuel pump with a module (FPDM) that regulates its speed on the computer command. It is usually on the frame near the tank, or in the trunk.

The computer sets the P1233 code when it gets no response from the pump module, or the module shuts down. The module usually fails from corrosion, because it is exposed to water and road salt.

Before you repair anything, confirm the make, model, year and engine. With manufacturer codes, the same number can change even between engines from the same brand.

P1233 code symptoms

  • The engine stalls while driving.
  • The engine will not start or is slow to start.
  • Check engine light on.

Likely causes of the P1233 code

  1. Corroded or failed FPDM. The most frequent cause.
  2. Module connector. Check the locking tab and the pins, and look for moisture or corrosion.
  3. Pump fuse or relay. Swap it with an identical one to rule it out.
  4. Module ground on the frame.

How to diagnose the P1233 code step by step

  1. Locate the module near the tank or in the trunk.
  2. Check for corrosion and a damaged connector.
  3. Measure the power supply and the ground.
  4. Check the fuel pressure.

How to fix the P1233 code

  • Replace the module and protect its connector.
  • Repair the ground or the connector, then clear the P1233 code and confirm the engine starts and runs normally.

Technical reference data

  • The module receives a PWM signal from the computer and powers the pump.
  • P1xxx codes are manufacturer-specific: confirm the definition with a scan tool that supports your brand.
  • Values are approximate: check the manufacturer data for your vehicle.

Brand-specific notes

Very common on the F-150, Expedition, Mustang and Crown Victoria.

If your vehicle is another brand, check the table above for the meaning its manufacturer gives the code, and confirm it with a scan tool that supports that brand.

Frequently asked questions about P1233

What does the P1233 code mean on a Ford?
It means the fuel pump control module is disabled or not responding. The engine may not start or may be slow to start.
Does P1233 mean the same thing on every brand?
No. It is a manufacturer code, and on other brands it may not exist or it may mean something else.
Can I drive with a P1233 code?
It is not recommended. The engine can stall while driving because the pump loses its control, and you could be left stranded in traffic.
How much does it cost to fix P1233?
On a Ford the cost runs from about $80 to $350. Most of that is the new module plus labor, while a ground or connector repair costs less.
Will a P1233 code clear itself?
Not for long. A corroded module or connector can work intermittently, so the engine may start again for a while, but the fault returns.
What is the most common cause of P1233?
A corroded or failed fuel pump driver module, since it sits exposed to water and salt. Check its connector, fuse, relay and ground as well.

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Questions about the P1233 code

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