P1233
Fuel Pump Driver Module Disabled or Offline
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The P1233 code is a Ford-specific code indicating that the Fuel Pump Driver Module (FPDM) has gone offline or has been disabled. The FPDM is responsible for controlling fuel pump speed and monitoring the fuel system. When it goes offline, the fuel pump stops operating and the engine will stall or refuse to start.
The first thing to check is the inertia fuel shutoff switch. Ford vehicles are equipped with this safety device that automatically cuts fuel pump power if it detects an impact (like a collision). However, it can be triggered by hitting a large pothole, speed bump, or even rough road conditions. The switch is typically located in the trunk area or behind a kick panel in the passenger footwell — simply pressing the reset button on top of the switch may resolve the issue immediately.
If the inertia switch is not the cause, the FPDM itself may have failed. This module is mounted underneath the vehicle near the spare tire or fuel tank, making it susceptible to corrosion and road damage. Replacement FPDMs are available for $50–$150 and can be swapped with basic hand tools. If the vehicle stalls while driving, this is a safety concern and should be addressed immediately.
Severity
Symptoms
- •Engine stalls unexpectedly while driving
- •Vehicle cranks but will not start
- •Sudden loss of power while driving
- •Engine sputters and dies intermittently
- •No fuel pump noise when turning the key to the ON position
Likely Causes
Ford vehicles have an inertia switch (usually in the trunk or behind a kick panel) that shuts off the fuel pump after an impact. It can trip from hitting a pothole or bump.
The FPDM is mounted under the vehicle near the fuel tank and is exposed to road debris, moisture, and heat, which can cause it to fail.
A faulty fuel pump relay can cut power to the FPDM, causing it to go offline and stop driving the fuel pump.
Corroded or damaged wiring in the harness connecting the PCM to the Fuel Pump Driver Module can cause intermittent or total communication loss.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Check and reset the inertia fuel shutoff switch (usually located in the trunk or behind a kick panel)
- Replace the Fuel Pump Driver Module (FPDM)
- Replace the fuel pump relay
- Inspect and repair wiring between the PCM and FPDM