Fuel Pump Control Out of Range (Ford)
What does P1235 mean?
The P1235 code means the vehicle's onboard diagnostic system has detected: Fuel Pump Control Out of Range (Ford). This is a critical severity code.
Common Symptoms
- Check Engine Light on
- Engine stalling or dying while driving
- Hard starting or extended cranking
- Loss of power under load
- Fuel pressure fluctuating wildly
Probable Causes (Ranked by Likelihood)
- Fuel pump driver module (FPDM) malfunction Very High
- Fuel pump failing or drawing excessive current High
- Corroded FPDM connector or ground point Moderate
- Wiring fault between PCM and FPDM Moderate
- Fuel pressure sensor inaccuracy Low
Step-by-Step Diagnostic Procedure
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Measure fuel pressure with a mechanical gauge and compare to scan tool readings
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Test the FPDM output voltage under various load conditions
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Check FPDM connector and ground point for corrosion
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Measure fuel pump current draw (excessive current indicates pump failure)
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Replace the FPDM if output voltage does not match PCM commands
Frequently Asked Questions
What does fuel pump control out of range mean?
P1235 means the PCM has detected that the fuel pump driver module is not controlling fuel pump output within expected parameters. The pump may be running too fast, too slow, or not responding to PCM commands.
Is P1235 related to the other P123x fuel pump codes?
Yes. P1230, P1231, P1232, and P1235 all relate to the Ford fuel pump driver module system. They indicate different aspects of FPDM failure. The FPDM is the most common component to fail in this system.
Can a clogged fuel filter cause P1235?
A severely clogged fuel filter can cause the fuel pump to work harder, drawing more current and possibly triggering the FPDM to report an out-of-range condition. Always check the fuel filter as part of diagnosis.