Understanding and diagnosing ford P1237 dtc

P1237 FORD Code Fuel Pump Secondary Circuit Fault (With Video) (autocodes.com)

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DTC ) fault code ) - P1237:
Boost Control Positive Deviation

This fault code can be set when the fuel tank is empty or the specified fuel is not used. ( supermarket fuels etc have been known to cause this.. )

It can also be attributed to a turbo fault - if the fault is no turbo boost.

You haven't given enough info to diagnose the problem. Did the car die while idling? Could it be restarted? Will it run if you keep your foot on the gas pedal? Etc...

Did you ever get to the bottom of this? I am having exactly the same issue with my 2006 Focus 1.6 tdci

The code is for the fuel pump circuit - possibly a faulty fuel pump driver module. The circuit would need to be tested.

The P1237 means Fuel Pump Secondary Circuit Malfunction.
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autel maxidas ds708

Hello! The P1237 is more than likely a bad fuel pump..However here are a couple of issues to eliminate first...In the trunk on the drivers side directly behind the taillight is a Red Button...This is the inertia fuel shut off switch...Push down on the Button to be sure it is reset...Try to start the car...If it still does not start...On the fuel rail is a cap much similar to a tire valve stem cover..It's the fuel pressure release...Push in the center and fuel should squirt out...If not the fuel pump is defective and needs to be replaced...

Guru...saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

jjonas72 - I just wanted to let you know that I picked up on this one. You asked about Diagnostic Trouble Code P1237.

I missed that during our chat...P1237 is for the Fuel Pump Driver Module (FPDM) NOT the fuel pump itself. We need to talk some more.

P1237 - Fuel Pump Secondary Circuit Malfunction

Electronic Returnless Fuel Systems (ERFS) utilize a Fuel Pump Driver Module (FPDM) to control fuel pressure. The PCM uses a Fuel Rail Pressure Sensor (FRP) for feedback. The PCM outputs a duty cycle to the FPDM to maintain the desired fuel rail pressure. During normal operation, the PCM will output a FP duty cycle from 5% to 51%. The FPDM will run the fuel pump at twice this duty cycle, e.g. if the PCM outputs a 42% duty cycle, the FPDM will run the fuel pump at 84%. If the PCM outputs a 75% duty cycle, the FPDM will turn off the fuel pump.

If the FPDM does not out any diagnostic signal, (0 or 100% duty cycle), the PCM sets a P1233 DTC. This DTC is set if the FPDM loses power. This can also occur if the Inertia Fuel Switch is tripped.

If the FPDM outputs a 25% duty cycle, it means that the fuel pump control duty cycle is out of range. This may occurs if the FPDM does not receive a valid control duty cycle signal from the PCM. The FPDM will default to 100% duty cycle on the fuel pump control output. The PCM sets a P1235 DTC.

If the FPDM outputs a 75% duty cycle, it means that the FPDM has detected an open or short on the fuel pump control circuit. The PCM sets a P1237 DTC.


Keep us updated.

P1237--Fuel Pump Secondary Circuit Malfunction

It could be an issue with the fuel pump
Also there are several other steps to follow,
before arriving at a bad pump
Most involve some type of short, detected in the
wiring along the way.That is the short explanation

You really need a diagnostic trouble chart to follow

So,you will have to seek help at a local repair shop
I wouldn't give away extra money at a dealer.