Stalling, check engine light on and code P1235

Tiny
CARSON GAMBS
  • MEMBER
  • 2017 FORD FIESTA
  • 0.6L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 77,000 MILES
My car has been stalling superbad. It goes on and off and the engine and wrench light come on. I have changed the throttle body pedal sensor and still coming up with the same code P1235.
Wednesday, January 6th, 2021 AT 7:40 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Couple things. First can you confirm which engine you have? You said it was a 0.6 but I assume you mean a 1.6L. Then the P1235 is not listed for this vehicle so are you pulling this code with a generic scan tool?

However, this code is for a fuel pump control circuit out of range so we need to check voltage at the driver module which should be under the front seat. I attached the wiring diagram, so let's check for 12 volts on pin 1 and then make sure the ground is okay on pin 4.

If the power and ground are good then let me know the voltage is on the other pins with the key on and we can figure out if the driver or pump is the issue.

Here is a guide that will help with this type of testing:

https://www.2carpros.com/articles/how-to-check-wiring

Let me know what questions you have. Thanks
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Thursday, January 7th, 2021 AT 4:28 PM

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