Engine-Codes - Generic - P109D

P109D Code - Short in Fuel Pressure Switching Valve Circuit

- Code Popularity: 2,630 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P109D?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Fuel Pressure Switching Valve
  • Fuel Pressure Switching Valve harness is open or shorted
  • Fuel Pressure Switching Valve circuit poor electrical connection
  • Faulty F/PMP VSV relay
  • Faulty Engine Control Module (ECM)
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How to Fix the DTC P109D?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P109D code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the P109D Code Mean?

A Flexible Fuel Vehicle (FFV) can be used with a fuel containing a high concentration of ethyl alcohol.
This FFV uses a fuel pressure switching system which changes the fuel pressure to low or high using a fuel pressure switching valve.
The code is stored when a malfunction is detected in the fuel pressure switching valve circuit. If the voltage of the fuel pressure switching valve circuit is different from the voltage commanded by the Engine Control Module (ECM), the ECM determines that the fuel pressure switching valve circuit is open or shorted, and stores a DTC.

P109D Code - Short in Fuel Pressure Switching Valve Circuit

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Code P109D Information for Specific Makes

  • P109D Lexus Short in Fuel Pressure Switching Valve Circuit
  • P109D Toyota Short in Fuel Pressure Switching Valve Circuit

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