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AutoCodes - Generic - P1931

P1931 Code - Fuel Additive Pump Control Circuit/Open

- Code Popularity: 7,457 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P1931?

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 Additive Level Pump
  • Fuel Additive Level Pump harness is open or shorted
  • Fuel Additive Level Pump circuit poor electrical connection
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How to Fix the DTC P1931?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1931 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

Code P1931 Description

The Fuel Additive Pump is a positive displacement pump (reciprocating pump) and, in response to commands from the fuel additive control unit, delivers a metered quantity of fuel additive to the injector on the top of the fuel tank via a short fuel pipe; the injector then injects the additive into the fuel tank.
The piezo sensor on the Fuel Additive Pump records the fill level of the fuel additive in the fuel additive tank and transmits this information to the fuel additive control unit.
Its other task is to determine any change in the viscosity of the fuel additive as a function of ambient temperatures; this may result in the metered quantity of fuel additive having to be corrected.
If the fill level of the fuel additive in the fuel additive tank falls below a certain limit, the engine system fault warning lamp in the instrument cluster will switch on.
If the fuel additive tank becomes empty, the Malfunction Indicator Lamp (MIL) will light up.

OBDII Code P1931 - Fuel Additive Pump Control Circuit/Open - AutoCodes.com
P1931 Code - Fuel Additive Pump Control Circuit/Open

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Code P1931 comments

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