P1931 Ford Code - Fuel Additive Pump Control Circuit/Open
Quick Answer
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. Common causes include Faulty Fuel Additive Level Pump, Fuel Additive Level Pump harness is open or shorted, Fuel Additive Level Pump circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1931 Ford indicates Fuel Additive Pump Control Circuit/Open.
- Common causes
- Common causes include Faulty Fuel Additive Level Pump, Fuel Additive Level Pump harness is open or shorted, Fuel Additive Level Pump circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1931 Ford Description
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.
What are the Possible Causes of the DTC P1931 Ford?
- Faulty Fuel Additive Level Pump
- Fuel Additive Level Pump harness is open or shorted
- Fuel Additive Level Pump circuit poor electrical connection
How to Fix the DTC P1931 Ford?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1931 Ford code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1931 Ford Code
1. What does OBDII code P1931 mean on a Ford vehicle?
P1931 indicates a problem with the fuel additive pump control circuit, such as an open or malfunctioning connection.
2. What are the common symptoms of code P1931 in a Ford?
Symptoms may include the check engine light turning on, poor fuel efficiency, or issues with the diesel particulate filter (DPF regeneration process).
3. What causes code P1931 in Ford vehicles?
Common causes include a faulty fuel additive pump, damaged wiring or connectors in the control circuit, or issues with the PCM (Powertrain Control Module).
4. How can I troubleshoot code P1931 on my Ford?
Start by inspecting the wiring and connectors for damage or corrosion. Test the fuel additive pump for proper operation and check for PCM-related errors.
5. Can I drive my Ford with code P1931 active?
Driving with this code active may lead to DPF regeneration failure, which can cause increased emissions and potential engine performance issues over time.
6. How is code P1931 fixed in a Ford vehicle?
Repairs may involve replacing the fuel additive pump, repairing damaged wiring, or reprogramming/updating the PCM.
7. Does code P1931 affect the DPF system on Ford vehicles?
Yes, this code can prevent proper DPF regeneration, leading to soot buildup and reduced efficiency.
8. Is code P1931 specific to diesel Ford vehicles?
Yes, it typically appears in diesel models equipped with a fuel additive system to support the DPF.
9. How much does it cost to fix code P1931 on a Ford?
Repair costs can vary but may range from $150 to $500 depending on whether the fuel additive pump or wiring needs replacement.
10. Will clearing code P1931 solve the problem on my Ford?
Clearing the code without addressing the underlying issue will not resolve the problem and may cause the code to reappear.
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