01 This Tiny Light On Your Dashboard Could Be The Difference B… • 02 How A Simple Mistake At The Gas Pump Could Destroy Your Eng… • 03 Why Do Car Engines Have a Redline and What Happens If You E… • 04 Maintaining and Troubleshooting Diesel Particulate Filters … • 05 What happens if you put petrol in a diesel engine? • 06 What Makes Ferrari, Lamborghini and Porsche Sport Cars Uniq… • 07 Why Wrong Donut Tire's Position Could Cost You Thousands in… • 08 B0022, B0024, and B0026: Left Front or Driver Frontal Deplo… • 09 How To Fix Automatic Transmission Not Shifting • 10 The Mitsubishi Outlander PHEV: A Plug-in Hybrid SUV That Ch… •

DTC codes / Ford codes / P1189

P1189 · FordPump Speed Signal Fault

P1189 on Ford vehicles indicates that the powertrain control module (PCM) has detected an abnormal signal from the fuel pump speed sensor or circuit. The PCM expects a specific pulse pattern or voltage from the pump speed sensor that correlates with commanded fuel pump speed, and when that signal is missing, erratic, or out of range, the code is stored.

SystemPowertrain
Code typeFord specific
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms
  • Engine may crank but fail to start or start hard, especially when cold
  • Rough running or hesitation under acceleration due to inadequate fuel delivery
  • Stalling at idle or during deceleration, particularly after the engine is warm
  • Reduced engine power or limp mode in some Ford models
  • Audible whine or unusual noise from the fuel tank area if the pump is failing

Common causes, most likely first

  1. Faulty fuel pump speed sensor or contaminated sensor tip
  2. Damaged or corroded wiring harness or connector at the fuel pump module
  3. Failed fuel pump control module (FPDM) not sending correct speed signal
  4. Open or shorted circuit in the pump speed signal wire
  5. Poor ground connection at the fuel pump assembly or chassis
  6. Internal fuel pump mechanical wear causing erratic speed output
  7. PCM software glitch or internal fault (rare, but possible)

How to diagnose and fix it

  1. Perform a visual inspection of the fuel pump wiring and connector for corrosion, chafing, or loose pins
  2. Check fuel pump speed sensor signal with a scan tool or oscilloscope to confirm erratic or missing pulses
  3. Measure resistance and continuity of the pump speed signal circuit from the PCM to the fuel pump module
  4. Verify fuel pump control module operation and grounds, swapping with a known-good unit if necessary
  5. Remove and inspect the fuel pump assembly for sensor damage or debris; clean or replace sensor if needed
  6. Check for technical service bulletins (TSBs) or PCM software updates related to P1189 for the specific Ford model
  7. If all electrical checks pass, replace the fuel pump assembly as a last step after confirming signal absence

Don't overlook the fuel pump control module

  • A common misdiagnosis is replacing the fuel pump when the actual fault lies in the fuel pump control module (FPDM), which often fails intermittently and does not always set a separate code.
  • Corroded connectors at the fuel pump assembly, especially in areas with road salt, can cause P1189 without any driveability symptoms, so a thorough visual inspection is critical.
  • Some Ford models require a relearn procedure or PCM reprogramming after fuel pump replacement to avoid false P1189 returns.
  • P1189 can be set by a weak battery or charging system issue that causes voltage spikes, so always check battery health and grounds before condemning the pump.
  • The code may appear only during certain conditions like low fuel level or high ambient temperatures, so intermittent diagnosis requires monitoring live data during a test drive.

Can I keep driving with P1189?

If the vehicle is running normally with only the check engine light on, you can drive short distances to a repair shop, but avoid heavy acceleration or towing. If the engine stalls, runs rough, or loses power, stop driving and have the vehicle towed to prevent safety risks and further damage.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Ford vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage