P1189 Code: Meaning, Symptoms, Causes & Fix

Overview

Code P1189 indicates a fault in Pump Speed Signal Fault, typically within powertrain controls.

Symptoms

reduced performance
increased fuel use
check engine light

Common causes

Component failure in the monitored system affecting pump speed signal fault
Control module logic or calibration issue
Connector pin damage/corrosion or harness stress near related components

How to diagnose P1189

Confirm P1189 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to pump speed signal fault for obvious defects.
Use freeze-frame and live data to isolate whether the issue is electrical, mechanical, or control logic.
Check for related DTCs to identify the root-cause chain before replacing parts.
After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code P1189

Low: This code is low to moderate severity in most cases, but diagnosis is still recommended to avoid recurring warnings.

Can you drive with P1189?

The vehicle is often drivable with P1189, but plan a repair window to prevent repeat faults.

If the warning lamp is flashing or drivability/safety is affected, avoid driving and diagnose immediately.

How to fix it (step-by-step)

Repair obvious wiring/connector faults first to prevent repeat parts replacement.
Address the root fault mode (generic) in the pump speed signal fault circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify P1189 remains cleared under the conditions that originally set the code.

Fix options

Test component operation and replace if faulty.
Clear code and confirm through drive cycle.
Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$100-$450

Common mistakes when diagnosing P1189

Replacing parts without verifying voltage, ground, and signal integrity first.
Ignoring related stored/pending codes that indicate upstream faults.
Skipping post-repair verification drive cycle and readiness checks.

P1189 in common vehicles

P1189 appears across makes such as Mazda, Subaru, Lexus, Jeep. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P1189?

P1189 is commonly set by generic faults affecting pump speed signal fault.

How much does it cost to fix P1189?

For P1189, repair costs are typically $100-$450 depending on exact root cause, labor rates, and part quality.

Can I clear P1189 without repair?

You can clear P1189 temporarily, but the code usually returns until the underlying fault is corrected.