P1424 Code: Meaning, Symptoms, Causes & Fix

Overview

P1424 is triggered when monitoring logic identifies an issue with EGI Glow Plug Primary Failure affecting powertrain controls.

Symptoms

reduced performance
increased fuel use
check engine light

Common causes

Sensor output out of expected lower range affecting egi glow plug primary failure
High circuit resistance
Connector pin damage/corrosion or harness stress near related components

How to diagnose P1424

Confirm P1424 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to egi glow plug primary failure for obvious defects.
Compare live data against expected lower threshold and verify ground/reference circuits.
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 P1424

Moderate: This code is moderate severity: the vehicle may still operate, but fault progression can increase repair cost over time.

Can you drive with P1424?

Most vehicles can be driven short-term with P1424, but postpone heavy load/highway driving until repaired.

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 (low) in the egi glow plug primary failure circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify P1424 remains cleared under the conditions that originally set the code.

Fix options

Replace failed sensor if signal remains low.
Repair connector resistance issues.
Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$200-$900

Common mistakes when diagnosing P1424

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.

P1424 in common vehicles

P1424 appears across makes such as Ford, Toyota, Honda, Chevrolet. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P1424?

P1424 is commonly set by low faults affecting egi glow plug primary failure.

How much does it cost to fix P1424?

For P1424, repair costs are typically $200-$900 depending on exact root cause, labor rates, and part quality.

Can I clear P1424 without repair?

You can clear P1424 temporarily, but the code usually returns until the underlying fault is corrected.