P1395 Code: Meaning, Symptoms, Causes & Fix

Overview

Code P1395 indicates a fault in Glow Plug Monitor Fault (Bank #1), typically within powertrain controls.

Symptoms

increased fuel use
reduced performance
rough operation in certain conditions

Common causes

High circuit resistance affecting glow plug monitor fault (bank #1)
Signal pulled low by short-to-ground
Connector pin damage/corrosion or harness stress near related components

How to diagnose P1395

Confirm P1395 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to glow plug monitor fault (bank #1) 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 P1395

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

Can you drive with P1395?

Most vehicles can be driven short-term with P1395, 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 glow plug monitor fault (bank #1) circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify P1395 remains cleared under the conditions that originally set the code.

Fix options

Verify ground path and signal integrity.
Replace failed sensor if signal remains low.
Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$200-$900

Common mistakes when diagnosing P1395

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.

P1395 in common vehicles

P1395 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 P1395?

P1395 is commonly set by low faults affecting glow plug monitor fault (bank #1).

How much does it cost to fix P1395?

For P1395, repair costs are typically $200-$900 depending on exact root cause, labor rates, and part quality.

Can I clear P1395 without repair?

You can clear P1395 temporarily, but the code usually returns until the underlying fault is corrected.