B1374 Code: Meaning, Symptoms, Causes & Fix

Overview

Symptoms

• module resets or glitches
• feature inoperative intermittently
• battery draw complaints

Common causes

• Electrical fault in the affected circuit affecting illuminated entry relay short to ground
• Control module logic or calibration issue
• Connector pin damage/corrosion or harness stress near related components

How to diagnose B1374

1. Confirm B1374 and capture freeze-frame data with a professional scan tool.
2. Inspect wiring, connectors, and grounds related to illuminated entry relay short to ground for obvious defects.
3. Use freeze-frame and live data to isolate whether the issue is electrical, mechanical, or control logic.
4. Check for related DTCs to identify the root-cause chain before replacing parts.
5. After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code B1374

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

Can you drive with B1374?

The vehicle is often drivable with B1374, 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)

1. Repair obvious wiring/connector faults first to prevent repeat parts replacement.
2. Address the root fault mode (generic) in the illuminated entry relay short to ground circuit/system.
3. Apply the required relearn/adaptation procedure if specified by service information.
4. Road-test and verify B1374 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

$90-$400

Common mistakes when diagnosing B1374

• 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.

B1374 in common vehicles

B1374 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 B1374?

B1374 is commonly set by generic faults affecting illuminated entry relay short to ground.

How much does it cost to fix B1374?

For B1374, repair costs are typically $90-$400 depending on exact root cause, labor rates, and part quality.

Can I clear B1374 without repair?

You can clear B1374 temporarily, but the code usually returns until the underlying fault is corrected.

Helpful tools

• Estimate repair cost
• Decode your VIN
• Calculate fuel cost