B1749

Severity: High

Park/Neutral Switch Circuit Failure

Last updated: July 2026

System

Body

Subsystem

Body Electronics

Code Type

Manufacturer-specific

What does B1749 mean?

B1749 is a manufacturer-specific body diagnostic trouble code. It is defined as "Park/Neutral Switch Circuit Failure". It falls under the body electronics area of the vehicle’s body system, and its exact meaning can vary between manufacturers.

When is B1749 set?

The onboard diagnostic system sets B1749 when it detects a condition matching "park/neutral switch circuit failure" in the body electronics circuit or system. When the fault is confirmed, the module stores the code and, in most cases, turns on a warning light.

This code is generally considered serious. Continued driving may worsen the fault or affect safety and drivability. Have it diagnosed promptly.

Common symptoms

Warning light on the dashboard
A body or comfort feature not working as expected
Intermittent electrical behaviour
Related interior control not responding

Possible causes

A faulty switch, actuator or module in the affected system
Damaged wiring or corroded connectors
Low or unstable supply voltage
A blown fuse or relay
Water intrusion affecting an electrical component

What to check first

Scan the relevant body module for stored codes
Check fuses, relays and supply voltage for the affected system
Inspect connectors for corrosion, water damage or backed-out pins
Operate the affected feature while watching live data
Clear the code and verify whether it comes back

Frequently asked questions

What does the B1749 code mean?

B1749 means "Park/Neutral Switch Circuit Failure". It is a manufacturer-specific body trouble code in the body electronics area.

Is it safe to drive with a B1749 code?

Because this code is often serious, it is best to limit driving and have the vehicle diagnosed as soon as possible. Continuing to drive may worsen the fault or affect safety.

How do I fix a B1749 code?

There is no single fix. Start by confirming the code with a scan tool, then work through the likely causes and checks above — inspecting wiring, connectors and the relevant components before replacing any parts. On your specific make, confirm the diagnosis before repairs.

Can I clear the B1749 code myself?

You can clear the code with an OBD-II scan tool, but if the underlying fault is still present it will usually return. Clearing without repair is only useful to confirm whether the fault is active.

Related codes

B1750

Park/Neutral Switch Circuit Open

B1751

Park/Neutral Switch Circuit Short To Battery

B1748

Mirror Passenger Horizontal Switch Circuit Short To Ground

B1752

Park/Neutral Switch Circuit Short To Ground

Important

This information is provided for general reference only. It is not repair advice and may not apply to every make or model. Manufacturer-specific codes can differ. Always confirm a diagnosis with a scan tool and, where needed, a qualified technician before replacing parts.