How severe is fault code C1174?

Serious — Stop or limit driving

OBD Code C1174: Park Brake Switch # 2 Applied Circuit Failure

Q: What does OBD code C1174 mean?

Park Brake Switch # 2 Applied Circuit Failure. Your vehicle's second parking brake switch isn't sending the right electrical signal to the engine computer. Think of it like a light switch that's either stuck or broken—the computer can't tell if the parking brake is actually engaged.

Q: What are the symptoms of fault code C1174?

Parking brake warning light stays on or flickers, Inability to shift out of Park (on some vehicles), Brake system warning messages on dashboard

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What This Actually Means

In plain language — no jargon

Your vehicle's second parking brake switch isn't sending the right electrical signal to the engine computer. Think of it like a light switch that's either stuck or broken—the computer can't tell if the parking brake is actually engaged.

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Symptoms You May Notice

3 known symptoms for this code

Parking brake warning light stays on or flickers

Inability to shift out of Park (on some vehicles)

Brake system warning messages on dashboard

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Embedded Systems Insight

What the ECU/ECM is actually computing

The ECU monitors the voltage signal from the park brake switch #2 circuit to verify the parking brake status. It expects a clean high or low voltage signal depending on brake position. A fault occurs when the signal is absent, shorted, or stuck at an unexpected voltage level.

Voltage & Parameter Thresholds

Parameter	Normal Range	Fault Condition
Switch Signal Voltage	0V (disengaged) or 5V (engaged)	Open circuit, shorted to ground, or intermediate voltage
Signal Continuity	Continuous valid transitions	No signal or intermittent dropout

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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex

1

Parking brake switch connector

Clean or reseat the connector at the parking brake mechanism to restore electrical contact.

2

Parking brake switch wiring harness

Inspect wiring for cuts, corrosion, or pinches between the switch and ECU; repair or replace damaged sections.

3

Park brake switch #2

Replace the switch itself if connector and wiring test normal and resistance is out of spec.