Cruise Control System - Vehicle Speed Too High
The P0574 code indicates that the Powertrain Control Module (PCM) has detected that the vehicle speed is exceeding the maximum allowable speed for cruise control operation. This typically occurs when the vehicle speed is above the cruise control's set limit, often around 85-100 mph depending on the manufacturer. The system disengages cruise control to prevent unsafe operation. Possible causes include a faulty vehicle speed sensor, a malfunctioning cruise control switch, or a software issue in the PCM.
01. Most Common Causes
- Faulty vehicle speed sensor (VSS)
- Malfunctioning cruise control switch or module
- Wiring or connector issues in the cruise control circuit
- PCM software glitch or calibration error
02. Symptoms You Will Notice
- Cruise control disengages unexpectedly
- Cruise control cannot be set or activated
- Check Engine Light illuminated
- Vehicle speed reading erratic or incorrect
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for any related codes (e.g., P0500 for VSS).
Step 2: Inspect the vehicle speed sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Test the cruise control switch and module for proper operation using a multimeter.
Step 4: Check for any technical service bulletins (TSBs) related to PCM software updates for cruise control issues.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, it is generally safe to drive, but cruise control will be disabled. The vehicle's normal braking and acceleration functions remain unaffected.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on the root cause. Replacing a vehicle speed sensor may cost $100-$200 including labor.