Cruise Control Disabled Due to Excessive Speed
The P0574 code indicates that the powertrain control module (PCM) has detected the vehicle's speed exceeds the maximum threshold for cruise control operation, typically above 120 mph. This safety feature prevents engagement or disengages cruise control to avoid unsafe speeds. The issue may stem from a faulty vehicle speed sensor (VSS), a malfunctioning cruise control switch, or a software glitch in the PCM. In rare cases, it could be caused by a miscommunication between the PCM and the transmission control module (TCM) or a problem with the wiring harness.
1. 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 error or calibration issue
2. Symptoms You Will Notice
- Cruise control will not engage or disengages unexpectedly
- Check Engine Light illuminated
- Cruise control indicator light flashing or off
- Vehicle speed reading erratic on speedometer
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm P0574 and check for additional codes.
Step 2: Inspect the vehicle speed sensor and its wiring for damage or corrosion.
Step 3: Test the cruise control switch and module for proper operation using a multimeter.
Step 4: Check for any PCM software updates or recalibration procedures from the manufacturer.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, it is safe to drive, but cruise control will be disabled. Avoid exceeding safe speed limits and have the issue diagnosed soon.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150, depending on whether a sensor replacement or wiring repair is needed.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.