Cruise Control Input Circuit Low
The P0576 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the cruise control input circuit. This circuit typically includes the brake switch, clutch switch (manual transmission), or the cruise control switch itself. A low voltage reading suggests a short to ground, a faulty switch, or a wiring issue. The PCM uses this input to disengage cruise control when the brake or clutch is applied; a low signal may prevent cruise control from engaging or cause it to disengage unexpectedly.
01. Most Common Causes
- Faulty brake light switch
- Short to ground in cruise control circuit wiring
- Faulty cruise control switch
- Corroded or damaged connector
- Blown fuse related to cruise control
02. Symptoms You Will Notice
- Cruise control does not engage
- Cruise control disengages unexpectedly
- Brake lights may not work properly
- Check Engine Light illuminated
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P0576 and check for other codes.
Step 2: Inspect brake light operation; if brake lights are stuck on or off, test brake switch.
Step 3: Visually inspect wiring and connectors for damage, corrosion, or shorts.
Step 4: Test voltage at cruise control switch and brake switch with a multimeter.
Step 5: Check fuses related to cruise control and brake lights.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive, but cruise control will not function. If the brake lights are affected, it may pose a safety risk. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs typically range from $50 to $150, depending on the cause. A brake switch replacement is often under $100, while wiring repairs may be higher.