Cruise Control Servo Control Circuit Low
The P0595 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the cruise control servo control circuit. This circuit controls the servo motor that adjusts the throttle to maintain set speed. A low voltage reading suggests a short to ground, open circuit, or faulty component, preventing proper cruise control operation.
01. Most Common Causes
- Faulty cruise control servo motor
- Open or shorted wiring in the servo control circuit
- Corroded or loose electrical connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Cruise control inoperative
- Cruise control light on dash flashing or staying on
- Engine Check Light illuminated
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify P0595 and check for other codes.
Step 2: Visually inspect the cruise control servo connector and wiring for damage, corrosion, or loose connections.
Step 3: Test the servo control circuit voltage with a multimeter; compare to manufacturer specifications.
Step 4: If circuit is okay, test the servo motor resistance and operation; replace if faulty.
Step 5: Clear code and test drive to confirm repair.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but cruise control will not work. The vehicle remains drivable, but have it diagnosed soon to avoid potential electrical issues.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and repair, depending on the cause. Servo replacement may cost more if needed.