P2568 moderate

Engine Coolant Temperature Sensor Reference Voltage Circuit High

The P2568 code means the vehicle's onboard diagnostic system has detected: Engine Coolant Temperature Sensor Reference Voltage Circuit High. This is a moderate severity code.

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Keep driving?
Short distances only
DIY difficulty
moderate
Estimated cost
$80 - $250 (parts and labor)
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Common Symptoms

  • Check Engine Light on
  • Engine temperature gauge reads incorrectly
  • Cooling fan may run constantly
  • Engine may run lean
  • Difficulty starting in cold weather

Probable Causes (Ranked by Likelihood)

  • Short to voltage in coolant temperature sensor circuit Very High
  • Failed coolant temperature sensor High
  • Damaged wiring near exhaust or engine heat source Moderate
  • ECM/PCM internal fault Low

Step-by-Step Diagnostic Procedure

  1. Read freeze frame data and confirm P2568 is stored

  2. Measure reference voltage at coolant temperature sensor connector

  3. Inspect wiring for shorts to battery voltage near hot engine components

  4. Replace sensor and verify reference voltage returns to normal

Frequently Asked Questions

What does P2568 mean?

P2568 means the reference voltage for the coolant temperature sensor is higher than expected, typically from a wiring short or sensor failure.

Can I drive with a P2568 code?

Short distance driving is okay, but engine cooling and fuel mixture may not be properly managed. Get it diagnosed to avoid potential overheating issues.

How much does it cost to fix P2568?

Repairs usually range from $80 to $250, with sensor replacement being the most common and affordable fix.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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