P05C6

Symptoms

• Check Engine Light Flashes or Intermittently Comes On and Off
• Unstable, jumping pressure readings on the diagnostic scanner
• Symptoms may come and go for no apparent reason
• Possible periodic inclusion of engine emergency mode
• The problem may occur on bumps, during vibration, or after warming up.

Causes

• Loose or oxidized coolant pressure sensor connector
• Damaged wire with broken insulation (rubbed against the body or engine)
• Unreliable contact in the connector (bent or fallen contacts)
• Unstable internal sensor element (beginning of failure)
• Thermal cycles: a wire or contact works at one temperature and fails at another

How to Fix

1. Read frozen frame code and data; pay attention to the conditions of appearance (temperature, speed, load)
2. Carefully inspect the sensor connector: there is no oxidation, bent contacts, or traces of moisture.
3. Move the sensor wiring with the engine running and observe the scanner readings - a jump in the signal will indicate the location of the damage
4. Check each wire of the sensor circuit for integrity and insulation - especially in places of kinks and fasteners
5. Clean the connector contacts with a special agent and treat with moisture-proof lubricant.
6. Replace the sensor if the wiring is in good condition; if damage to the wire is detected, repair or replace

Related codes

Error P05C6 by Vehicle Brand