What is CID 986 & How to Solve It?

What is CID 986:

cid 986 points to an issue with the turbo boost control valve circuit. when this valve fails, the ecm cannot regulate turbo pressure, causing power loss or excessive boost.

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Why This Happens:

• faulty boost control valve.
  
• damaged vacuum lines or hoses.
  
• shorted or open circuit in wiring harness.
  
• clogged air passages.
  
• turbo actuator malfunction.
  
  

How to Fix It:

1. inspect turbo control valve and lines for leaks.
   
2. test valve response through diagnostic commands.
   
3. repair or replace damaged wiring.
   
4. clean any blockages in boost lines.
   
5. replace valve if unresponsive under test.
   
   

How to Avoid It Before It Happens:

• inspect vacuum hoses during every oil change.
  
• perform turbo system cleaning regularly.
  
• check boost values via diagnostics.
  
• clue’s construction fleet management software tracks turbo performance for optimal power and reliability.