What is CID 989 & How to Solve It?

What is CID 989:

cid 989 refers to a problem with the fuel pump control module. the ecm detects that the module is not delivering the proper fuel pressure command to the pump.

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Why This Happens:

• faulty fuel pump control module.
  
• damaged wiring harness.
  
• poor ground or power supply.
  
• fuel pump wear or restriction.
  
• ecm miscommunication.
  
  

How to Fix It:

1. inspect the fuel pump module and wiring.
   
2. test voltage signals at the pump terminal.
   
3. verify ground connections and fuse integrity.
   
4. replace the module or pump if faulty.
   
5. reset ecm and verify pressure values.
   
   

How to Avoid It Before It Happens:

• perform pressure checks during fuel filter replacements.
  
• inspect harnesses for corrosion.
  
• test fuel system voltage regularly.
  
• clue’s fuel management services monitor fuel pressure modules to prevent delivery issues in heavy-duty fleets.