What is CID 84 & How to Solve It?

What is CID 84:

CID 84 refers to a problem with the vehicle's transmission system, particularly the transmission control module (TCM). The ECM detects that the TCM is malfunctioning, which can affect gear shifts, leading to poor acceleration or shifting issues.

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Why This Happens:

• Faulty transmission control module.
  
• Shorted or damaged wiring in the control circuit.
  
• Low transmission fluid levels.
  
• Loose or corroded connectors.
  
• ECM failure to properly interpret TCM data.
  
  

How to Fix It:

1. Inspect the transmission control module for faults or damage.
   
2. Check wiring and connectors for visible damage or corrosion.
   
3. Ensure proper transmission fluid levels and condition.
   
4. Reprogram or replace the TCM if necessary.
   
5. Perform diagnostic checks to ensure proper transmission operation.
   
   

How to Avoid It Before It Happens:

• Perform regular transmission system checks.
  
• Inspect transmission fluid levels regularly.
  
• Keep connectors clean and secure.
  
• Perform routine diagnostics to monitor TCM health.
  
• Clue’s fleet management software helps monitor transmission systems to prevent shifting or performance issues.