61 A/C System Performance Fault

Make
GM (1982-1995)
Category
Powertrain - Computer and Auxiliary Controls
Severity
Check Engine Light
Applies to
1990-1995 Corvette, Camaro, Caprice, C/K trucks

How to read it

Code 61 reads as 6 flashes, pause, 1 flash on the check-engine light. Jump terminals A and B on the ALDL connector with the key off, then turn the key on with the engine off and count the check-engine flashes.

What does GM code 61 mean?

61. A/C System Performance Fault. This code sets when your vehicle computer detects a/c system performance fault.

Common causes of 61

How to fix 61

  1. Read codes with an ALDL scan tool and note engine temp
  2. Check belt condition and tension
  3. Check refrigerant pressure with gauges
  4. Verify the cooling fan runs when the A/C is on
  5. Test the pressure sensor signal against gauge pressure
  6. Fix the root cause, clear the code and retest A/C on

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