68 A/C Clutch Relay Circuit Shorted To Ground

Make
GM (1982-1995)
Category
Powertrain - Computer and Auxiliary Controls
Severity
Check Engine Light
Applies to
1988-1995 C/K trucks, Camaro, Corvette, Caprice

How to read it

Code 68 reads as 6 flashes, pause, 8 flashes 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 68 mean?

68 — A/C Clutch Relay Circuit Shorted To Ground. This code sets when your vehicle computer detects a/c clutch relay circuit shorted to ground.

Common causes of 68

How to fix 68

  1. Read codes with a paperclip jumper
  2. Pull the A/C clutch relay and see if the code changes
  3. Test relay coil resistance and swap in a known good relay
  4. Inspect the harness for chafing on brackets and the compressor
  5. Test the clutch coil draw
  6. Replace the failed part and verify clutch cycles normally

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