73 A/C Evaporator Temp Sensor Circuit High Temp Indicated

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

How to read it

Code 73 reads as 7 flashes, pause, 3 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 73 mean?

73 — A/C Evaporator Temp Sensor Circuit High Temp Indicated. This code sets when your vehicle computer detects a/c evaporator temp sensor circuit high temp indicated.

Common causes of 73

How to fix 73

  1. Read codes with an ALDL scan tool
  2. Find the sensor and reseat its connector
  3. Test sensor resistance against a temp chart
  4. Check continuity of both sensor wires to the ECM
  5. Replace the sensor if open
  6. Clear the code and confirm the reading tracks cabin temp

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