71 A/C Evaporator Temp Sensor Circuit Low 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 71 reads as 7 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 71 mean?

71. A/C Evaporator Temp Sensor Circuit Low Temp Indicated. This code sets when your vehicle computer detects a/c evaporator temp sensor circuit low temp indicated.

Common causes of 71

How to fix 71

  1. Read codes with an ALDL scan tool
  2. Inspect the sensor connector under the dash
  3. Test sensor resistance and compare with a temp chart
  4. Check for icing on the evaporator case
  5. Check refrigerant charge if icing recurs
  6. Replace the sensor if resistance is out of range

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