70 A/C Pressure Sensor Circuit High Pressure Indicated

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

How to read it

Code 70 reads as 7 flashes, pause, 0 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 70 mean?

70. A/C Pressure Sensor Circuit High Pressure Indicated. This code sets when your vehicle computer detects a/c pressure sensor circuit high pressure indicated.

Common causes of 70

How to fix 70

  1. Read codes with an ALDL scan tool
  2. Compare sensor reading with manifold gauges
  3. Check the condenser for debris and the fan for operation
  4. Recover and weigh the charge if overfilled is suspected
  5. Replace the sensor if gauges read normal but signal reads high
  6. Clear the code and verify head pressure stays in range

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