GM OBD Trouble Code 70

By Jim Taddei, May 1, 2009

A/C Pressure sensor circuit error (high pressure indicated)

The ECM monitors the A/C system pressure sensor circuit. If the system pressure is to high the ECM will not allow the A/C compressor to operate. 

Fault Code Description

  • 70 - A/C Pressure sensor circuit error (high pressure indicated)


  • Poor A/C performance

Common Problems

  • Faulty A/C pressure sensor
  • Quick test - On A/C systems with multiple pressure sensors, on a cold engine with the key on and the engine off the scan tool readings for the A/C pressure sensors should all be the same.

No comments yet...

Sign in to comment

Related Questions

See what others have asked about this, or visit the Questions page to ask your own question.
Why would my a.c. quit right after it got recharged.saw some smoke or steam emit from under hood and smelled fumes af...
What is the problem when the a c blows cold for a while and then blows hot