Circuit Description
WARNING: This page is about a different variant/trim than selected.
The powertrain control module (PCM) provides 5 volts to the following sensors.
- The air conditioning (A/C) refrigerant pressure sensor (Pontiac)
- The manifold absolute (MAP) pressure sensor (Buick)
- The barometric pressure (BARO) sensor (L32 only)
A circuit condition on one sensor 5-volt reference circuit may affect the other sensor 5-volt reference circuits. The PCM monitors the voltage on the 5-volt reference circuit. If the PCM detects that the voltage is out of tolerance, DTC P0651 sets.