Diagnostic Fault Information
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Always perform the Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
DTC P0641 or P0651
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| Air Conditioning (A/C) Refrigerant Pressure Sensor 5-Volt Reference B Circuit | P0651 | P0532 | P0651 | - |
| Fuel Tank Pressure (FTP) Sensor 5-Volt Reference A Circuit | P0641 | P0452 | P0641 | - |
| Manifold Absolute Pressure (MAP) Sensor 5-Volt Reference A Circuit | P0641 | P0107 | P0641 | - |
| Exhaust Gas Recirculation (EGR) Valve 5-Volt Reference A Circuit | P0405, P0406 | P0404, P0405 | P0406 | - |