Pontiac G5 P0505: Idle Air Control System- Malfunction

P0505 is an OBDII code that deals with the idle air control system in the Pontiac G5.  It’s a generic code, which means that it has the same meaning for the G5 as it would any other vehicle (G5 or not). P0505:  Idle Air Control System:  Malfunction When P0505 is triggered, it is typically caused … Read more

Pontiac G5 P0158: Oxygen Sensor High Voltage (Bank 2 -Sensor 2)

  P0158 is an OBDII code that occurs in many vehicles, including the Pontiac G5. The code is triggered when: The voltage at the O2 sensor remains above threshold for 20 seconds or more Voltage to the sensor is to high (wiring problem, think short) Bad O2 sensor itself There are also some less likely problems … Read more

Pontiac G5 P0139: O2 Sensor Slow Response (Bank 1 -Sensor 2)

P0139 is a common OBDII code that occurs in many vehicles, including the Pontiac G5. The code is triggered when there is an issue with the response time from the oxygen (O2) sensor when switching voltage levels. The Oxygen sensors are responsible for helping the ECM meter oxygen levels in the exhaust, and helping to … Read more

Pontiac G5 P0140: O2 Sensor → No Activity Detected B1S2

P0140 is a generic OBDII trouble code. It has the same meaning for any vehicle with OBDII, including the Pontiac G5. It means that the PCM/ECM is not detecting any activity from the sensor.  It doesn’t mean that the O2 sensor isn’t getting power, but that the voltage isn’t changing, which is the “no activity”. … Read more