U068ALost Communication With Barometric Pressure Sensor C
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Barometric sensor C appears in two very different layouts. In GM's dual-throttle tables 23OBDG07/24OBDG07 it measures the air ahead of the bank 1 throttle; P227C and P227D judge its raw value (under 50 or over 115 kPa, 2 s), and U068A is set once the bank 1 SENT frames carry an incorrect length for 1.5 s, two trips to MIL. Oddly, GM's description calls the part pressure sensor 2 although the frames are labelled bank 1. GM's diesel tables 25OBDG04A/04B place sensor C inside a LIN air-mass meter instead: a low reading there sets P227C (Type B), but a missing reply is logged as U060F for the meter, not as U068A. U0680 is the bank 2 partner. The controller falls back on modelled pressure.
- What you may notice
- Check engine light after two trips
- Bank 1 fueling less precise
- Accompanying pressure codes P227B to P227D possible
- Likely causes
- LikelySignal, supply or ground wire to sensor C damaged
- PossibleConnector at the intake pressure sensor loose or corroded
- PossibleSensor C electronics failed
- RareEngine controller software fault
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.