U068A code meaning
Lost Communication With Barometric Pressure Sensor C
Network system Generic code U06xx codes Check engine light
What U068A means
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.
U068A at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U068A
- Check engine light after two trips
- Bank 1 fueling less precise
- Accompanying pressure codes P227B to P227D possible
Common causes of U068A
- Most likelySignal, supply or ground wire to sensor C damaged
- PossibleConnector at the intake pressure sensor loose or corroded
- PossibleSensor C electronics failed
- Less likelyEngine controller software fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Baro sensor cVehicle bus wiring
What each part of U068A means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 8A | The exact fault in that area. |
What to do next
- Note U068A and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U068A
What does U068A mean?
U068A means "Lost Communication With Barometric Pressure Sensor C". Barometric sensor C appears in two very different layouts. It is a generic code, so it means the same on every make.
Is it safe to drive with U068A?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will U068A fail an emissions test?
Yes, it can. U068A is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U068A to fix?
Difficulty: medium. A typical repair takes 0.3 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will U068A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.