U069C code meaning
Lost Communication With Exhaust Gas Temperature Sensor Bank 2 Sensor 3
Network system Generic code U06xx codes Check engine light
What U069C means
U069C refers to the third temperature probe in the bank 2 exhaust path, so it can only occur where each cylinder bank feeds its own aftertreatment line, as on some V engines. Such a probe is a digital unit that reports its reading as SENT or CAN frames; the code is stored when those frames stop or keep failing their checks. No manufacturer documents U069C publicly. GM's 2025 diesels have one bank and test only the bank 1 positions, declaring a probe lost after 19 bad samples within 25 and rating it Type A. Bentley's V8 bulletin 2065698/1 proves that digital bank 2 probes are in use, yet names only the first position (U0621). An analog probe at this spot reports through P2466 to P246A, and the fourth probe on bank 2 has U069D. The MIL and a postponed filter regeneration are the likely consequences.
U069C at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U069C
- Check engine light
- Filter regeneration on bank 2 postponed or blocked
- Probe shows no value in live data
Common causes of U069C
- Most likelySensor harness on the bank 2 exhaust side chafed or heat-damaged
- PossibleElectronics box of the probe failed
- PossibleProbe has lost its supply or ground
- Less likelyConnector corroded or not latched
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Egt sensor bank 2 sensor 3Vehicle bus wiring
What each part of U069C means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 9C | The exact fault in that area. |
What to do next
- Note U069C 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 U069C
What does U069C mean?
U069C means "Lost Communication With Exhaust Gas Temperature Sensor Bank 2 Sensor 3". U069C refers to the third temperature probe in the bank 2 exhaust path, so it can only occur where each cylinder bank feeds its own aftertreatment line, as on some V engines. It is a generic code, so it means the same on every make.
Is it safe to drive with U069C?
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 U069C fail an emissions test?
Yes, it can. U069C 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 U069C to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will U069C clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.