U0612 code meaning
Lost Communication With Intake Air Temperature Sensor 1 Bank 2
Network system Generic code U06xx codes Check engine light
What U0612 means
Bank 2 needs its own intake temperature sensor only where the engine has two separate air paths, as on V engines with one air box and throttle per bank. U0612 is the lost-communication code for that sensor 1 of bank 2. GM's 23OBDG07/24OBDG07 treat it as the bank 2 twin of U0611: the second bank's temperature message is missing, or its line is reported stuck high or low, and the MIL follows after two trips. Ford's 2024 gasoline summary, however, assigns U0612 to communication with its digital air flow sensor B (lost for more than 5 s), so on Ford vehicles the code points to that meter instead. P00AA to P00AE cover the analog circuit. Without the value the controller substitutes a fixed temperature.
U0612 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0612
- Check engine light
- Little effect on driving; with Ford's air flow sensor B reduced response possible
Common causes of U0612
- Most likelyWiring fault on the bank 2 intake sensor branch
- PossibleBank 2 temperature sensor or its host sensor failed (on Ford the air flow sensor B)
- Less likelyCorroded connector on the bank 2 intake
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Iat sensor 1 bank 2Sensor wiring
What each part of U0612 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 12 | The exact fault in that area. |
What to do next
- Note U0612 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 U0612
What does U0612 mean?
U0612 means "Lost Communication With Intake Air Temperature Sensor 1 Bank 2". Bank 2 needs its own intake temperature sensor only where the engine has two separate air paths, as on V engines with one air box and throttle per bank. It is a generic code, so it means the same on every make.
Is it safe to drive with U0612?
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 U0612 fail an emissions test?
Yes, it can. U0612 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 U0612 to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will U0612 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.