U066E code meaning
Lost Communication With Charge Air Cooler Temperature Sensor Bank 2
Network system Generic code U06xx codes Check engine light
What U066E means
A bank 2 charge air temperature only exists on V or boxer engines that run one turbocharger and one intercooler per cylinder bank. There the controller can compare both sides, and a mismatch belongs to P007F, the bank 1/bank 2 correlation code. U066E is the digital-link failure for the bank 2 sensor: its frames are missing or unusable, so that comparison and any per-bank boost correction lose their input. None of the Ford or GM OBD summaries examined shows a bank 2 charge air sensor at all, let alone a digital one, so no manufacturer can be named; analog faults would be P00A0 to P00A4. CARB's (f)(7.2.4) undercooling monitor applies per cooler. The controller substitutes the bank 1 value or a model; the driver rarely notices more than the warning lamp.
U066E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U066E
- Check engine light
- Possible additional bank correlation code (P007F)
- Mostly unchanged driving behaviour
Common causes of U066E
- Most likelyWiring to the bank 2 charge air sensor damaged, often routed near the hot side
- PossibleConnector at the bank 2 charge air pipe loose or oily
- PossibleBank 2 sensor electronics failed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Cac temp sensor bank 2Vehicle bus wiring
What each part of U066E means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6E | The exact fault in that area. |
What to do next
- Note U066E 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 U066E
What does U066E mean?
U066E means "Lost Communication With Charge Air Cooler Temperature Sensor Bank 2". A bank 2 charge air temperature only exists on V or boxer engines that run one turbocharger and one intercooler per cylinder bank. It is a generic code, so it means the same on every make.
Is it safe to drive with U066E?
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 U066E fail an emissions test?
Yes, it can. U066E 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 U066E to fix?
Difficulty: easy. A typical repair takes 0.3 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will U066E clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.