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U066E Lost Communication With Charge Air Cooler Temperature Sensor Bank 2

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

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.

Likely causes

Wiring to the bank 2 charge air sensor damaged, often routed near the hot side

Connector at the bank 2 charge air pipe loose or oily

Bank 2 sensor electronics failed

Symptoms

Check engine light
Possible additional bank correlation code (P007F)
Mostly unchanged driving behaviour

Repair estimate

DifficultyEasyDIY possible

Parts and labour€40–350

Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

cac temp sensor bank 2vehicle bus wiring

References: law.cornell.edu, en.wikipedia.org, infineon.com.