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U0612 Lost Communication With Intake Air Temperature Sensor 1 Bank 2

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

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.

Likely causes

Wiring fault on the bank 2 intake sensor branch

Bank 2 temperature sensor or its host sensor failed (on Ford the air flow sensor B)

Corroded connector on the bank 2 intake

Symptoms

Check engine light
Little effect on driving; with Ford's air flow sensor B reduced response possible

Repair estimate

DifficultyEasyDIY possible

Parts and labour€30–350

Time0.3–1.5 h

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

Parts involved

iat sensor 1 bank 2sensor wiring

References: gsi.ext.gm.com, fordservicecontent.com.