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U0614 — Lost Communication Intake Air Temperature Sensor 2 Bank 2

Generic OBD-II · all makesNetwork / communication

U0614 means the engine control module has lost communication with the intake air temperature (IAT) sensor labeled "2" on bank 2. It is a network or circuit fault rather than a sensor-performance fault, so the root cause is usually an open circuit, connector issue, or a failed sensor rather than a bad computer.

Symptoms

What causes it — most likely first

1. Faulty IAT sensor 2 bank 2

The sensor's internal electronics, communication circuit, or terminal connection can fail, preventing the module from receiving data even though the harness is intact.

2. Wiring or connector fault

Open, shorted, chafed, corroded, or backed-out pins in the harness between the sensor and the control module are common causes of lost communication.

3. Power or ground supply problem

A blown fuse, poor ground eyelet, damaged reference-voltage circuit, or low system voltage can stop a smart sensor from communicating.

4. Network bus line fault

If the sensor communicates over a shared serial bus such as LIN or CAN, an open or short in that bus, a missing termination resistor, or a faulty neighboring module can interrupt communication.

5. Related sensor/module integration failure

On some designs the IAT reading is reported through another assembly; if that host sensor or sub-module fails, the ECM may log U0614 for the temperature message.

6. PCM/ECM internal fault

A rare cause is a damaged communication port inside the PCM/ECM; this should only be considered after the sensor, wiring, power, and bus integrity have been verified.

How it's diagnosed

  1. Confirm the code with a scan tool, record freeze-frame data, clear the code, and retest under the failure conditions to see if it returns.
  2. Locate IAT sensor 2 bank 2 and inspect its connector and pigtail for corrosion, contamination, bent or pushed-out pins, and harness chafing near hot or moving components.
  3. Using the manufacturer wiring diagram, check the sensor's power, ground, and signal/communication circuits for correct voltage, continuity to the module, and shorts to power or ground.
  4. If the circuit is good, test or substitute the sensor and verify the temperature reading matches ambient conditions or responds normally to hand warmth.
  5. If the sensor is on a shared serial bus, check bus voltage, waveform, and termination; look for related U-codes that point to a broader network issue.
  6. Only consider PCM/ECM replacement or reprogramming after all wiring, connector, power, sensor, and network tests have ruled out other causes.

Code facts & related codes

SystemNetwork / communication
StandardizationSAE generic — identical on every make
Related codesU0610 — Lost Communication Mass Volume Air FloU0611 — Lost Communication Intake Air TemperatU0612 — Lost Communication Intake Air TemperatU0613 — Lost Communication Intake Air TemperatU0615 — Lost Communication Engine Coolant BypaU0616 — Lost Communication Engine Coolant Bypa

Frequently asked

Does U0614 mean the IAT sensor itself is bad?

Not necessarily. U0614 indicates a communication loss, which can be caused by a bad sensor, a wiring or connector problem, a power/ground issue, or a network fault. The sensor and circuit must both be tested.

Can I keep driving with code U0614?

Usually the vehicle remains drivable for short distances, but the engine may substitute a default temperature value, which can affect fuel trim, performance, and emissions.

Should I replace the PCM/ECM for U0614?

Usually no. PCM failure is a rare cause of this specific communication code. Most repairs involve the sensor, connector, wiring, or power/ground circuit. Only consider the PCM after thorough electrical and network diagnosis.

Why is an intake air temperature sensor bank-specific?

Some engines, particularly those with dual intake paths, twin turbochargers, or split charge-air coolers, use separate IAT sensors for each bank. Sensor 2 bank 2 monitors the intake air temperature on that side of the engine.