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U0613 — Lost Communication Intake Air Temperature Sensor 2 Bank 1

Generic OBD-II · all makesNetwork / communication

U0613 indicates that the Powertrain Control Module (PCM) has lost communication with the Intake Air Temperature (IAT) sensor 2 on bank 1. The PCM cannot receive the sensor’s voltage signal, which is used to calculate air density for fuel control.

Symptoms

What causes it — most likely first

1. Open or short circuit in IAT sensor 2 wiring

Corroded connectors, broken wires, or pinched harnesses can interrupt the sensor signal.

2. Faulty IAT sensor 2 (bank 1)

The sensor’s internal element can fail, producing no voltage or erratic readings.

3. Poor grounding or high resistance in the sensor circuit

A bad ground strap or high‑resistance splice can cause intermittent communication loss.

4. PCM input pin failure

A rare internal failure of the PCM’s IAT sensor input can prevent the signal from being read.

How it's diagnosed

  1. Visually inspect the IAT sensor 2 wiring and connector for damage, corrosion, or loose pins.
  2. Measure sensor voltage at the connector with a multimeter while the engine is running; compare to specifications (typically 0.5‑4.5 V).
  3. Test continuity and resistance of the sensor wiring from connector to PCM to identify opens or shorts.
  4. If the sensor and wiring test normal, perform a PCM input pin test or swap the sensor with a known good unit to verify the PCM.
  5. Clear the code and perform a drive cycle to confirm whether the issue returns.

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 TemperatU0614 — Lost Communication Intake Air TemperatU0615 — Lost Communication Engine Coolant BypaU0616 — Lost Communication Engine Coolant Bypa

Frequently asked

Can I fix U0613 by simply resetting the code?

Resetting the code may turn off the Check Engine Light temporarily, but the underlying communication loss will cause the code to return if the fault is not repaired.

Do I need to replace the PCM for this code?

Replacing the PCM is rarely required for U0613. In most cases the problem lies with the sensor, its wiring, or a poor connection. PCM replacement should be considered only after confirming the sensor and circuit are functional.

Will a bad IAT sensor affect emissions?

Yes. Incorrect intake air temperature data can cause the engine to run too rich or too lean, leading to higher emissions and possible failure of emissions tests.

Is it safe to drive with this code active?

The vehicle will usually run, but performance may be degraded, fuel economy reduced, and emissions increased. It is advisable to diagnose and repair the issue promptly.