U0614: Lost Communication With Intake Air Temperature Sensor 2 Bank 2

What it means

The vehicle bus reports loss of communication with smart IAT sensor 2 on bank 2 (typically post-intercooler). Charge-air density correction reverts to a substitute value.

At a glance

• Usually lights the warning light of the system that lost communication
• Affects emissions; the car can fail an emissions test

How it works

The smart intake air temperature sensor 2 on bank 2 typically measures charge air after the intercooler and reports it over the vehicle communication bus. U0614 sets when messages from this bank 2 post-intercooler sensor are lost, so the control module may use a substitute value for charge-air density correction.

Common causes

Most likely first.

1. Bus wiring open or shorted
2. Module without power or ground
3. Module failed

Symptoms

• Multiple warning lights may illuminate
• Affected modules may go into limp mode or shut down
• Specific functions inoperative depending on module
• Diagnostic tools may show communication faults

How to diagnose it

1. Record freeze-frame data and check all modules for related communication codes to determine whether the problem is limited to bank 2 sensor 2.
2. Compare bank 2 IAT sensor 2 live data with its upstream reading and corresponding bank 1 readings to spot a missing or implausible post-intercooler value.
3. Inspect the bank 2 sensor 2 connector and wiring along the charge-air route for corrosion, chafing, heat damage, or moisture.
4. Check power and ground at the bank 2 sensor 2 module according to the manufacturer's wiring information.
5. Test the sensor's communication circuit for opens or shorts following the manufacturer's procedure and repair any damage.
6. If the wiring and supply connections are sound, verify communication at the bank 2 sensor 2 module before considering replacement.

Common fixes

• Reconnect and secure the bank 2 IAT sensor 2 connector.
• Clean corrosion or repair damaged terminals at the bank 2 sensor 2 connector.
• Repair an open, short, or damaged section in the bank 2 sensor communication wiring.
• Restore the sensor module's power or ground connection.
• Replace the bank 2 IAT sensor 2 module if it fails testing after its circuit is verified.

Can I keep driving?

A short, gentle trip may be possible if the engine runs normally and no temperature warnings appear, but arrange diagnosis soon because the post-intercooler air reading is unavailable for charge-air correction. Stop if the engine overheats, loses power, or enters limp mode.