Code
U0613
Generic
U — Network/User
Lost Communication With Intake Air Temperature Sensor 2 Bank 1
Views:
UK: 16
EN: 32
RU: 22
AI status
Completed
Completed
100%
Causes
- Open or short in sensor signal, reference, or ground circuit
- Faulty IAT sensor/module (IAT Sensor 2, Bank 1)
- Corroded or loose connector or pins at sensor or control module
- Faulty power or ground to the sensor/module (blown fuse, poor chassis ground)
- Damaged wiring harness (chafing, water intrusion)
- CAN/vehicle network fault (bus wiring, termination, or another module affecting communication)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- No IAT Sensor 2 (Bank 1) data visible on scan tool or frozen/erratic values
- Poor cold-start drivability or abnormal fuel trim (rich/lean)
- Reduced engine performance or limp-home behavior depending on vehicle strategy
- Possible other communication or sensor-related codes present
What to check
- Read and record U0613 and any related codes and freeze-frame data with a capable scan tool
- Confirm which module is the data source for IAT Sensor 2 (direct analog sensor vs. networked sensor/module) using factory wiring diagrams
- Check for other U-codes or network-related codes (CAN bus errors, lost comms with other modules)
- Visually inspect wiring harness and connectors for damage, corrosion, or water ingress at sensor and relevant modules
- Verify power and ground to the sensor (check fuses, relays, and ground straps)
- Attempt to view live IAT Sensor 2 data on scan tool; wiggle harness/connectors to see if data appears or changes
Signal parameters
- Typical IAT sensor signal (if analog thermistor): reference voltage ~5 V (check vehicle spec), signal voltage range roughly 0.5–4.5 V depending on temperature (consult factory values)
- Thermistor behavior: resistance decreases as temperature increases (refer to manufacturer resistance vs. temperature table)
- CAN/diagnostic bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (differential pair ~0 V idle, ±2.5 V active); verify proper termination resistances (typically 60 ohm total)
- Expected continuity: low resistance from sensor ground to chassis ground; signal circuit continuity from sensor pin to PCM/gateway pin (consult wiring diagram for pin numbers)
Diagnostic algorithm
- Connect a capable scan tool, record the code, freeze frame, and related codes; verify whether IAT Sensor 2 data is present or absent in live data.
- Inspect wiring and connectors at IAT Sensor 2 and at the target control module for corrosion, bent pins, or water damage; repair obvious issues.
- With ignition ON (engine OFF), measure reference voltage and signal voltage at the sensor connector. Compare to specs; if absent, trace fuse/power/ground to source.
- Check sensor ground continuity to chassis ground and continuity of signal wire to the receiving module pin using a meter. Repair open/shorts as found.
- If sensor is a simple thermistor, measure sensor resistance at ambient temperature and compare to expected resistance table. Replace sensor if out of tolerance.
- If the sensor communicates over a network, check CAN bus health: measure CAN_H/CAN_L voltages, check termination resistance, and scan for other lost-communication nodes.
- Perform a wiggle test on harness and connectors while monitoring live data to find intermittent faults.
- If wiring and sensor check good, update module software if available and supported, then clear codes and test drive to see if code returns.
- If code persists after wiring and sensor replacement, consider module-level failure and follow manufacturer procedures for module testing or replacement.
Likely causes
- Broken/disconnected wiring between PCM (or gateway module) and IAT Sensor 2
- Corroded connector at the sensor causing intermittent/no connection
- Failed IAT sensor thermistor or local module electronics
- CAN bus fault or missing network node causing the sensor’s data to disappear
Fault status
Status
Lost communication with Intake Air Temperature Sensor 2 (Bank 1). No valid data received from the sensor node — check sensor, wiring, power/ground, and vehicle network for faults.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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