What Does P0097 Mean?
The ECM has detected a low voltage condition on the intake air temperature sensor 2 circuit on bank 1. Since most IAT sensors are negative temperature coefficient (NTC) thermistors, low voltage indicates high resistance, which corresponds to an extremely low (implausible) temperature reading. This is typically caused by an open circuit in the sensor or its wiring. The ECM will use a default value, but fuel delivery may be inaccurate.
Common Causes
35%
Open circuit in the IAT sensor 2 wiring (broken wire or disconnected connector)
30%
Failed IAT sensor 2 with open-circuit thermistor element
20%
Corroded or pushed-back pin in the sensor connector causing an open circuit
10%
Damaged 5V reference circuit or signal wire at the ECM side
5%
Sensor not fully seated in the intake manifold or intercooler pipe
Diagnostic Steps
1
Check the IAT sensor 2 PID value. A reading of approximately -40F (-40C) typically indicates an open circuit (maximum resistance reading).
2
Inspect the IAT sensor 2 connector. Ensure it is fully seated and locked. Check for pushed-back pins, corrosion, or damaged locking tab.
3
Disconnect the sensor and measure resistance across the terminals. An OL (open loop) reading confirms a failed sensor. Compare to spec (typically 5,000-10,000 ohms at 68F/20C).
4
With the sensor disconnected, check for 5V reference voltage and verify ground continuity at the harness connector. Missing reference voltage indicates a wiring or ECM issue.
5
If the sensor and connector are good, check wire continuity from the sensor connector back to the ECM connector. An open wire will need to be repaired or replaced.
Estimated Repair Cost
$40 - $200
Parts + labor, varies by vehicle and location
The ECM has detected a low voltage condition on the intake air temperature sensor 2 circuit on bank 1. Since most IAT sensors are negative temperature coefficient (NTC) thermistors, low voltage indicates high resistance, which corresponds to an extremely low (implausible) temperature reading. This i...
The most common cause of P0097 (Intake Air Temperature Sensor 2 Circuit Low Bank 1) is: Open circuit in the IAT sensor 2 wiring (broken wire or disconnected connector)
Typical repair costs for P0097 range from $40 to $200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. The ECM will use a default substitute value for air temperature calculations. Fuel mixture may be slightly off, but the engine will run. On turbocharged vehicles, boost may be limited. No immediate safety concern.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0097 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Management / Sensor System
Difficulty
Type
Generic (SAE)
Recommended Tools
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