Code Definition

P1191 — Intake Air Temperature Sensor Signal Intermittent

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Chrysler

About P1191

P1191 is a manufacturer-specific powertrain diagnostic trouble code recorded for Chrysler vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1191 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1191 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The intake air temperature (IAT) sensor is a thermistor that reports the temperature of air entering the engine to the powertrain control module (PCM), which uses this value to fine tune fuel delivery, ignition timing, and cold start enrichment. DTC P1191 sets when the PCM detects an intermittent or erratic IAT signal, meaning the voltage drops in and out or jumps around rather than changing smoothly with air temperature. On many Chrysler applications the IAT sensor is integrated into the intake air or MAP sensor assembly, so a poor connection or chafed wire in that circuit is a common trigger...

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