Faulty inlet air temperature sensor with an internal short; Sensor signal wire chafed and shorted to ground or to the sensor return; Corroded, damaged or contaminated sensor connector causing a low signal; Damaged wiring loom between the sensor and the powertrain control module; Faulty sensor reference or ground circuit at the module; Internal fault in the powertrain control module.

P1192

Inlet Air Temp. Circuit Low.

Jeep
Powertrain
Manufacturer code
Low severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
1: AreaFuel and air metering
92: FaultThe specific fault in that area

What it means

P1192 on a Jeep means the powertrain control module has seen the inlet air temperature sensor circuit voltage fall below the expected range. A low voltage reading suggests a short to ground or a sensor fault, and the module reads it as an implausibly high air temperature. The exact sensor location and the way the module sets the code can vary by model and engine.

Symptoms

Malfunction indicator lamp on
Rough or unstable idle
Hesitation or reduced power under acceleration
Poor fuel economy
Hard starting, particularly when cold

Possible causes

Faulty inlet air temperature sensor with an internal shortlikely
Sensor signal wire chafed and shorted to ground or to the sensor returnlikely
Corroded, damaged or contaminated sensor connector causing a low signalpossible
Damaged wiring loom between the sensor and the powertrain control modulepossible
Faulty sensor reference or ground circuit at the modulerare
Internal fault in the powertrain control modulerare

How to diagnose

Read all stored and pending codes and note the freeze frame data, including engine temperature and load when the code set.
Check live data for inlet air temperature on a cold engine; compare it with the coolant temperature and ambient temperature. An implausibly high or fixed value points to a short.
Inspect the sensor, its connector and the nearby wiring for chafing, heat damage, water ingress and corrosion.
Unplug the sensor with the ignition on and check whether the reading changes; a reading that moves to a low or default value suggests the sensor was at fault, and one that stays shows a wiring short.
Measure the sensor resistance and compare it with the specification for your model and engine at the current temperature.
Check the signal wire for a short to ground and for continuity back to the module, with the module and sensor disconnected.
Check the reference voltage and ground supply at the sensor connector against the wiring diagram.
Wiggle the loom while watching live data to find any intermittent short.

How to fix

Replace the inlet air temperature sensor if its resistance is out of specification or the reading is implausible.
Repair or replace the shorted or chafed wiring, and secure the loom away from sharp edges and heat.
Clean or replace the corroded or damaged connector terminals and seal the connector.
Repair any fault on the reference or ground circuit.
Only after all wiring and sensor checks pass, diagnose and, if confirmed faulty, replace or repair the powertrain control module.

Can I keep driving?

Low severity

The car can usually be driven, as the module substitutes a default air temperature value. Book it in soon, because fuelling may be slightly off and economy and driveability can suffer.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.