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DTC codes / Chrysler codes / P1193

P1193 · ChryslerInlet Air Temp Circuit High

P1193 on Chrysler vehicles indicates the powertrain control module (PCM) has detected an abnormally high voltage signal from the inlet air temperature (IAT) sensor circuit, which typically means the sensor is reading a colder-than-actual intake air temperature. The PCM sets this code when the IAT signal voltage exceeds the calibrated maximum for a set time, often due to an open circuit, faulty sensor, or wiring issue.

SystemPowertrain
Code typeChrysler specific
SeverityLow
Fix difficultyIntermediate
AreaFuel and air metering

Symptoms you may notice

  • Illumination of the check engine light (malfunction indicator lamp) on the dashboard.
  • Often no symptoms besides the warning light, especially in mild weather.
  • Rough idle or hesitation when the engine is cold, due to incorrect air-fuel mixture.
  • Poor fuel economy or increased emissions as the PCM enriches the mixture based on false cold-air reading.
  • In rare cases, a no-start condition or stalling if the signal is completely open.
  • Possible drivability issues in extreme cold, where the PCM may over-fuel.

Common causes, most likely first

  1. Faulty inlet air temperature sensor (IAT) itself, reading open or high resistance.
  2. Open or high-resistance wiring in the IAT signal circuit, including a broken wire or poor connection.
  3. Corroded or loose electrical connector at the IAT sensor or PCM.
  4. Damaged or shorted wiring harness causing an open circuit (less common than a sensor fault).
  5. PCM internal fault (rare, but possible if all other causes are ruled out).
  6. Intake air temperature sensor that is physically damaged or contaminated.
  7. Aftermarket air intake system that has disturbed the sensor mounting or wiring.

How to diagnose and fix it

  1. Visually inspect the IAT sensor and its connector for damage, corrosion, or loose pins; repair or replace as needed.
  2. Check the IAT sensor resistance with a multimeter and compare to the manufacturer's temperature-resistance chart; replace if out of specification.
  3. Measure voltage on the IAT signal circuit at the sensor connector with the key on, engine off; a high voltage (near 5V) indicates an open circuit.
  4. Perform a wiggle test on the wiring harness while monitoring IAT data on a scan tool to detect intermittent opens.
  5. Check continuity and resistance of the signal and ground circuits between the IAT sensor and PCM; repair any open or high-resistance wiring.
  6. If wiring and sensor are good, substitute a known-good sensor or simulate the signal with a resistor to see if the code clears.
  7. As a last resort, diagnose the PCM for internal faults, but only after confirming all external circuits are intact.

IAT sensor circuit quirks on Chrysler engines

  • A common misdiagnosis is replacing the IAT sensor when the real problem is a broken wire inside the insulation near the intake manifold, often caused by vibration or heat.
  • On many Chrysler vehicles, the IAT sensor is integrated into the mass airflow sensor (MAF), so a faulty MAF can set P1193 even if the IAT element itself is fine.
  • The PCM may use a default intake air temperature value when the circuit fails, allowing the engine to run but with reduced fuel economy and higher emissions.
  • P1193 can be set by a poor ground connection at the sensor or PCM, which is often overlooked during diagnosis.
  • Aftermarket air intake systems that relocate the IAT sensor can cause this code if the wiring is stretched or the sensor is exposed to abnormal heat.

Can I keep driving with P1193?

The vehicle is generally safe to drive with P1193 because the PCM substitutes a default temperature value, but you may experience reduced fuel economy and slightly higher emissions. Avoid towing heavy loads or aggressive driving until the fault is repaired, and address the issue promptly to prevent potential long-term catalyst damage from rich running.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Chrysler vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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