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P1199 Dodge Code - Radiator Temp Sensor Input Too Low

Quick Answer

The P1199 code for Dodge vehicles indicates that the Radiator Temperature Sensor Input is too low. Common causes include Faulty Radiator Temperature Sensor: The sensor itself may be malfunctioning and providing inaccurate temperature readings, Wiring Issues: There could be a wiring problem in the sensor circuit, such as a short or open circuit, disrupting the signal to the ECM, Malfunctioning ECM: A faulty engine control module may not be processing the sensor input correctly, leading to the P1199 code. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1199 Dodge indicates Radiator Temp Sensor Input Too Low.
Common causes
Common causes include Faulty Radiator Temperature Sensor: The sensor itself may be malfunctioning and providing inaccurate temperature readings, Wiring Issues: There could be a wiring problem in the sensor circuit, such as a short or open circuit, disrupting the signal to the ECM, Malfunctioning ECM: A faulty engine control module may not be processing the sensor input correctly, leading to the P1199 code.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1199 Dodge Description

The P1199 code for Dodge vehicles indicates that the Radiator Temperature Sensor Input is too low. This sensor is responsible for monitoring the temperature of the engine coolant and sending this information to the engine control module (ECM). The ECM uses this data to adjust fuel delivery and ignition timing to ensure optimal engine performance and efficiency. When the sensor input is too low, it means that the temperature reading from the sensor is outside of the expected range, which can lead to various issues with the vehicle's operation.

OBDII Code P1199 Dodge - Radiator Temp Sensor Input Too Low
P1199 Dodge Code - Radiator Temp Sensor Input Too Low

Common Causes of P1199 Dodge

  1. Faulty Radiator Temperature Sensor: The sensor itself may be malfunctioning and providing inaccurate temperature readings.
  2. Wiring Issues: There could be a wiring problem in the sensor circuit, such as a short or open circuit, disrupting the signal to the ECM.
  3. Malfunctioning ECM: A faulty engine control module may not be processing the sensor input correctly, leading to the P1199 code.
  4. Coolant Leak: A coolant leak near the sensor can affect its readings and trigger the code by altering the temperature data received.

Symptoms of P1199 Dodge

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Poor Fuel Economy: A faulty radiator temperature sensor can lead to incorrect fuel delivery adjustments, resulting in decreased fuel efficiency.
  3. Engine Overheating: Inaccurate temperature readings can cause the engine to overheat due to incorrect cooling system operation.
  4. Rough Idling: The engine may exhibit rough idling or stalling as a result of incorrect temperature data affecting fuel and ignition timing.
  5. Reduced Engine Power: The vehicle may experience a loss of power or sluggish acceleration due to improper engine adjustments based on faulty sensor input.

How to Fix P1199 Dodge

  1. Diagnostic Testing: Begin by performing diagnostic testing to confirm the P1199 code and identify the specific cause of the issue.
  2. Replace Radiator Temperature Sensor: If the sensor is found to be faulty, replace it with a new sensor to restore accurate temperature readings.
  3. Check Wiring: Inspect the wiring harness for any damage or connectivity issues and repair or replace any faulty wiring.
  4. ECM Inspection: Verify the functionality of the engine control module to ensure it is correctly processing sensor input.
  5. Coolant System Inspection: Check for any coolant leaks near the sensor and repair as necessary to prevent future sensor inaccuracies.

Cost to Fix P1199 Dodge

The typical cost estimate for resolving a P1199 code on a Dodge vehicle can range from $150 to $300, depending on the specific cause of the issue and the cost of parts and labor. This estimate may vary based on the location of the repair, the vehicle's make and model, and the engine type. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, with average rates falling between $80 and $150 per hour. It is advisable to consult local rates to obtain a more accurate estimate for this repair.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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