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P1187 Jeep Code - Throttle Inlet Pressure/MAP Correlation

Quick Answer

The P1187 Jeep diagnostic trouble code (DTC) indicates a problem with the correlation between the throttle inlet pressure and the Manifold Absolute Pressure (MAP) sensor. Common causes include Faulty MAP sensor, Vacuum leak in the intake system, Clogged air filter. 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
P1187 Jeep indicates Throttle Inlet Pressure/MAP Correlation.
Common causes
Common causes include Faulty MAP sensor, Vacuum leak in the intake system, Clogged air filter.
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 P1187 Jeep Description

The P1187 Jeep diagnostic trouble code (DTC) indicates a problem with the correlation between the throttle inlet pressure and the Manifold Absolute Pressure (MAP) sensor. The throttle inlet pressure refers to the pressure in the intake manifold before the throttle body, while the MAP sensor measures the pressure within the intake manifold. When these two values do not align correctly, it can lead to performance issues in the vehicle.

OBDII Code P1187 Jeep - Throttle Inlet Pressure/MAP Correlation
P1187 Jeep Code - Throttle Inlet Pressure/MAP Correlation

Common Causes of P1187 Jeep

  1. Faulty MAP sensor
  2. Vacuum leak in the intake system
  3. Clogged air filter
  4. Malfunctioning throttle body
  5. Issues with the intake manifold gasket

Symptoms of P1187 Jeep

  1. Rough idling
  2. Hesitation or lack of response when accelerating
  3. Decreased fuel efficiency
  4. Engine stalling
  5. Check Engine Light illuminated on the dashboard

How to Fix P1187 Jeep

  1. Diagnose the issue using a diagnostic scanner to pinpoint the exact cause of the correlation problem.
  2. Inspect the MAP sensor for any signs of damage or malfunction, and replace if necessary.
  3. Check for vacuum leaks in the intake system and repair or replace any damaged hoses or gaskets.
  4. Clean or replace the air filter to ensure proper airflow into the engine.
  5. Inspect the throttle body for any obstructions or malfunctions and clean or replace as needed.

Cost to Fix P1187 Jeep

The typical repair costs for addressing a P1187 Jeep code can range from $100 to $500, depending on the specific cause of the issue and the cost of parts and labor. It is important to note that diagnosis time and labor rates at auto repair shops can vary, so it is advisable to consult with a professional technician for a more accurate estimate based on your vehicle's make and model.

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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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