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P1187 Chrysler Code - Throttle Inlet Pressure/MAP Correlation

Quick Answer

The P1187 Chrysler diagnostic trouble code (DTC) indicates a problem with the correlation between the throttle inlet pressure and the manifold absolute pressure (MAP) sensor in the vehicle. Common causes include Faulty throttle inlet pressure sensor, Malfunctioning MAP sensor, Wiring or connector issues. 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 Chrysler indicates Throttle Inlet Pressure/MAP Correlation.
Common causes
Common causes include Faulty throttle inlet pressure sensor, Malfunctioning MAP sensor, Wiring or connector issues.
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 Chrysler Description

The P1187 Chrysler diagnostic trouble code (DTC) indicates a problem with the correlation between the throttle inlet pressure and the manifold absolute pressure (MAP) sensor in the vehicle. The throttle inlet pressure sensor measures the pressure in the intake manifold, which is crucial for determining the correct air-fuel mixture for combustion in the engine. The MAP sensor, on the other hand, measures the pressure in the intake manifold relative to atmospheric pressure.

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

Common Causes of P1187 Chrysler

  1. Faulty throttle inlet pressure sensor
  2. Malfunctioning MAP sensor
  3. Wiring or connector issues
  4. Vacuum leaks in the intake system
  5. Engine computer system malfunction

Symptoms of P1187 Chrysler

  1. Rough idling or stalling: The engine may struggle to maintain a consistent idle speed or may stall unexpectedly.
  2. Decreased fuel efficiency: The vehicle may experience a drop in fuel economy due to incorrect air-fuel mixture.
  3. Loss of power: The engine may feel sluggish or unresponsive when accelerating.
  4. Check Engine Light: The P1187 code will trigger the Check Engine Light on the dashboard.
  5. Engine hesitation: The vehicle may hesitate or jerk during acceleration, indicating a lack of proper fuel delivery.

How to Fix P1187 Chrysler

  1. Perform a diagnostic scan: Use a scan tool to retrieve the specific trouble code and identify the underlying issue.
  2. Inspect the throttle inlet pressure sensor and MAP sensor: Check for any signs of damage or wear, and replace if necessary.
  3. Check wiring and connectors: Inspect the wiring harness and connectors for any loose connections, corrosion, or damage. Repair or replace as needed.
  4. Inspect for vacuum leaks: Check the intake system for any leaks that could be affecting pressure readings. Repair or replace any damaged components.
  5. Clear the code and test drive: Clear the DTC from the vehicle's computer system and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1187 Chrysler

The typical repair costs for addressing a P1187 Chrysler code can vary depending on the specific cause of the issue. In general, parts such as a new throttle inlet pressure sensor or MAP sensor can range from $50 to $200 each, while labor costs can add an additional $100 to $300 for diagnosis and repair. Overall, the total repair cost for this issue could range from $150 to $600. However, it's important to note that labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Additionally, costs may be higher at dealerships or in metropolitan areas, while independent shops may offer lower rates.

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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.

Frequently Asked Questions about P1187 Chrysler Code

1. What does OBDII code P1187 mean on a Chrysler vehicle?

P1187 indicates a correlation issue between the throttle inlet pressure sensor and the manifold absolute pressure (MAP) sensor, suggesting inconsistent or unexpected readings.

2. What are the common symptoms of code P1187 in a Chrysler?

Symptoms may include poor engine performance, reduced fuel efficiency, rough idling, hesitation during acceleration, and illuminated check engine light.

3. What causes the P1187 code to appear in a Chrysler?

Common causes include a malfunctioning MAP sensor, a faulty throttle inlet pressure sensor, wiring issues, vacuum leaks, or a problem with the powertrain control module (PCM).

4. Can a dirty throttle body cause the P1187 code?

Yes, a dirty or clogged throttle body can disrupt airflow readings, leading to a mismatch between the throttle inlet pressure and MAP sensor data.

5. How is the P1187 code diagnosed in a Chrysler?

A mechanic will use a scan tool to read live data, check the MAP and throttle inlet pressure sensor readings, inspect wiring and connectors, and look for vacuum leaks.

6. Is it safe to drive with the P1187 code on a Chrysler?

Driving with this code is not recommended, as it can lead to reduced performance and potentially cause further damage to the engine or sensors.

7. How do you fix the P1187 code on a Chrysler vehicle?

Repairs may include replacing a faulty MAP sensor or throttle inlet pressure sensor, repairing damaged wiring, cleaning the throttle body, or reprogramming the PCM if needed.

8. Can a vacuum leak trigger the P1187 code in a Chrysler?

Yes, a vacuum leak can cause incorrect pressure readings, leading to a correlation error between the throttle inlet pressure and MAP sensor.

9. How much does it cost to repair the P1187 code on a Chrysler?

Repair costs vary but may range from $150 to $400 depending on whether sensors, wiring, or other components need replacement or repair.

10. Will clearing the P1187 code solve the problem on a Chrysler?

Clearing the code may temporarily turn off the check engine light, but the underlying issue causing the code must be addressed to prevent it from returning.

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