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Engine-Codes – Generic – P1142

P1142 Code - Load Calculation Cross Check Lower Limit Exceeded

Quick Answer

The P1142 diagnostic trouble code (DTC) indicates that the load calculation cross check lower limit has been exceeded in the vehicle. Common causes include Faulty mass airflow sensor, Dirty or clogged air filter, Vacuum leaks in the intake system. 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
P1142 indicates Load Calculation Cross Check Lower Limit Exceeded.
Common causes
Common causes include Faulty mass airflow sensor, Dirty or clogged air filter, Vacuum leaks in the intake system.
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 07, 2024
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Code P1142 Description

The P1142 diagnostic trouble code (DTC) indicates that the load calculation cross check lower limit has been exceeded in the vehicle. This code is typically associated with the engine control module (ECM) or powertrain control module (PCM) detecting a discrepancy between the calculated load value and the expected load value. The load calculation refers to the amount of air entering the engine, which is crucial for proper fuel delivery and combustion. When the lower limit is exceeded, it means that the calculated load is lower than what is expected, leading to potential issues with engine performance.

OBDII Code P1142 - Load Calculation Cross Check Lower Limit Exceeded
P1142 Code - Load Calculation Cross Check Lower Limit Exceeded

Common Causes of P1142

  1. Faulty mass airflow sensor
  2. Dirty or clogged air filter
  3. Vacuum leaks in the intake system
  4. Malfunctioning EGR valve
  5. Issues with fuel injectors or fuel pressure

Symptoms of P1142

  1. Reduced fuel efficiency
  2. Rough idling or unstable engine idle
  3. Hesitation or lack of power during acceleration
  4. Engine stalling or difficulty starting
  5. Illumination of the check engine light

How to Fix P1142

  1. Begin by performing a thorough inspection of the air intake system, including the air filter, mass airflow sensor, and throttle body. Clean or replace any components that are dirty or damaged.
  2. Check for vacuum leaks in the intake system using a smoke test or by visually inspecting hoses and connections. Repair or replace any leaking components.
  3. Test the EGR valve for proper operation and clean or replace it if necessary.
  4. Inspect the fuel injectors for clogs or leaks, and check fuel pressure to ensure it is within the manufacturer's specifications. Replace any faulty components as needed.
  5. Clear the DTC from the ECM/PCM memory using a scan tool and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P1142

The cost of repairing a P1142 code can vary depending on the specific cause of the issue and the labor rates in your area. In general, you can expect to pay anywhere from $100 to $500 for parts and labor. Keep in mind that additional diagnostic time may be required to pinpoint the exact cause of the problem, which could result in higher repair costs. It's advisable to consult with a trusted mechanic or auto repair shop for a more accurate estimate based on your vehicle's make and model.

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Code P1142 Information for Specific Makes

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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