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P042E Cadillac Code - Exhaust Gas Recirculation Closed Position Performance

Quick Answer

The Engine Control Module (ECM) uses the Exhaust Gas Recirculation (EGR) position sensor to determine the position of the EGR valve. Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation Valve harness is open or shorted, Exhaust Gas Recirculation Valve circuit poor electrical connection. 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: P042E Cadillac indicates Exhaust Gas Recirculation Closed Position Performance.
Common causes: Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation Valve harness is open or shorted, Exhaust Gas Recirculation Valve circuit poor electrical connection.
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.

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Code Popularity 1,512

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P042E Cadillac Description

The Engine Control Module (ECM) uses the Exhaust Gas Recirculation (EGR) position sensor to determine the position of the EGR valve. The ECM sends a reference voltage through the 5 V reference circuit to the EGR position sensor. The ECM provides a voltage return path for the sensor through the low reference circuit. A signal based on the EGR valve position is sent from the EGR sensor to the ECM. The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the desired position and the actual position of the EGR valve is greater than a calibrated threshold.

OBDII Code P042E Cadillac - Exhaust Gas Recirculation Closed Position Performance - AutoCodes.com — P042E Cadillac Code - Exhaust Gas Recirculation Closed Position Performance

What does this mean?

What are the Possible Causes of the DTC P042E Cadillac?

Faulty Exhaust Gas Recirculation (EGR) Valve
Exhaust Gas Recirculation Valve harness is open or shorted
Exhaust Gas Recirculation Valve circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P042E Cadillac?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P042E Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 P042E Cadillac Code

1. What does the OBDII code P042E mean on a Cadillac?

The P042E code indicates a problem with the Exhaust Gas Recirculation (EGR) system, specifically that the EGR valve is not functioning properly in its closed position.

2. What are the common symptoms of a P042E code on a Cadillac?

Symptoms may include poor engine performance, rough idling, reduced fuel efficiency, increased emissions, and the illumination of the check engine light.

3. What causes the P042E code to appear on a Cadillac?

Common causes include a faulty EGR valve, carbon buildup in the valve or passages, a malfunctioning EGR position sensor, or wiring issues in the EGR system.

4. Can I drive my Cadillac with a P042E code?

While the car may still be drivable, continuing to drive with this code can cause further damage to the EGR system or affect engine performance and emissions.

5. How do I fix the P042E code on my Cadillac?

Repairs may involve cleaning or replacing the EGR valve, repairing damaged wiring, or replacing a faulty EGR position sensor.

6. How much does it cost to fix a P042E code on a Cadillac?

The repair cost varies depending on the issue, but cleaning the EGR valve may cost $100â€“$300, while replacing it could range from $300â€“$600.

7. How can I prevent the P042E code from occurring on my Cadillac?

Regular maintenance, such as cleaning the EGR system and using high-quality fuel, can help prevent carbon buildup and EGR valve issues.

8. Can a clogged EGR valve trigger the P042E code on a Cadillac?

Yes, a clogged EGR valve can restrict proper movement and cause the system to fail in the closed position, triggering the code.

9. Will resetting the check engine light clear the P042E code on my Cadillac?

Resetting the light may temporarily clear the code, but the underlying issue must be resolved to prevent the code from returning.

10. Do I need a professional mechanic to fix a P042E code on a Cadillac?

While some fixes, like cleaning the EGR valve, can be done by experienced DIYers, diagnosing and repairing electrical or sensor-related issues may require a professional.