AutoCodes – GMC – P02E9 2018 GMC Sierra

P02E9 2018 GMC Sierra Code - Diesel Intake Air Flow Position Sensor Circuit High

Quick Answer

The Throttle Body Assembly contains a contact-less inductive throttle position sensing element that is managed by a customized integrated circuit. Common causes include Faulty Throttle Body Assembly, Throttle Body Assembly harness is open or shorted, Throttle Body Assembly 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: P02E9 2018 GMC Sierra indicates Diesel Intake Air Flow Position Sensor Circuit High.
Common causes: Common causes include Faulty Throttle Body Assembly, Throttle Body Assembly harness is open or shorted, Throttle Body Assembly 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 188

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 Jun 10, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P02E9 2018 GMC Sierra Description

The Throttle Body Assembly contains a contact-less inductive throttle position sensing element that is managed by a customized integrated circuit. The throttle position sensor is mounted within the throttle body assembly and is not serviceable. The Engine Control Module (ECM) supplies the throttle body with a 5 V reference circuit, a low reference circuit. The asynchronous signal means communication is only going from the throttle body to the ECM. The throttle body cannot receive data from the ECM over the signal/serial data circuit. The throttle position sensor provides a signal voltage that changes relative to the throttle blade angle. The throttle position sensor information is transmitted between the throttle body and the ECM on the signal/serial data circuit. The ECM decodes the serial data signal and is used as voltages for throttle position sensor 1 and 2. The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the throttle valve position sensor SENT signal voltage is greater than a calibrated threshold for 0.5 s.

OBDII Code P02E9 2018 GMC Sierra - Diesel Intake Air Flow Position Sensor Circuit High - AutoCodes.com — P02E9 2018 GMC Sierra Code - Diesel Intake Air Flow Position Sensor Circuit High

What does this mean?

What are the Possible Causes of the DTC P02E9 2018 GMC Sierra?

Faulty Throttle Body Assembly
Throttle Body Assembly harness is open or shorted
Throttle Body Assembly circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P02E9 2018 GMC Sierra?

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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P02E9 2018 GMC Sierra 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 P02E9 2018 GMC Sierra Code

1. What does the OBDII code P02E9 mean on a 2018 GMC Sierra?

P02E9 indicates a "Diesel Intake Air Flow Position Sensor Circuit High," meaning the intake air flow position sensor is reading a voltage or signal higher than expected.

2. What are the common symptoms of code P02E9 on a 2018 GMC Sierra?

Symptoms may include reduced engine power, poor acceleration, increased fuel consumption, black smoke from the exhaust, or the check engine light being illuminated.

3. What causes the P02E9 code to appear on a 2018 GMC Sierra?

Common causes include a faulty intake air flow position sensor, damaged or corroded wiring or connectors, a malfunctioning throttle valve, or a problem with the engine control module (ECM).

4. Can I drive my 2018 GMC Sierra with the P02E9 code?

Driving with this code is not recommended as it can lead to poor engine performance, reduced fuel efficiency, and potential damage to the engine or emissions system.

5. How do I diagnose the P02E9 code on my 2018 GMC Sierra?

Start by using an OBDII scanner to confirm the code. Then inspect the intake air flow position sensor, wiring, and connectors for damage or corrosion. Test the sensorâ€™s voltage output with a multimeter if necessary.

6. How do I fix the P02E9 code on a 2018 GMC Sierra?

Repairs may involve replacing the intake air flow position sensor, repairing or replacing damaged wiring, cleaning the throttle body, or updating/reprogramming the ECM if needed.

7. How much does it cost to repair the P02E9 code on a 2018 GMC Sierra?

The cost can vary but typically ranges from $100 to $300 for diagnosing and replacing the intake air flow position sensor. Additional costs may apply if other components are involved.

8. Can a dirty throttle body cause the P02E9 code on a 2018 GMC Sierra?

Yes, a dirty or clogged throttle body can interfere with the intake air flow position sensor, potentially triggering the P02E9 code.

9. Will clearing the P02E9 code with a scanner fix the issue?

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

10. Is the P02E9 code related to the Mass Air Flow (MAF) sensor on a 2018 GMC Sierra?

While the P02E9 code specifically refers to the intake air flow position sensor, issues with the MAF sensor or related systems can indirectly impact airflow readings and should also be checked.