AutoCodes – GMC – P2438 GMC

P2438 GMC Code - Secondary Air Injection System Pressure Sensor Circuit High Voltage Bank 2

Quick Answer

The secondary air injection system aids in the reduction of hydrocarbon emissions during a cold start. Common causes include Faulty Secondary Air Injection System Pressure Sensor, Secondary Air Injection System Pressure Sensor harness is open or shorted, Secondary Air Injection System Pressure Sensor 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: P2438 GMC indicates Secondary Air Injection System Pressure Sensor Circuit High Voltage Bank 2.
Common causes: Common causes include Faulty Secondary Air Injection System Pressure Sensor, Secondary Air Injection System Pressure Sensor harness is open or shorted, Secondary Air Injection System Pressure Sensor 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 884

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 25, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2438 GMC Description

The secondary air injection system aids in the reduction of hydrocarbon emissions during a cold start. The electric air pump forces fresh air into the exhaust stream in order to accelerate the catalyst operation. Secondary air injection pressure sensors, which are integral to the shutoff and check valves, are used to monitor the air flow from the secondary air injection pump. The Engine Control Module (ECM) supplies voltage to the 5 V reference circuits and provides a ground for the low reference circuits. The sensors provide a signal voltage to the ECM relative to the pressure changes within the secondary air injection system.
The Diagnostic Trouble Code (DTC) will set when the ECM detects that the corresponding bank 2 secondary air injection pressure sensor signal is out of specifications.

OBDII Code P2438 GMC - Secondary Air Injection System Pressure Sensor Circuit High Voltage Bank 2 - AutoCodes.com — P2438 GMC Code - Secondary Air Injection System Pressure Sensor Circuit High Voltage Bank 2

What does this mean?

What are the Possible Causes of the DTC P2438 GMC?

Faulty Secondary Air Injection System Pressure Sensor
Secondary Air Injection System Pressure Sensor harness is open or shorted
Secondary Air Injection System Pressure Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2438 GMC?

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 P2438 GMC 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.

Need more information about the P2438 GMC code?

Need more information on how to fix the P2438 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P2438 GMC Code

1. What are the common symptoms of OBDII code P2438 in a GMC vehicle?

- Common symptoms include the check engine light coming on, decreased engine performance, rough idling, and potential engine stalling.

2. What could cause the OBDII code P2438 to trigger in a GMC vehicle?

- The code P2438 is commonly triggered by a faulty secondary air injection system pressure sensor, wiring issues, or a malfunctioning engine control module.

3. How serious is the OBDII code P2438 in a GMC vehicle?

- While the code itself may not cause immediate harm, it can lead to increased emissions, decreased fuel efficiency, and potential damage to the catalytic converter over time if left unresolved.

4. How can I diagnose the OBDII code P2438 in my GMC vehicle?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the secondary air injection system components, and testing the pressure sensor for proper function.

5. What are some repair tips for fixing the OBDII code P2438 in a GMC vehicle?

- Repair tips may include checking and replacing the secondary air injection system pressure sensor, repairing any damaged wiring, and ensuring proper connection to the engine control module.

6. Can I drive my GMC vehicle with the OBDII code P2438?

- It is generally not recommended to drive for an extended period with the code P2438 present, as it can lead to potential engine performance issues and increased emissions.

7. How much does it typically cost to repair the OBDII code P2438 in a GMC vehicle?

- The cost of repair can vary depending on the root cause of the issue, but it may range from $200 to $500 for parts and labor.

8. Will resetting the check engine light resolve the OBDII code P2438 in my GMC vehicle?

- Resetting the check engine light may temporarily clear the code, but it will not fix the underlying issue causing the code to trigger.

9. Can a DIY enthusiast fix the OBDII code P2438 in a GMC vehicle?

- Depending on the level of expertise, a DIY enthusiast may be able to address the code by inspecting and replacing the secondary air injection system pressure sensor themselves.

10. How often does the OBDII code P2438 occur in GMC vehicles?

- The OBDII code P2438 related to the secondary air injection system pressure sensor circuit high voltage in Bank 2 is a relatively uncommon issue in GMC vehicles, but it can occur due to various factors such as sensor failure or wiring problems.