AutoCodes – GMC – P1A90 GMC

P1A90 GMC Code - 14 Volt Power Module Temperature Sensor 1 Performance

Quick Answer

The 14V Power Module also called the accessory DC power control module, constantly monitors system temperature to protect against overheat conditions. Common causes include Faulty 14 Volt Power Module, 14 Volt Power Module harness is open or shorted, 14 Volt Power Module 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: P1A90 GMC indicates 14 Volt Power Module Temperature Sensor 1 Performance.
Common causes: Common causes include Faulty 14 Volt Power Module, 14 Volt Power Module harness is open or shorted, 14 Volt Power Module 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 804

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 Feb 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1A90 GMC Description

The 14V Power Module also called the accessory DC power control module, constantly monitors system temperature to protect against overheat conditions. The module also monitors the function of the temperature sensors. These sensors are internal to the 14 V power module and are not serviced separately from the control module.

OBDII Code P1A90 GMC - 14 Volt Power Module Temperature Sensor 1 Performance - AutoCodes.com — P1A90 GMC Code - 14 Volt Power Module Temperature Sensor 1 Performance

What does this mean?

What are the Possible Causes of the DTC P1A90 GMC?

Faulty 14 Volt Power Module
14 Volt Power Module harness is open or shorted
14 Volt Power Module circuit poor electrical connection

How to Fix the DTC P1A90 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 P1A90 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 P1A90 GMC 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 P1A90 GMC Code

1. What are common symptoms of OBDII code P1A90 GMC?

Common symptoms of this code may include reduced fuel efficiency, decreased engine performance, and the illumination of the Check Engine Light on the dashboard.

2. What does the OBDII code P1A90 GMC indicate?

The code P1A90 GMC specifically refers to a performance issue with the 14 Volt Power Module Temperature Sensor 1 in the vehicle's electrical system.

3. What are some possible causes of OBDII code P1A90 GMC?

Potential causes of this code may include a faulty temperature sensor, wiring issues, a malfunctioning power module, or a problem with the electrical connections.

4. How can I diagnose OBDII code P1A90 GMC?

Diagnosing this code typically involves using a diagnostic scanner to retrieve the trouble codes, inspecting the temperature sensor and related components, and testing the electrical connections for proper voltage.

5. Can I drive my vehicle with OBDII code P1A90 GMC?

It is generally not recommended to drive your vehicle with this code present, as it can lead to further damage and potential safety hazards. It is advisable to address the issue promptly.

6. How can I repair OBDII code P1A90 GMC?

Repairing this code may involve replacing the faulty temperature sensor, repairing any damaged wiring or connections, resetting the fault codes, and conducting a thorough inspection of the power module.

7. Is it possible to reset OBDII code P1A90 GMC without repairs?

While you can clear the code using a diagnostic scanner, it is essential to address the underlying issue causing the fault code to prevent it from recurring and potentially causing more significant problems.

8. What should I do if OBDII code P1A90 GMC keeps coming back after repairs?

If the code persists after repairs, it may indicate that the root cause of the issue was not fully resolved. In such cases, a more in-depth diagnosis or consultation with a professional technician may be necessary.

9. Are there any preventive measures to avoid OBDII code P1A90 GMC?

Regular maintenance, such as checking the electrical system components, ensuring proper wiring connections, and addressing any warning signs promptly, can help prevent issues that may trigger this fault code.

10. Can a DIY enthusiast tackle the repair for OBDII code P1A90 GMC?

While some aspects of addressing this code may be within the reach of experienced DIY enthusiasts, it is recommended to seek professional assistance for a thorough diagnosis and proper repair to ensure the issue is resolved correctly.