AutoCodes – Generic – P1A90

P1A90 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 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 1,912

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

What does this mean?

What are the Possible Causes of the DTC P1A90?

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?

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 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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Information for Specific Makes

P1A90 Buick — 14 Volt Power Module Temperature Sensor 1 Performance
P1A90 Cadillac — 14 Volt Power Module Temperature Sensor 1 Performance
P1A90 Chevrolet — 14 Volt Power Module Temperature Sensor 1 Performance
P1A90 GMC — 14 Volt Power Module Temperature Sensor 1 Performance
P1A90 Saturn — 14 Volt Power Module Temperature Sensor 1 Performance

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 Code

1. What are common symptoms of OBDII code P1A90 (14 Volt Power Module Temperature Sensor 1 Performance)?

- Common symptoms include poor fuel efficiency, rough idling, and the illumination of the check engine light.

2. What can cause OBDII code P1A90 to trigger?

- This code may be triggered by a faulty 14 volt power module temperature sensor, wiring issues, or a problem with the power module itself.

3. How serious is OBDII code P1A90?

- While the vehicle may still be drivable with this code, it is important to address it promptly to prevent potential damage to the power module or other components.

4. How do I diagnose the underlying issue causing OBDII code P1A90?

- Diagnosis typically involves using a scan tool to read the code, checking the sensor and wiring for faults, and testing the power module's performance.

5. Can I continue driving my vehicle with OBDII code P1A90?

- It is generally not recommended to continue driving with this code present, as it can lead to decreased performance and potential long-term damage.

6. What are some DIY repair tips for resolving OBDII code P1A90?

- DIY repair tips may include checking and cleaning the sensor connections, inspecting the wiring for damage, and ensuring proper voltage levels.

7. How much does it typically cost to fix OBDII code P1A90?

- The cost of repair can vary depending on the underlying issue, but it may range from around $100 for a sensor replacement to several hundred dollars for more extensive repairs.

8. Can I reset the check engine light after fixing OBDII code P1A90?

- Yes, the check engine light can be reset using a scan tool after the underlying issue causing OBDII code P1A90 has been successfully addressed.

9. Are there any recalls or technical service bulletins related to OBDII code P1A90?

- It is recommended to check with your vehicle manufacturer or authorized service center for any recalls or technical service bulletins related to this code.

10. How can I prevent OBDII code P1A90 from recurring in the future?

- Regular maintenance, such as checking and replacing sensors as needed, keeping up with vehicle inspections, and addressing any performance issues promptly, can help prevent this code from recurring.