AutoCodes – Cadillac – P1A91 Cadillac

P1A91 Cadillac Code - 14 Volt Power Module Temperature Sensor 1 Circuit Low Voltage

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: P1A91 Cadillac indicates 14 Volt Power Module Temperature Sensor 1 Circuit Low Voltage.
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 776

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 P1A91 Cadillac 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 P1A91 Cadillac - 14 Volt Power Module Temperature Sensor 1 Circuit Low Voltage - AutoCodes.com — P1A91 Cadillac Code - 14 Volt Power Module Temperature Sensor 1 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1A91 Cadillac?

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 P1A91 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 P1A91 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.

Need more information about the P1A91 Cadillac code?

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Need Help with the Code?

Get the P1A91 Cadillac code diagnosed by a professional: Find a repair shop in your area

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 P1A91 Cadillac Code

1. What are the common symptoms of OBDII code P1A91 in a Cadillac related to the 14 Volt Power Module Temperature Sensor 1 Circuit Low Voltage?

- Common symptoms include poor fuel efficiency, reduced engine performance, and potential illumination of the check engine light.

2. What are the possible causes of OBDII code P1A91 in a Cadillac?

- Possible causes include a faulty 14 Volt Power Module Temperature Sensor, damaged wiring or connectors, or issues with the power module itself.

3. How can I diagnose the 14 Volt Power Module Temperature Sensor 1 Circuit Low Voltage issue in my Cadillac?

- Diagnosing the issue involves using an OBDII scanner to retrieve the specific code, checking the sensor and related wiring for damage, and testing the power module's functionality.

4. Can I drive my Cadillac with the P1A91 fault code?

- It is not recommended to drive your Cadillac with a persistent P1A91 fault code, as it can lead to engine performance issues and potential long-term damage.

5. What is the typical repair process for fixing the 14 Volt Power Module Temperature Sensor 1 Circuit Low Voltage issue in a Cadillac?

- The repair process involves identifying and replacing the faulty sensor, repairing any damaged wiring or connectors, and clearing the fault code using an OBDII scanner.

6. Are there any DIY tips for addressing the P1A91 fault code in a Cadillac?

- While some basic diagnostic steps can be performed by DIY enthusiasts, it is recommended to seek professional help for accurate diagnosis and repair of the issue.

7. How much does it cost to repair the 14 Volt Power Module Temperature Sensor 1 Circuit Low Voltage problem in a Cadillac?

- Repair costs can vary depending on the extent of the issue, but typically involve parts and labor expenses ranging from $200 to $500.

8. Can a faulty 14 Volt Power Module Temperature Sensor affect other systems in the Cadillac?

- Yes, a faulty sensor can affect the overall performance of the vehicle, including fuel efficiency, engine power, and emissions control systems.

9. Is it possible to prevent the recurrence of the P1A91 fault code in a Cadillac?

- Regular maintenance checks, addressing any electrical issues promptly, and using quality parts can help prevent the recurrence of the fault code in the future.

10. How long does it take to repair the 14 Volt Power Module Temperature Sensor 1 Circuit Low Voltage issue in a Cadillac?

- The repair time can vary depending on the complexity of the issue and availability of parts, but typically takes around 1 to 2 hours for a professional technician to complete.