AutoCodes – GMC – P1A91 GMC

P1A91 GMC 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 GMC 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 883

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC P1A91 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 P1A91 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 P1A91 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 P1A91 GMC code?

Need more information on how to fix the P1A91 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1A91 GMC 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 GMC Code

1. What are the common symptoms of OBDII code P1A91 GMC?

The common symptoms of OBDII code P1A91 GMC include poor fuel efficiency, reduced engine performance, and the illumination of the check engine light.

2. What could cause the OBDII code P1A91 GMC to trigger?

The OBDII code P1A91 GMC, related to the 14 Volt Power Module Temperature Sensor 1 Circuit Low Voltage, can be triggered by a faulty temperature sensor, wiring issues, or a problem with the power module.

3. How serious is the OBDII code P1A91 GMC?

While the severity of the OBDII code P1A91 GMC can vary, it is important to address the underlying issue promptly to prevent further damage to the vehicle's electrical system.

4. How can I diagnose the OBDII code P1A91 GMC?

Diagnosing the OBDII code P1A91 GMC typically involves using an OBDII scanner to retrieve the trouble codes and then testing the temperature sensor, wiring, and power module for any faults.

5. What are some repair tips for fixing the OBDII code P1A91 GMC?

Repair tips for fixing the OBDII code P1A91 GMC may include checking and replacing the temperature sensor, inspecting and repairing any damaged wiring, and ensuring proper connection to the power module.

6. Can I drive my vehicle with the OBDII code P1A91 GMC active?

It is generally not recommended to drive your vehicle with the OBDII code P1A91 GMC active, as it may lead to decreased performance and potential issues with the electrical system.

7. How much does it cost to repair the OBDII code P1A91 GMC?

The cost to repair the OBDII code P1A91 GMC can vary depending on the extent of the issue, the parts needed for replacement, and whether you choose to do the repairs yourself or take it to a mechanic.

8. Can I reset the OBDII code P1A91 GMC with a simple reset tool?

Resetting the OBDII code P1A91 GMC with a simple reset tool may temporarily clear the code, but it will likely reappear if the underlying issue is not addressed and fixed.

9. Are there any recalls or technical service bulletins related to the OBDII code P1A91 GMC?

It is recommended to check with the manufacturer or a trusted automotive source for any recalls or technical service bulletins related to the OBDII code P1A91 GMC for your specific vehicle make and model.

10. Is it possible to prevent the OBDII code P1A91 GMC from occurring in the future?

Regular maintenance, such as checking the temperature sensor and wiring connections, can help prevent the OBDII code P1A91 GMC from occurring in the future.