P1A94 GMC Code - 14-Volt Power Module Stuck ON
Quick Answer
The purpose of the Accessory Power Module (APM), integral to the Starter/Generator Control Module (SGCM), is to control the amount and direction of energy flowing between the 42 V DC and 14 V DC buses via the APM, bi-directional 42 V DC to 14 V DC converter. Common causes include Faulty Starter/Generator Control Module (SGCM), Starter/Generator Control Module (SGCM) harness is open or shorted, Starter/Generator Control Module (SGCM) 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
- P1A94 GMC indicates 14-Volt Power Module Stuck ON.
- Common causes
- Common causes include Faulty Starter/Generator Control Module (SGCM), Starter/Generator Control Module (SGCM) harness is open or shorted, Starter/Generator Control Module (SGCM) 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.
Code P1A94 GMC Description
When the APM Power Conversion direction is set to a value of 42 V to 14 V, the energy will flow from the 42 V DC Bus to the 14 V DC Bus via the APM. When the Service Charge or jump start is requested, the energy will flow from the 14 V DC Bus to the 42 V DC Bus via the APM. When the APM Power Conversion direction is set to a value of Off, the APM will be turned OFF and not consume or transfer any power. When the APM Power Conversion direction is set to a value of Invalid, the energy will flow from the 42 V DC Bus to the 14 V DC Bus via the APM.
What are the Possible Causes of the DTC P1A94 GMC?
- Faulty Starter/Generator Control Module (SGCM)
- Starter/Generator Control Module (SGCM) harness is open or shorted
- Starter/Generator Control Module (SGCM) circuit poor electrical connection
How to Fix the DTC P1A94 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 P1A94 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.
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Frequently Asked Questions about P1A94 GMC Code
1. What are the common symptoms of OBDII code P1A94 in a GMC vehicle?
- Common symptoms include the battery not charging properly, the vehicle not starting, and dashboard warning lights related to the charging system.
2. What does the OBDII code P1A94 GMC indicate about the 14-Volt Power Module?
- The code indicates that the 14-Volt Power Module is stuck in the ON position, causing issues with the vehicle's charging system.
3. What are the possible causes of the 14-Volt Power Module being stuck ON?
- Possible causes include a faulty power module, wiring issues, a failed voltage regulator, or problems with the vehicle's control module.
4. How can I diagnose the issue causing OBDII code P1A94 in my GMC vehicle?
- Diagnosing the issue may involve checking the wiring connections, testing the power module, inspecting the voltage regulator, and scanning for other related trouble codes.
5. Is it safe to continue driving my GMC vehicle with OBDII code P1A94 present?
- It is not recommended to drive the vehicle with this code present, as it can lead to battery drainage, potential stalling, and other electrical system issues.
6. Can I reset the OBDII code P1A94 in my GMC to see if it comes back?
- While you can reset the code, it is important to diagnose and repair the underlying issue causing the code before clearing it to prevent further damage to the vehicle.
7. How can I repair the 14-Volt Power Module Stuck ON issue in my GMC?
- Repair options may include replacing the power module, fixing wiring connections, replacing the voltage regulator, or addressing any control module issues identified during diagnosis.
8. Will replacing the battery fix the OBDII code P1A94 in my GMC vehicle?
- While a weak or failing battery can contribute to electrical system issues, simply replacing the battery may not resolve the specific issue related to the 14-Volt Power Module being stuck ON.
9. Are there any DIY tips for troubleshooting OBDII code P1A94 in a GMC?
- DIY tips include checking battery connections, inspecting fuses, visually inspecting wiring for damage, and conducting a basic voltage test on the battery and power module.
10. How much can I expect to pay for professional repairs related to OBDII code P1A94 in my GMC?
- Repair costs can vary depending on the exact cause of the issue, but expect to pay anywhere from $200 to $800 for parts and labor, with prices potentially higher if extensive repairs are needed.
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