P1A94 Buick 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 Buick 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 Buick 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 Buick?
- 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 Buick?
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 Buick 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 Buick Code
What does the OBDII code P1A94 mean on a Buick?
The P1A94 code indicates that the 14-volt power module in the vehicle is stuck in the "ON" position and is not functioning as expected.
What are the common symptoms of the P1A94 code?
Typical symptoms include an illuminated check engine light, decreased fuel efficiency, electrical system warnings, and potential battery charging issues.
What causes the P1A94 code to appear?
The common causes include a malfunctioning 14-volt power module, wiring or connector issues, or a fault in the powertrain control module (PCM).
Can I drive my Buick with the P1A94 code?
While the car may still be drivable, leaving this issue unaddressed can lead to further electrical or charging system problems over time.
How is the P1A94 code diagnosed?
A technician will use a scan tool to confirm the code, inspect the 14-volt power module, check electrical connections, and test the related circuits for faults.
What repairs are typically needed for the P1A94 code?
Repairs may include replacing the 14-volt power module, repairing damaged wiring, or reprogramming or replacing the PCM if necessary.
Is the P1A94 code specific to Buick vehicles?
While this issue is more common in Buick models, the P1A94 code can potentially appear in other GM vehicles with similar systems.
How much does it cost to fix the P1A94 code?
The repair cost varies depending on the specific issue but can range from $300 to $1,000, including parts and labor.
Can a dead battery trigger the P1A94 code?
A weak or dead battery can sometimes contribute to electrical faults, but the P1A94 code is typically related to the 14-volt power module itself.
Does the P1A94 code require module reprogramming?
In some cases, reprogramming the powertrain control module (PCM) may be necessary if software-related issues are contributing to the code.
Discuss the causes and fixes for P1A94 Buick OBDII Code
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