P1A94 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 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 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?
- 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?
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 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
- P1A94 Buick — 14-Volt Power Module Stuck ON
- P1A94 Cadillac — 14-Volt Power Module Stuck ON
- P1A94 Chevrolet — 14-Volt Power Module Stuck ON
- P1A94 GMC — 14-Volt Power Module Stuck ON
- P1A94 Saturn — 14-Volt Power Module Stuck ON
Frequently Asked Questions about P1A94 Code
1. What does OBDII code P1A94 indicate?
Code P1A94 indicates that the 14-volt power module is stuck ON in the vehicle's electrical system.
2. What are the common symptoms of OBDII code P1A94?
Common symptoms of code P1A94 include illuminated warning lights on the dashboard, poor fuel economy, and issues with starting the vehicle.
3. What are the possible causes of OBDII code P1A94?
Possible causes of code P1A94 include a malfunctioning 14-volt power module, wiring issues, or a faulty control module related to the power system.
4. How can I diagnose the OBDII code P1A94?
Diagnosing code P1A94 typically involves using a diagnostic scanner to retrieve the trouble code, inspecting the 14-volt power module and related components, and performing electrical tests as needed.
5. Can I still drive my vehicle with OBDII code P1A94?
It is not recommended to drive the vehicle with code P1A94 present, as it can lead to further electrical issues and potential damage to other components.
6. How serious is OBDII code P1A94?
Code P1A94 should be addressed promptly to prevent potential electrical system failure and ensure the vehicle operates safely and efficiently.
7. How can I repair OBDII code P1A94?
Repairing code P1A94 may involve replacing the faulty 14-volt power module, repairing any damaged wiring, or reprogramming the control module related to the power system.
8. Can I reset OBDII code P1A94 without fixing the underlying issue?
Resetting the code without fixing the underlying issue will only temporarily clear the warning light, and the problem is likely to reoccur if not properly addressed.
9. Is OBDII code P1A94 a common issue in certain vehicle makes or models?
Code P1A94 may be more common in specific vehicle makes or models known for electrical system issues, but it can potentially occur in any vehicle with a malfunctioning 14-volt power module.
10. How much does it cost to repair OBDII code P1A94?
The cost of repairing code P1A94 can vary depending on the extent of the issue, the parts needed for replacement, and whether professional labor is required. It is advisable to consult with a mechanic for a more accurate estimate.
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