P1A94 Cadillac 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 Cadillac 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 Cadillac 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 Cadillac?
- 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 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 P1A94 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.
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Frequently Asked Questions about P1A94 Cadillac Code
1. What does the OBDII code P1A94 mean on a Cadillac?
P1A94 indicates a fault in the 14-volt power module, specifically that it is stuck in the ON position and not functioning as intended.
2. What are the common symptoms of the P1A94 code?
Symptoms may include the check engine light turning on, battery charging issues, reduced fuel efficiency, or electrical system malfunctions.
3. What causes the P1A94 code to appear?
The code is typically caused by a malfunctioning 14-volt power module, wiring issues, faulty connectors, or software-related problems in the power management system.
4. Can the P1A94 code drain the battery?
Yes, if the 14-volt power module is stuck ON, it can cause excessive battery drain and potentially lead to a discharged or damaged battery.
5. How is the P1A94 code diagnosed?
A mechanic will use a scan tool to confirm the code, inspect the 14-volt power module, check for damaged wiring or connectors, and test the vehicle’s battery and alternator system.
6. Can driving with the P1A94 code damage my Cadillac?
Continuing to drive with this code may lead to electrical system issues, possible battery failure, or reduced vehicle performance. It’s best to address it promptly.
7. How do you fix the P1A94 code?
Repairs may involve replacing the 14-volt power module, repairing or replacing damaged wiring, updating software, or resetting the vehicle’s electrical system.
8. Is the P1A94 code covered under warranty?
This depends on the age and mileage of your vehicle and the specific warranty terms. Check with your Cadillac dealership for details.
9. Can a weak battery cause the P1A94 code?
A weak or failing battery can contribute to electrical issues, but the code specifically points to a problem with the 14-volt power module rather than the battery itself.
10. Is P1A94 a common issue in Cadillac vehicles?
This code is not extremely common but can occur, particularly in models with advanced electrical systems that rely on the 14-volt power module.
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