P1A99 Saturn Code - Starter/Generator Control Module Hybrid Battery Current Sensor Circuit Low Current
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 volts DC and 14 volts DC buses via the APM, bi-directional 42 volts DC to 14 volts 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
- P1A99 Saturn indicates Starter/Generator Control Module Hybrid Battery Current Sensor Circuit Low Current.
- 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 P1A99 Saturn Description
The Starter/Generator Control Module (SGCM) controls 2 functions in these DTCs. DC voltage is transformed into three phase AC power to the electric machine interface. In this case, energy flows from 36 volt to phase1, phase2 and phase3. The second case shall be generating, where the three phase AC power is used to charge the 36 volt battery pack. In this case, energy flows from phase1, phase2 and phase3 to 36 volts.
What are the Possible Causes of the DTC P1A99 Saturn?
- 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 P1A99 Saturn?
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 P1A99 Saturn 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 P1A99 Saturn Code
1. What does the OBDII code P1A99 mean on a Saturn?
P1A99 indicates an issue with the Hybrid Battery Current Sensor Circuit, specifically detecting a low current problem in the Starter/Generator Control Module.
2. What are the common symptoms of the P1A99 code?
Symptoms may include a check engine light, reduced hybrid system performance, poor fuel economy, or the hybrid system failing to engage properly.
3. What causes the P1A99 code to appear?
Common causes include a faulty hybrid battery current sensor, damaged wiring or connectors, a malfunctioning Starter/Generator Control Module, or calibration issues.
4. How do you troubleshoot the P1A99 code?
Start by inspecting the wiring and connectors for damage or corrosion, checking the current sensor for proper operation, and using a scan tool to monitor the hybrid battery system’s data.
5. Can you drive with the P1A99 code active?
Driving may still be possible, but the hybrid system may not function optimally, potentially leading to poor performance or further damage if left unaddressed.
6. How is the P1A99 code repaired?
Repairs might involve replacing the hybrid battery current sensor, repairing damaged wiring, clearing corrosion from connectors, or recalibrating the control module.
7. How much does it cost to fix the P1A99 code?
Repair costs can vary but typically range from $100 to $500, depending on whether the current sensor, wiring, or control module requires replacement or repair.
8. Can a dead battery cause the P1A99 code?
A dead or weak hybrid battery may indirectly contribute to the P1A99 code but is not its primary cause. The issue is typically related to the current sensor or its circuit.
9. Is the P1A99 code specific to Saturn hybrid vehicles?
Yes, the P1A99 code is specific to Saturn hybrid models, as it relates to the hybrid battery current sensor and control module in their hybrid systems.
10. Do you need special tools to diagnose the P1A99 code?
Yes, a professional-grade OBDII scan tool or a hybrid-specific diagnostic tool is often required to accurately diagnose and monitor the hybrid battery system for this code.
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