P1A86 GMC Code - Starter/Generator Control Module Coolant Level Sensor 4 High Voltage
Quick Answer
The Starter/Generator Control Module (SGCM) electronics are immersed in an internal fluid to distribute the heat of the electronics evenly through the SGCM, this electronics internal fluid is not the coolant that is circulated through the SGCM cooling system. 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
- P1A86 GMC indicates Starter/Generator Control Module Coolant Level Sensor 4 High Voltage.
- 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 P1A86 GMC Description
What are the Possible Causes of the DTC P1A86 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 P1A86 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 P1A86 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 P1A86 GMC Code
1. What does the OBDII code P1A86 mean on a GMC vehicle?
P1A86 indicates an issue with the Starter/Generator Control Module Coolant Level Sensor 4 detecting a coolant level that is too high.
2. What are the common symptoms of the P1A86 code on a GMC?
Common symptoms include a check engine light, potential reduced performance, overheating issues, and erratic hybrid or electrical system behavior.
3. What causes the P1A86 code to trigger?
This code can be caused by a faulty coolant level sensor, wiring issues, a short or open circuit, or actual coolant overfill in the system.
4. Can I drive with the P1A86 code on my GMC?
It’s not recommended to drive until the issue is resolved, as it may lead to overheating or damage to the starter/generator control module.
5. How do I diagnose the P1A86 code on a GMC?
Diagnosis involves inspecting the coolant level sensor, checking the wiring and connectors for damage, and using a scan tool to monitor sensor data.
6. How do I fix the P1A86 code on a GMC vehicle?
Repairs may include replacing the coolant level sensor, repairing damaged wiring, clearing blockages in the coolant system, or resetting the system with a scan tool.
7. Can low coolant cause the P1A86 code?
The code specifically relates to high coolant levels, but improper coolant levels (too high or too low) can still affect the system and trigger related issues.
8. Is the P1A86 code covered under GMC’s warranty?
It depends on your vehicle’s warranty coverage and terms, but hybrid or electrical system components may be covered under certain warranties.
9. Will replacing the coolant resolve the P1A86 code?
Replacing coolant alone may not fix the issue unless the old coolant was contaminated or causing blockages. The sensor and wiring should also be inspected.
10. How much does it cost to fix the P1A86 code on a GMC?
Repair costs vary depending on the issue, but replacing the coolant level sensor typically costs between $150 and $300, including parts and labor.
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