P1A78 Chevrolet Code - Starter/Generator Control Module Coolant Temperature Sensor 3 Performance
Quick Answer
The Starter/Generator Control Module (SGCM) monitors its internal fluid temperature sensors to control the SGCM coolant pump and SGCM cooling fan. 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
- P1A78 Chevrolet indicates Starter/Generator Control Module Coolant Temperature Sensor 3 Performance.
- 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 P1A78 Chevrolet Description
What are the Possible Causes of the DTC P1A78 Chevrolet?
- 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 P1A78 Chevrolet?
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 P1A78 Chevrolet 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 P1A78 Chevrolet Code
What does the OBDII code P1A78 mean for a Chevrolet vehicle?
Code P1A78 indicates an issue with the Starter/Generator Control Module Coolant Temperature Sensor 3, specifically related to its performance or accuracy.
What are the common symptoms of the P1A78 code?
Symptoms may include an illuminated check engine light, reduced hybrid or electric vehicle performance, overheating warnings, or erratic temperature readings.
What causes the P1A78 code to appear?
Common causes include a faulty coolant temperature sensor, damaged wiring or connectors, issues with the Starter/Generator Control Module, or low coolant levels.
How can I diagnose the P1A78 code?
Start by using a scan tool to confirm the code, then visually inspect the sensor, wiring, and connectors. Check coolant levels and test the sensor’s resistance against manufacturer specifications.
Can I continue driving with the P1A78 code?
It’s not recommended to drive for extended periods, as the issue could lead to improper cooling of the starter/generator system, which may cause further damage.
How do I fix the P1A78 code?
Repairs may include replacing the faulty coolant temperature sensor, repairing damaged wiring, cleaning corroded connectors, or topping off coolant levels.
How much does it cost to fix the P1A78 code?
The repair cost depends on the issue, but replacing the sensor typically ranges from $100 to $300, including parts and labor.
Can low coolant trigger the P1A78 code?
Yes, low coolant can affect the sensor's ability to measure temperature accurately, potentially triggering this code.
Is the P1A78 code specific to hybrid or electric Chevrolet vehicles?
Yes, this code is more commonly associated with hybrid or electric Chevrolet models that use a Starter/Generator Control Module.
Do I need to reprogram the control module after fixing the P1A78 code?
In most cases, reprogramming is not required, but clearing the code with a scan tool and verifying the repair is necessary.
Discuss the causes and fixes for P1A78 Chevrolet OBDII Code
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