The P1A78 automobile fault code indicates a problem with the StarterGenerator Control Module (SGCM), which can trigger the Engine Light ON or Service Engine Soon Warning Light. The cause of this issue could be a faulty SGCM, an open or shorted SGCM harness, or a poor electrical connection in the SGCM circuit. It is important to address this issue promptly as it can lead to further damage to the vehicle.

The repair time for this issue is estimated to be around 1.0. To fix this problem, one should visually inspect the related wiring harness and connectors, check for damaged components, and look for broken, bent, pushed out, or corroded connector’s pins.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level10.0 (Out of 10)

If you notice the Engine Light ON or Service Engine Soon Warning Light, it could be a sign of p1a78 fault code.

Here are the symptoms to look out for:

  • The P1A78 fault code in automobiles can cause several symptoms, including the engine light turning on or the service engine soon warning light appearing.
  • Other symptoms may include reduced engine power, decreased fuel efficiency, and difficulty starting the engine.
  • Additionally, the vehicle may experience rough idling or stalling, and there may be a noticeable decrease in acceleration.
  • It is important to address these symptoms promptly to prevent further damage to the vehicle and ensure safe driving conditions.

The P1A78 fault code in automobiles can be caused by various factors, including a faulty SGCM, open or shorted SGCM harness, and poor electrical connection in the SGCM circuit.

  • The automobile fault code P1A78 can be caused by a faulty Starter/Generator Control Module (SGCM).
  • It can also be caused by an open or shorted SGCM harness.
  • Additionally, a poor electrical connection in the SGCM circuit can also trigger this fault code.

Below are the possible fixes for the automobile fault code p1a78, including inspecting wiring harness and connectors for damage or corrosion.

  • To fix the automobile fault code P1A78, first, check the possible causes listed above.
  • Then, visually inspect the related wiring harness and connectors.
  • Look for damaged components and check for broken, bent, pushed out, or corroded connector’s pins.
  • This fix will take an estimated repair time of 1.0 hour.

The fault code P1A78 indicates a problem with the hybrid battery pack cooling system. The estimated repair time for this issue is 1.0 hour. The cost of fixing this issue can vary depending on the auto repair shop, but it is common for most shops to charge between $75 and $150 per hour.

Other factors that may influence the cost include the severity of the issue, the type of vehicle, and the location of the repair shop. It is important to address this issue promptly to avoid further damage to the hybrid battery pack.

The P1A78 code is related to the StarterGenerator Control Module (SGCM) in automobiles. The SGCM monitors its internal fluid temperature sensors to control the SGCM coolant pump and SGCM cooling fan.

The code indicates that there is a problem with the coolant temperature sensor 3 performance.

The internal fluid temperature sensors of the SGCM are thermistors and are not serviceable. The input parameters are not displayed on the scan tool, making it difficult to diagnose the issue.

The resistances of the sensors are high when the internal fluid temperatures are cold and low when they are hot, affecting the voltage signals.

What are the possible causes of the P1A78 automobile fault code?

If you see the engine light on or the service engine soon warning light, it could be due to the P1A78 fault code. This code is usually caused by a faulty Starter/Generator Control Module (SGCM), an open or shorted SGCM harness, or a poor electrical connection in the SGCM circuit. To fix this issue, you should visually inspect the related wiring harness and connectors, check for damaged components, and look for broken, bent, pushed out, or corroded connector’s pins.

How can I visually inspect the wiring harness and connectors related to the Starter/Generator Control Module (SGCM)?

If you’re experiencing an Engine Light ON or Service Engine Soon Warning Light, it could be due to a faulty Starter/Generator Control Module (SGCM), an open or shorted SGCM harness, or a poor electrical connection in the SGCM circuit. To fix this issue, visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.

What are the consequences of ignoring the P1A78 automobile fault code?

Ignoring the P1A78 fault code in your automobile, which indicates a faulty Starter/Generator Control Module (SGCM), can lead to serious consequences. The engine light will remain on, and the SGCM may fail to start or generate power, leading to a breakdown. It is crucial to visually inspect the wiring harness and connectors, check for damaged components, and look for broken, bent, pushed out, or corroded connector’s pins to fix the issue.

p1a78 error fault code explained

If you see the Engine Light ON or Service Engine Soon Warning Light, it could be due to a faulty StarterGenerator Control Module (SGCM), an open or shorted SGCM harness, or poor electrical connection in the SGCM circuit. To fix it, visually inspect the wiring harness and connectors, check for damaged components, and look for broken, bent, pushed out, or corroded connector’s pins.

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