[SOLVED] Fix U189A Code: Hybrid Powertrain Control Module Communication Lost

The automobile fault code U189A indicates a problem with the Hybrid Powertrain Control Module or its related components. The most common symptom is the illumination of the Engine Light or Service Engine Soon Warning Light.

The cause of this fault code could be a faulty Hybrid Powertrain Control Module, an open or shorted harness, or a poor electrical connection.

The repair importance is high as it affects the performance of the hybrid powertrain.

The repair difficulty is moderate, and the repair time is estimated at 1.0 hour.

To fix the issue, one should visually inspect the wiring harness and connectors, check for damaged components, and look for broken, bent, pushed out, or corroded connector’s pins. It is essential to check the possible causes listed above to interpret the fault code correctly.

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 due to the u189a fault code.

Here are the symptoms to look out for:

  • The automobile fault code U189A has the following symptoms: Engine Light ON, Service Engine Soon Warning Light ON.

The automobile fault code u189a can be caused by a faulty control module or poor electrical connections.

  • The automobile fault code U189A can be caused by a faulty Hybrid Powertrain Control Module.
  • It can also be caused by an open or shorted Hybrid Powertrain Control Module harness.
  • Another cause can be a poor electrical connection in the Hybrid Powertrain Control Module circuit.
  • Lastly, a faulty DC to DC Converter Control Module ‘A’ can also cause this fault code.

Below are some possible fixes for the automobile fault code u189a, including inspecting wiring harness and connectors for damage or corrosion.

  • To fix the automobile fault code u189a, you need to check the possible causes listed above.
  • 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 automobile fault code U189A has an estimated repair time of 1.0 hour.

The cost of fixing this fault code is influenced by the repair time. Most auto repair shops charge between $75 and $150 per hour for their services.

Therefore, the fixing cost of U189A will range between $75 and $150, depending on the repair time required.

The U189A fault code is related to the communication between the DC to DC Converter Control Module ‘A’ and the Hybrid Powertrain Control Module. This fault code is set when the Powertrain Control Module (PCM) does not receive a node alive message from the identified module within 5 seconds of establishing class 2 serial data communication.

The U189A code is reported on a class 2 link to the scan tool by the PCM, even if it is set by different modules.

What are the possible causes of the u189a automobile fault code?

If you’re experiencing the u189a automobile fault code, it’s likely that your engine light is on. This could be due to a faulty Hybrid Powertrain Control Module, an open or shorted Hybrid Powertrain Control Module harness, a poor electrical connection in the Hybrid Powertrain Control Module circuit, or a faulty DC To DC Converter Control Module ‘A’. To fix the issue, check the possible causes listed above, visually inspect the related wiring harness and connectors, and look for damaged components or broken, bent, pushed out, or corroded connector’s pins.

How can I visually inspect the wiring harness and connectors related to the Hybrid Powertrain Control Module?

If you’re experiencing an Engine Light ON or Service Engine Soon Warning Light, it could be due to a faulty Hybrid Powertrain Control Module or related wiring issues. To visually inspect the wiring harness and connectors, check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins. This will help identify if the Hybrid Powertrain Control Module harness is open or shorted, or if there is a poor electrical connection. Once identified, you can take the necessary steps to fix the issue.

What should I do if I find damaged components or broken, bent, pushed out, or corroded connector’s pins while checking for the u189a fault code?

If you find damaged components or broken, bent, pushed out, or corroded connector’s pins while checking for the u189a fault code, it’s important to take action. These issues can cause the engine light to turn on and may be related to a faulty Hybrid Powertrain Control Module or poor electrical connection. To fix the issue, visually inspect the related wiring harness and connectors, and check for damaged components. Be sure to address any issues you find promptly to prevent further damage.

u189a error fault code explained

If the engine light is on, it may be due to a faulty Hybrid Powertrain Control Module, an open or shorted harness, poor electrical connection, or a faulty DC to DC Converter Control Module ‘A’.

Visually inspect the wiring harness and connectors for damage or corrosion. Check for broken, bent, or pushed out connector pins.

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