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P128D Dodge Code - Transmission Control Module Power Control Circuit Open

Quick Answer

The P128D code for Dodge vehicles indicates a fault in the Transmission Control Module (TCM) Power Control Circuit, specifically an open circuit. Common causes include Damaged wiring or connectors in the power control circuit, Faulty TCM, Blown fuse. 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
P128D Dodge indicates Transmission Control Module Power Control Circuit Open.
Common causes
Common causes include Damaged wiring or connectors in the power control circuit, Faulty TCM, Blown fuse.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P128D Dodge Description

The P128D code for Dodge vehicles indicates a fault in the Transmission Control Module (TCM) Power Control Circuit, specifically an open circuit. The TCM is responsible for controlling the transmission functions in the vehicle, such as shifting gears and managing the overall performance of the transmission system. When the power control circuit is open, it means that there is a break in the electrical connection that supplies power to the TCM. This can lead to a range of issues that impact the vehicle's performance and drivability.

OBDII Code P128D Dodge - Transmission Control Module Power Control Circuit Open
P128D Dodge Code - Transmission Control Module Power Control Circuit Open

Common Causes of P128D Dodge

  1. Damaged wiring or connectors in the power control circuit
  2. Faulty TCM
  3. Blown fuse
  4. Malfunctioning power supply
  5. Corrosion or water damage in the electrical system

Symptoms of P128D Dodge

  1. Erratic shifting patterns
  2. Transmission slippage
  3. Reduced fuel efficiency
  4. Inability to shift gears
  5. Illuminated check engine light

How to Fix P128D Dodge

  1. First, perform a thorough inspection of the power control circuit, including checking for damaged wiring, connectors, and blown fuses.
  2. Test the TCM to determine if it is functioning correctly or needs to be replaced.
  3. Check the power supply to ensure it is providing the necessary voltage to the TCM.
  4. Repair or replace any damaged components in the power control circuit, such as wiring, connectors, or fuses.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P128D Dodge

The typical repair costs for addressing a P128D code in a Dodge vehicle can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts and labor for this type of repair could range from $200 to $600. However, as mentioned earlier, the actual costs may differ based on factors like location, vehicle make and model, and labor rates at auto repair shops. It is recommended to obtain quotes from local shops to get a more accurate estimate for the repair.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P128D Dodge Code

1. What are common symptoms of OBDII code P128D in a Dodge related to the Transmission Control Module Power Control Circuit Open?

- Common symptoms include issues with shifting gears, poor acceleration, and the transmission going into limp mode.

2. What are possible causes of OBDII code P128D in a Dodge indicating a Transmission Control Module Power Control Circuit Open?

- Possible causes include a faulty transmission control module (TCM), a damaged wiring harness, or a blown fuse related to the TCM power circuit.

3. How can I diagnose the OBDII code P128D in my Dodge for a Transmission Control Module Power Control Circuit Open?

- Diagnosis typically involves using a scan tool to read the code, checking the TCM power supply circuit for continuity, and inspecting the wiring and connectors for any damage.

4. Can I still drive my Dodge with OBDII code P128D indicating a Transmission Control Module Power Control Circuit Open?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the transmission system.

5. How can I repair OBDII code P128D in my Dodge for a Transmission Control Module Power Control Circuit Open?

- Repair may involve replacing the faulty TCM, repairing or replacing damaged wiring, or addressing any blown fuses in the TCM power circuit.

6. Is it safe to clear the OBDII code P128D related to the Transmission Control Module Power Control Circuit Open in my Dodge without fixing the issue?

- Clearing the code without addressing the underlying problem is not recommended, as it may lead to ongoing transmission issues and potential safety hazards.

7. What are some preventive maintenance tips to avoid OBDII code P128D in a Dodge indicating a Transmission Control Module Power Control Circuit Open?

- Regularly inspecting the transmission system, ensuring proper electrical connections, and addressing any warning signs promptly can help prevent this code from occurring.

8. Can a DIY enthusiast fix OBDII code P128D in a Dodge related to a Transmission Control Module Power Control Circuit Open?

- Depending on the skill level and experience of the individual, some DIY enthusiasts may be able to diagnose and repair this issue, but it is recommended to seek professional help for complex transmission problems.

9. Are there any recalls or service bulletins related to OBDII code P128D in Dodge vehicles for a Transmission Control Module Power Control Circuit Open?

- It is advisable to check with the manufacturer or a certified Dodge dealership for any relevant recalls or service bulletins related to this specific OBDII code.

10. How much does it typically cost to repair OBDII code P128D in a Dodge indicating a Transmission Control Module Power Control Circuit Open?

- Repair costs can vary depending on the exact cause of the issue, but they may range from a few hundred to over a thousand dollars, including parts and labor.

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