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P0C23 OBD2: AUXILIARY Transmission Fluid Pump Control Module Circuit/Open

P0C23 OBD2: AUXILIARY Transmission Fluid Pump Control Module Circuit/Open

What Does the P0C23 Code Mean?

The OBD-II code P0C23 indicates a malfunction within the Auxiliary Transmission Fluid Pump Control Module circuit. This code is triggered when the control module detects an open circuit or a failure to deliver the required voltage to the auxiliary transmission fluid pump.

What Causes the P0C23 Code?

Several factors can lead to the P0C23 code being stored in your vehicle’s computer system:

  • Failure of the Auxiliary Transmission Fluid Pump Control Module
  • Wiring issues, such as damaged or corroded wires

What Are the Symptoms of the P0C23 Code?

When the P0C23 code is present, you may notice the following symptoms:

  • The vehicle may become immovable, leading to potential breakdowns

How Serious Is the P0C23 Code?

The P0C23 code is classified as urgent, indicating that immediate action is necessary. Ignoring this code can lead to severe damage to the vehicle’s transmission system and pose safety risks to the driver and passengers.

How to Diagnose the P0C23 Code

Diagnosis of the P0C23 code typically includes the following steps:

  • Using an OBD-II scanner to confirm the presence of the P0C23 code
  • Inspecting the wiring and connections associated with the Auxiliary Transmission Fluid Pump Control Module
  • Testing the voltage output to the control module

Common Repairs for the P0C23 Code

Repairs for the P0C23 code may involve:

  • Replacing the Auxiliary Transmission Fluid Pump Control Module if found defective
  • Repairing or replacing damaged wiring and connectors

How Much Does It Cost to Fix the P0C23 Code?

The cost to repair the P0C23 code can vary widely depending on the specific issue. Expect to pay anywhere from $150 to $600, depending on whether you need to replace the control module or repair wiring.

Can I Fix the P0C23 Code Myself?

While some vehicle owners may have the skills to diagnose and repair wiring issues, working with electronic control modules can be complex. If you’re not experienced with automotive repairs, it’s advisable to consult a professional mechanic to ensure the problem is accurately diagnosed and resolved.

About JC Landry

JC spent 15+ years as a certified Master Mechanic before trading the shop for the keyboard. He's worked across dealerships, owned and operated his own independent garage, and consulted on automotive trade school curricula, reviewing technical textbooks used in vocational programs. He now serves as Editor-in-Chief at eManualOnline.com, where he oversees the platform's technical content. He's one of the few voices in automotive publishing who has actually turned wrenches professionally on the vehicles he covers. He didn't learn automotive repair to write about it. He learned to write after spending over a decade doing it.

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