The P0C23: Auxiliary Transmission Fluid Pump Control Module Circuit/Open fault code indicates that there is an open circuit within the control module of the auxiliary transmission fluid pump. This can be caused by faulty wiring, damaged connections, or internal control module issues. An open circuit in the control module can prevent the transmission fluid pump from functioning properly, which could lead to transmission cooling problems and performance issues.
P0C23 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0C23: Auxiliary Transmission Fluid Pump Control Module Circuit/Open |
| Is it serious? | Yes, an open circuit can prevent the pump from operating, leading to transmission cooling issues. |
| Possible causes | – Open circuit in the control module – Faulty wiring or connections – Control module issues |
| How to diagnose? | – Inspect the control module circuit for open connections – Test the control module – Check wiring and connections |
P0C23 Meaning
The P0C23 code indicates that the control module for the auxiliary transmission fluid pump is experiencing an open circuit. This can occur due to damaged wiring, poor connections, or internal issues within the control module itself. The auxiliary transmission fluid pump is essential for cooling the transmission fluid, and an open circuit can prevent the pump from operating correctly, leading to potential transmission overheating.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional related codes, especially those associated with electrical system or control module issues. | OBD-II Scanner |
| Inspect the Control Module Circuit for Open Connections | Visually inspect the wiring and connectors in the control module circuit for signs of damage, loose connections, or corrosion. Check for any open circuits that could be causing the issue. | Multimeter, Flashlight, Wiring Diagram |
| Test the Control Module | Use a diagnostic tool to test the functionality of the auxiliary transmission fluid pump control module. Verify that the module is functioning within manufacturer specifications. | Multimeter, Diagnostic Tool |
| Inspect Wiring and Connections | Inspect all wiring and connectors leading to and from the control module to ensure there are no faults, damage, or loose connections causing the open circuit. Repair or replace any faulty components. | Flashlight, Multimeter, Wiring Diagram |
| Test Related Components | If the control module and wiring appear to be functional, test other related components to ensure they are not contributing to the open circuit issue. | Diagnostic Tool, Vehicle Manual |
| Clear the Code and Test Drive | After completing repairs, clear the code using an OBD-II scanner and perform a test drive to ensure the pump is operating correctly and the issue has been resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, re-scan the system to ensure that the P0C23 code does not return. | OBD-II Scanner |
OBD-II scanner Buyer’s Guide
- Scanner features explained
- Different types of scanners
- Scanners for coding/odometer/ECU/checks
- Best picks + discount codes
Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)