The P0C1B: Auxiliary Transmission Fluid Pump Control Module Internal Temperature Too High fault code indicates that the internal temperature of the control module for the auxiliary transmission fluid pump is higher than expected. This can be caused by cooling system failures, faulty temperature sensors, or issues with the control module itself. Overheating can result in poor transmission fluid circulation, leading to performance problems and potential damage.
P0C1B – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0C1B: Auxiliary Transmission Fluid Pump Control Module Internal Temperature Too High |
| Is it serious? | Yes, overheating can damage the control module and affect transmission performance. |
| Possible causes | – Overheating of the control module – Cooling system failure – Faulty temperature sensors |
| How to diagnose? | – Check the internal temperature of the control module – Inspect the cooling system – Test temperature sensors |
P0C1B Meaning
The P0C1B code indicates that the internal temperature of the control module for the auxiliary transmission fluid pump has exceeded safe operating limits. This can be caused by failures in the cooling system, such as low coolant levels or blocked airflow, or by faulty temperature sensors that may be providing inaccurate readings. Overheating of the control module can affect transmission fluid flow and cause transmission issues if not addressed promptly.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for any additional related codes, especially those linked to overheating or cooling system faults. | OBD-II Scanner |
| Check Internal Temperature of the Control Module | Use a diagnostic tool to measure the internal temperature of the auxiliary transmission fluid pump control module. Compare the temperature with manufacturer specifications. | Temperature Diagnostic Tool, Multimeter |
| Inspect the Cooling System | Inspect the cooling system, including the coolant levels, fans, pumps, and heat exchangers, to ensure they are functioning correctly and cooling the control module properly. | Cooling System Tools, Flashlight |
| Test Temperature Sensors | Test the temperature sensors in the control module to ensure they are providing accurate readings. Replace faulty sensors if necessary. | Multimeter, Diagnostic Tool |
| Inspect for Blockages in Cooling Channels | Check for blockages or debris in the cooling system that may be preventing adequate cooling of the control module. | Flashlight, Cooling System Tools |
| Clear the Code and Test Drive | After repairs or adjustments, clear the fault code using an OBD-II scanner and take the vehicle for a test drive to ensure that the control module’s temperature remains within normal limits. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, re-scan the system to ensure that the P0C1B code does not return. | OBD-II Scanner |
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