OBD code P0864 indicates a problem with the Transmission Control Module (TCM) communication circuit.
Symptoms include the Engine Light being ON.
This issue can be caused by a faulty TCM, open/shorted TCM harness, poor electrical connection, or a faulty Engine Control Module (ECM).
It is a moderate concern.
To fix it, inspect and repair any damaged wiring or connectors related to the TCM circuit.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
Symptoms of the p0864 OBD Code
The vehicle may experience shifting issues or lack of response to gear changes with fault code P0864.
- Symptoms: Engine Light ON.
- Possible harsh shifting from the transmission.
- Difficulty shifting gears.
- Transmission slipping.
Causes of the p0864 OBD Code
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Possible reasons for fault code P0864 include issues with the transmission fluid pressure sensor circuit.
- P0864 can be caused by a faulty Transmission Control Module (TCM).
- A Transmission Control Module harness that is open or shorted.
- A Transmission Control Module circuit with poor electrical connection.
- A faulty Engine Control Module (ECM).
Fixing Error Code p0864 Step By Step
Inspect the transmission fluid pressure sensor circuit for potential issues and address as needed.
- To fix OBDII code P0864, first, review the possible causes related to the transmission fluid pressure sensor circuit.
- Visually inspect the wiring harness and connectors for any damage.
- Check the connector pins for signs of being broken, bent, pushed out, or corroded.
- Test the transmission fluid pressure sensor for proper operation.
- Replace the transmission fluid pressure sensor if it is faulty.
- Clear the fault codes and perform a road test to ensure the issue is resolved.
Cost Of Fixing p0864 Fault Code
Diagnosing and repairing fault code P0864 typically involves inspecting and servicing the transmission fluid pressure.
The cost to diagnose and fix OBD code P0864 typically ranges from $75 to $150, with an estimated repair time of 1. 0 hour.
Costs depend on labor rates, shop location, and the complexity of the repair needed.
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Details of the p0864 OBD Code
Code P0864 relates to a transmission fluid pressure sensor circuit issue.
OBD code P0864 means that a fault has been detected in the Transmission Fluid Pressure (TFP) Sensor Circuit.
This code is triggered by the Engine Control Module (ECM) when it detects an electrical fault in the circuit related to the transmission fluid pressure sensor.
The TFP sensor is responsible for monitoring the hydraulic pressure in the transmission.
It provides crucial data to the ECM for proper transmission operation, including shift timing and quality.
When the sensor or its circuit malfunctions, it can lead to drivability issues and potential transmission damage if not addressed promptly.
Mechanic’s Tech Notes
Code P0864 relates to a transmission fluid pressure sensor circuit issue in the vehicle.
To diagnose and fix OBDII code P0864, start by checking the transmission control module (TCM) power and ground using a multimeter.
Verify TCM communication over the Controller Area Network (CAN) using a scan tool.
If the TCM does not respond, reprogramming or reflashing may be necessary.
Visually inspect the wiring harness and connectors for any damage, and ensure connector pins are not broken, bent, pushed out, or corroded.
This thorough inspection will help identify and address any issues causing the P0864 code.
FAQ
OBD code P0864 indicates a problem with the Transmission Control Module (TCM). Check TCM, wiring harness, and connectors for faults to resolve the issue.
Common symptoms of OBD code P0864 include Engine Light ON, caused by issues like faulty TCM, open/shorted harness, poor connections. Fix involves inspecting wiring and connectors for damage.
Diagnose and repair OBD code P0864 by checking for a faulty TCM, open/shorted TCM harness, poor connections, or faulty ECM. Inspect wiring and connectors for damage.
Wrap Up
If your transmission is slipping or shifting erratically and you see OBDII code P0864, it may be caused by a faulty gear shift module communication circuit, a malfunctioning transmission fluid pressure sensor, or issues with the transmission control module.
To address OBDII code P0864, check the wiring and connectors related to the gear shift module and transmission fluid pressure sensor.
Test the sensor for proper operation and replace if necessary.
Ensure all connections are secure and free of corrosion or damage.
