Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer has detected a problem with the sensor that checks the pressure of the transmission fluid. It's like when you have a balloon and the sensor is supposed to tell if it's too full, but it's saying it's too full even if it's not.
The P0873 code is triggered when the Transmission Control Module (TCM) detects a high voltage signal from the transmission fluid pressure sensor/switch C circuit.
The Transmission Fluid Pressure Sensor/Switch C is responsible for monitoring the hydraulic pressure within the transmission. If the sensor or switch sends a voltage signal that is higher than the expected range, the TCM will set the P0873 code. This could be due to electrical issues, a faulty sensor, or a problem within the transmission itself.
• Check Engine Light is on
• Transmission may not shift properly
• Poor fuel economy
• Faulty transmission fluid pressure sensor/switch
• Wiring issues such as short to voltage
• Faulty Transmission Control Module (TCM)
Transmission Control Module (TCM): A computer that controls the transmission's functions.
OBD-II: On-Board Diagnostics, a standardized system in vehicles for self-diagnosing and reporting.
• Use an OBD-II scanner to verify the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the transmission fluid pressure sensor/switch for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty transmission fluid pressure sensor/switch.
• Reprogram or replace the Transmission Control Module (TCM) if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regular transmission fluid checks and changes
• Routine inspection of wiring and connectors
• Timely servicing of the transmission system
Sensor Issue
• Do not ignore the Check Engine Light; get it checked soon.
• Avoid driving aggressively until the issue is resolved.
• Consult a professional mechanic if unsure about the repair.
Check your vehicle's warranty; powertrain warranties often cover transmission components.
This code has been more prevalent in vehicles with higher mileage and those with less frequent transmission maintenance.
Moderate – It may not cause immediate damage, but it should be addressed to avoid transmission issues.
Driving with a faulty transmission can be dangerous and may lead to further damage. Always ensure your vehicle is safe to operate.
• Vehicle at operating temperature
• Transmission in normal operating mode
The transmission fluid pressure sensor/switch is typically located on the transmission housing.
Q: Can I drive with a P0873 code?
A: It's not recommended to drive for extended periods with this code as it may lead to transmission issues.
Q: How do I clear a P0873 code?
A: You can clear the code with an OBD-II scanner, but it's important to fix the underlying issue first.
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