What Does P0874 Mean?
The TCM has detected an intermittent fault in the transmission fluid pressure sensor/switch 'C' circuit. The signal is cutting in and out, spiking, or showing erratic behavior that doesn't match expected pressure patterns. Intermittent codes often point to connection issues that are worsened by vibration, heat cycling, or movement.
Common Causes
35%
Loose or corroded connector at pressure sensor 'C'
25%
Chafed or intermittently broken wire in sensor harness
20%
Failing pressure sensor 'C' with intermittent internal contact
12%
TCM connector pin fitment issue causing intermittent contact
8%
Transmission fluid contamination affecting sensor diaphragm intermittently
Diagnostic Steps
1
Monitor live data for sensor 'C' while tapping on the sensor and wiggling the connector — watch for signal dropouts or spikes.
2
Inspect the sensor connector for backed-out pins, spread terminals, or corrosion; clean with electrical contact cleaner.
3
Perform a wiggle test on the wiring harness from sensor to TCM while monitoring the PID to isolate the intermittent section.
4
Check for proper connector locking — a loose connector will move with vibration and cause intermittent contact.
5
If connector and wiring pass inspection, replace the pressure sensor 'C' as the internal element may have a thermal or mechanical intermittent.
Estimated Repair Cost
$80 - $450
Parts + labor, varies by vehicle and location
The TCM has detected an intermittent fault in the transmission fluid pressure sensor/switch 'C' circuit. The signal is cutting in and out, spiking, or showing erratic behavior that doesn't match expected pressure patterns. Intermittent codes often point to connection issues that are worsened by vibr...
The most common cause of P0874 (Transmission Fluid Pressure Sensor/Switch "C" Circuit Intermittent) is: Loose or corroded connector at pressure sensor 'C'
Typical repair costs for P0874 range from $80 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe to drive short distances. You may notice occasional harsh or erratic shifts. Schedule diagnosis soon as intermittent faults can become permanent failures.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0874 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Hydraulic Pressure Monitoring
Difficulty
Type
Generic (SAE)
Recommended Tools
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