Code
P0875
Generic
P — Powertrain
Transmission Fluid Pressure Sensor/Switch D Circuit
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the sensor/switch D circuit
- Corroded, bent or disconnected connector/pins at the sensor or control module
- Failed transmission fluid pressure sensor or pressure switch D
- Bad ground or missing reference voltage to the sensor
- Intermittent harness damage (chafing, pinched, water intrusion)
- Faulty PCM/TCM (less common)
Symptoms
- Check Engine / MIL illuminated
- Transmission may shift harshly, erratically, or stay in limp/limitation mode
- Delayed or slipping shifts
- Stored transmission-related trouble codes and possible reduced performance
- Intermittent transmission behavior if the fault is intermittent
What to check
- Read stored codes and freeze-frame data with a scan tool; note related transmission codes
- Check transmission fluid level and condition (contamination, burnt smell)
- Visually inspect sensor connector and wiring for damage, corrosion, loose pins
- Backprobe the sensor connector and monitor signal while key ON and engine running
- Check reference voltage and ground at the sensor connector (usually 5V ref and ground)
- Measure continuity/resistance between sensor connector and TCM connector for open/shorts
Signal parameters
- Reference voltage: typically ~5.0 V (check vehicle-specific spec)
- Signal type: may be a switch (open/closed) or analog pressure sensor (voltage proportional to pressure)
- Analog sensor typical range: ~0.5 V (low pressure) to ~4.5 V (high pressure) — vehicle-specific
- Switch-type: expected logic present (near 0 V when active or near reference voltage when inactive) — confirm with OEM wiring diagram
- Resistance: switch closed ≈ near 0 Ω (or very low); open = infinite/OL (if switch type)
Diagnostic algorithm
- Retrieve all codes and freeze-frame data. Note if other transmission or powertrain codes are present.
- Verify transmission fluid level and condition; correct if low or contaminated before further testing.
- Visually inspect the pressure sensor/switch D connector and wiring for damage, corrosion, or loose pins.
- With key ON (engine OFF) and then with engine running as required, backprobe the sensor connector and observe: reference voltage, signal voltage, and ground integrity using a digital multimeter or oscilloscope.
- If no reference or ground, trace and repair the power/ground circuit between the sensor and PCM/TCM; check fuses and ground points.
- If reference and ground are good but signal is out of expected range or intermittent, measure continuity between sensor and module to check for opens/shorts.
Likely causes
- Damaged connector or corroded terminals at the pressure sensor
- Broken wire or internal short between sensor and TCM
- Failed pressure sensor/switch D (internal short or open)
- Poor ground or missing 5V reference from module
- Harness rubbed through at frame/body or routed near hot components
Fault status
Status
Transmission Fluid Pressure Sensor/Switch D Circuit — electrical fault detected in the sensor/switch D circuit (open, short, or out-of-range signal).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Repair manuals
Brands with available manuals
8,828
The library contains 8,828 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email