Transmission Fluid Pressure Sensor/Switch C Circuit Low
What it means
P0872 means the transmission control module reads an abnormally low voltage from the "C" fluid-pressure sensor/switch, one of the sensors that report hydraulic line pressure inside the transmission. The engine still runs, but with a low or missing pressure signal the transmission may slip, shift roughly, or run hot. Because slipping and heat can damage the transmission, it's worth diagnosing without much delay.
Can I keep driving? The engine starts and runs, but the transmission may slip, shift harshly, or overheat; keep driving to a minimum until it's checked to protect the transmission.
Real-world scan data
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check-engine light on
- Transmission slips or won't shift properly
- Harsh or erratic gear changes
- Transmission running hot
Common causes
Most likely first
- Faulty transmission fluid pressure sensor/switch CLikely
- Open or short to ground in the sensor wiring (reads low)Common
- Damaged or corroded connector at the sensorCommon
- Failed transmission control module (TCM)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check transmission fluid level and condition.
- Inspect the pressure-sensor connector and wiring for damage, corrosion, or shorts to ground.
- Compare the sensor's signal voltage against service data; replace the pressure sensor/switch if out of range.
- If wiring and sensor are good, suspect the TCM. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0872?+
Can I just clear P0872?+
Related codes
Read & clear P0872 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.