Transmission Fluid Pressure Sensor/Switch C Circuit Low
The P0872 code means the vehicle's onboard diagnostic system has detected: Transmission Fluid Pressure Sensor/Switch C Circuit Low. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $100 - $500 (parts and labor)
Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.
Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.
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Common Symptoms
- Check Engine Light illuminated
- Slipping in specific gear ranges
- Soft or delayed shifts
- Limp mode in some vehicles
Probable Causes (Ranked by Likelihood)
- Short to ground in pressure sensor C signal wire Very High
- Faulty pressure sensor C with low output High
- Corroded connector at sensor C Moderate
- Low transmission fluid level Moderate
Frequently Asked Questions
Is P0872 the low voltage counterpart of P0873?
Yes, P0872 indicates the sensor C signal is too low while P0873 indicates it is too high. They represent opposite electrical faults.
Can road debris damage the sensor C wiring?
Yes, rocks and road debris can damage the wiring harness on the underside of the vehicle near the transmission, causing shorts to ground.
How do I find sensor C?
Sensor C is typically mounted on the transmission case or valve body. Consult your vehicle service manual for the exact location, as it varies by transmission model.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Check transmission fluid level
-
Measure voltage at pressure sensor C connector
-
Test for short to ground on the signal wire
-
Replace sensor C if wiring and fluid checks are good
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Commonly Affected Vehicles
- 2010-2020 Ford Mustang (10R80)
- 2012-2019 Chevrolet Camaro (8L90)
- 2011-2019 Dodge Charger (ZF 8HP)
- 2013-2020 Ram 1500 (ZF 8HP)
Related Codes
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