P0871 on RAM
Transmission Fluid Pressure Sensor/Switch "C" Circuit Range/Performance
P0871 on RAM vehicles indicates transmission fluid pressure sensor/switch "c" circuit range/performance. Au7o has documented this code across 1 RAM model — most commonly on 1500. This code sets when the transmission control module receives a signal from transmission fluid pressure sensor/switch C that is out of the expected range or implausible for the current conditions. This sensor monitors hydraulic pressure inside the transmission, which the module relies on to control clutch apply and shift quality. Symptoms can include harsh, delayed, or erratic shifts, slipping, or the transmission entering a failsafe mode. The cause is typically the sensor, actual fluid pressure problems, or the wiring. Typical repair costs on RAM range from $300 to $3,500, depending on the specific model and root cause.
Common Causes of P0871
- •Faulty transmission fluid pressure sensor/switch C
- •Low or degraded transmission fluid
- •Internal hydraulic leak or low line pressure
- •Stuck or faulty pressure control solenoid
- •Wiring or connector issues
- •Valve body wear or contamination
- •Faulty transmission control module (less common)
P0871 on RAM by Model
RAM 1500(1 issue)
- ZF 8HP70 8-Speed Torque-Converter Shudder / Harsh Shift / Limp Mode2013-2024
The 8-speed (ZF 8HP70 / TorqueFlite) develops a torque-converter clutch shudder felt as a vibration/judder around 30-50 mph light throttle, along with harsh downshifts, drive-engagement slam, and occasional limp mode (stuck in one gear with CEL). Root causes are degraded/aged transmission fluid and worn torque-converter clutch material, sometimes with valve-body or solenoid issues. Ram markets the trans as 'sealed/lifetime fill,' but ZF recommends fluid service every ~40-60k miles, and skipping it drives most of these complaints.
Looking for P0871 on a different make?
View P0871 across all makes →Frequently Asked Questions
What does P0871 mean on RAM?▼
P0871 stands for "Transmission Fluid Pressure Sensor/Switch "C" Circuit Range/Performance." This code sets when the transmission control module receives a signal from transmission fluid pressure sensor/switch C that is out of the expected range or implausible for the current conditions. This sensor monitors hydraulic pressure inside the transmission, which the module relies on to control clutch apply and shift quality. Symptoms can include harsh, delayed, or erratic shifts, slipping, or the transmission entering a failsafe mode. The cause is typically the sensor, actual fluid pressure problems, or the wiring. On RAM specifically, this code is documented across 1 model.
What causes P0871 on RAM vehicles?▼
Common causes on RAM: Faulty transmission fluid pressure sensor/switch C, Low or degraded transmission fluid, Internal hydraulic leak or low line pressure, Stuck or faulty pressure control solenoid, Wiring or connector issues. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0871 on a RAM?▼
Repair costs on RAM range from $300 to $3,500, depending on the specific model and root cause.
Which RAM models have P0871 documented?▼
Au7o has documented P0871 on 1 RAM model: 1500.