P0870 on RAM
Transmission Fluid Pressure Sensor/Switch 'C' Circuit
P0870 on RAM vehicles indicates transmission fluid pressure sensor/switch 'c' circuit. Au7o has documented this code across 1 RAM model — most commonly on 1500. General fault in the transmission fluid pressure sensor/switch 'C' circuit. Signal missing or implausible. Typical repair costs on RAM range from $150 to $500, depending on the specific model and root cause.
Common Causes of P0870
- •Faulty pressure sensor/switch C
- •Open or shorted wiring
- •Corroded connector
- •Internal TCM fault
P0870 on RAM by Model
RAM 1500(1 issue)
- 42RE/46RE Governor Pressure Solenoid and Sensor Failure — Limp Mode / Wrong-Gear Start1994-2001
The electronically-controlled 42RE/46RE automatics regulate shift points with a PWM governor pressure solenoid plus a governor pressure sensor/transducer in the valve body. These parts get contaminated by transmission varnish and wear out. When the sensor feedback no longer matches the commanded pressure, the PCM sets a code and drops the transmission into 'limp' mode — no overdrive, 2nd/3rd-gear start, harsh or no shifts. Extremely common on high-mileage 2nd-gen Rams.
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View P0870 across all makes →Frequently Asked Questions
What does P0870 mean on RAM?▼
P0870 stands for "Transmission Fluid Pressure Sensor/Switch 'C' Circuit." General fault in the transmission fluid pressure sensor/switch 'C' circuit. Signal missing or implausible. On RAM specifically, this code is documented across 1 model.
What causes P0870 on RAM vehicles?▼
Common causes on RAM: Faulty pressure sensor/switch C, Open or shorted wiring, Corroded connector, Internal TCM fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0870 on a RAM?▼
Repair costs on RAM range from $150 to $500, depending on the specific model and root cause.
Which RAM models have P0870 documented?▼
Au7o has documented P0870 on 1 RAM model: 1500.