P2825 moderate

Transmission Fluid Pressure Sensor/Switch F Circuit Low

The P2825 code means the vehicle's onboard diagnostic system has detected: Transmission Fluid Pressure Sensor/Switch F Circuit Low. This is a moderate severity code.

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Keep driving?: Short distances only
DIY difficulty: hard
Estimated cost: $150 - $600 (parts and labor)

Check Your Fluid First

ANCEL AD310 OBD-II Scanner

Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.

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Read Transmission Codes

LAUNCH CRP123X (Reads All Systems)

Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.

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Common Symptoms

F circuit pressure reading artificially high
TCM reducing commanded pressure incorrectly
Potential clutch slippage from pressure reduction
Check engine light on

Probable Causes (Ranked by Likelihood)

Sensor F shorted to ground Very High
Internal sensor F failure High
Wiring short to ground Moderate
TCM F input pulled low Low

Step-by-Step Diagnostic Procedure

Measure sensor F signal voltage
Check for short to ground in wiring
Replace sensor and compare readings
Test TCM F input independently

Frequently Asked Questions

How does a low sensor reading cause slippage?

The TCM sees higher-than-actual pressure and reduces its pressure command. The actual pressure then drops below what the clutch needs to hold, causing slipping.

Can P2825 cause long-term transmission damage?

Yes. If the reduced pressure causes consistent clutch slipping, the clutch material wears prematurely and the fluid overheats from friction.

Is sensor F the same on all transmissions?

No. Each transmission model has specific sensors calibrated for their pressure range and signal characteristics. Always match the sensor to your transmission.