Transmission Fluid Pressure Sensor/Switch D Circuit Low
The P0877 code means the vehicle's onboard diagnostic system has detected: Transmission Fluid Pressure Sensor/Switch D 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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What Are the Symptoms of P0877?
- Check Engine Light illuminated
- Slipping during specific gear changes
- Delayed engagement in certain gears
- Transmission may limit gear range
What Causes P0877? (Most Likely First)
- Short to ground in pressure sensor D signal wire Very High
- Faulty pressure sensor D producing low voltage High
- Corroded connector at sensor D Moderate
- Low transmission fluid level Moderate
Can I Still Drive with P0877?
Short distances only. P0877 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
Can I check the fluid level myself?
Many modern vehicles no longer have a traditional dipstick. Check your owner's manual for the correct fluid level check procedure, which may require a scan tool on some models.
Is sensor D in a hard-to-reach location?
Sensor D location varies by transmission. On some models it is externally accessible, while on others it may require removing the transmission pan or valve body.
Can a leak at the sensor cause P0877?
A leak at the sensor seal can lower local pressure and also allow fluid to reach the connector, potentially causing a short. Inspect the area around the sensor for wetness.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0877?
-
Check transmission fluid level first
-
Measure voltage at pressure sensor D connector
-
Test for short to ground in the signal wire
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Replace sensor D if wiring and fluid are confirmed good
Sources 2
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)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P0877?
- 2017-2020 Ford Explorer (10R80)
- 2015-2019 GM Tahoe (8L90)
- 2014-2020 Jeep Grand Cherokee (ZF 8HP)
- 2016-2020 Acura MDX
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