What Does P0987 Mean?
DTC P0987 indicates a general malfunction in the transmission fluid pressure sensor or switch "E" circuit. The TCM is unable to read a valid signal from this sensor, which monitors hydraulic pressure in a specific transmission clutch or band circuit. Without accurate pressure feedback, the TCM cannot verify proper clutch application and may resort to default shift strategies.
Common Causes
35%
Faulty transmission fluid pressure sensor/switch "E" providing no signal or erratic output
25%
Wiring fault (open or short) in the pressure sensor circuit between the sensor and TCM
20%
Corroded or damaged connector pins at the transmission pressure sensor
10%
Transmission fluid contamination causing sensor fouling or blockage at the pressure port
10%
TCM internal circuit fault on the pressure sensor input
Diagnostic Steps
1
Use the scan tool to read the live data for transmission pressure sensor "E"; verify whether the reading is absent, fixed at zero, or showing an impossible value.
2
Inspect the wiring and connector at the pressure sensor for physical damage, corrosion, ATF contamination, or loose connections.
3
Measure voltage and ground supply at the sensor connector with the key on; verify the sensor is receiving proper reference voltage (typically 5V) and has a clean ground.
4
If the supply voltages are correct, measure the sensor output signal; compare to expected values at idle and under load.
5
If the sensor appears faulty, replace it and clear codes; monitor live data to confirm the new sensor provides stable, plausible pressure readings across operating conditions.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
DTC P0987 indicates a general malfunction in the transmission fluid pressure sensor or switch "E" circuit. The TCM is unable to read a valid signal from this sensor, which monitors hydraulic pressure in a specific transmission clutch or band circuit. Without accurate pressure feedback, the TCM canno...
The most common cause of P0987 (Transmission Fluid Pressure Sensor/Switch "E" Circuit) is: Faulty transmission fluid pressure sensor/switch "E" providing no signal or erratic output
Typical repair costs for P0987 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Loss of pressure feedback can lead to improper clutch application pressures, causing slippage or harsh engagement. While not immediately dangerous, prolonged operation can cause accelerated transmission wear and eventual failure.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0987 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission
Difficulty
Type
Generic (SAE)
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