What Does P0841 Mean?
The TCM has determined that the transmission fluid pressure sensor/switch "A" is reporting values outside its expected range for the current operating conditions, or the sensor response does not match commanded pressure changes. The actual pressure reading does not correlate with what the pressure control solenoid is being commanded to produce.
Common Causes
30%
Degraded or failing transmission fluid pressure sensor A
25%
Internal transmission hydraulic leak reducing actual line pressure
20%
Sticking pressure control solenoid or valve body issue
15%
Contaminated or degraded transmission fluid
10%
High-resistance connection at sensor or TCM
Diagnostic Steps
1
Check transmission fluid level and condition; perform a fluid and filter change if the fluid is dark or has debris.
2
Compare pressure sensor A live data readings against manufacturer specifications for each gear at idle and under load.
3
Install a manual pressure gauge on the main line pressure test port and compare mechanical readings to sensor output to isolate the sensor versus a real pressure problem.
4
If the gauge shows correct pressure but the sensor does not, replace the pressure sensor A.
5
If both the gauge and sensor show low pressure, inspect the valve body, pressure control solenoid, and internal seals for leaks.
Estimated Repair Cost
$250 - $1,200
Parts + labor, varies by vehicle and location
The TCM has determined that the transmission fluid pressure sensor/switch "A" is reporting values outside its expected range for the current operating conditions, or the sensor response does not match commanded pressure changes. The actual pressure reading does not correlate with what the pressure c...
The most common cause of P0841 (Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/Performance) is: Degraded or failing transmission fluid pressure sensor A
Typical repair costs for P0841 range from $250 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Shift quality will be noticeably affected. The transmission may slip under load or shift harshly. Avoid towing or heavy acceleration. Have the vehicle inspected promptly as continued driving with incorrect line pressure can damage clutch packs.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0841 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Generic (SAE)
Recommended Tools
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