What Does P0846 Mean?
The TCM has determined that the transmission fluid pressure sensor/switch "B" is producing readings that fall outside the expected operating range for the current conditions, or the sensor is not responding appropriately to commanded pressure changes. The pressure reading does not correlate with the TCM's pressure commands.
Common Causes
30%
Degraded or drifting transmission fluid pressure sensor B
25%
Internal hydraulic leak in the B pressure circuit
20%
Sticking valve body or pressure solenoid affecting the B circuit
15%
Contaminated or degraded transmission fluid
10%
High-resistance connection at sensor B
Diagnostic Steps
1
Check the transmission fluid level and condition; service if needed.
2
Compare pressure sensor B live data to factory specs for each gear at various RPMs and loads.
3
If a test port is accessible, install a manual pressure gauge on the B circuit port and compare to the sensor reading.
4
If the manual gauge reads correctly but the sensor does not, replace the pressure sensor B.
5
If both readings are out of range, investigate the valve body, pressure solenoid, and internal seals for that circuit.
Estimated Repair Cost
$250 - $1,200
Parts + labor, varies by vehicle and location
The TCM has determined that the transmission fluid pressure sensor/switch "B" is producing readings that fall outside the expected operating range for the current conditions, or the sensor is not responding appropriately to commanded pressure changes. The pressure reading does not correlate with the...
The most common cause of P0846 (Transmission Fluid Pressure Sensor/Switch "B" Circuit Range/Performance) is: Degraded or drifting transmission fluid pressure sensor B
Typical repair costs for P0846 range from $250 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Shifts may be harsh, delayed, or slipping. Avoid towing and aggressive driving. Have the vehicle diagnosed promptly as continued operation with incorrect pressure can accelerate clutch pack wear.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0846 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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