What Does P0848 Mean?
The TCM has detected that the voltage from the transmission fluid pressure sensor/switch "B" circuit is above the maximum allowable threshold. This high voltage indicates an open sensor, disconnected connector, broken signal wire, or a short to battery voltage. The TCM cannot obtain valid pressure feedback from the B circuit.
Common Causes
35%
Open or failed transmission fluid pressure sensor B
25%
Disconnected sensor B connector
20%
Open circuit in signal wire
15%
Short to battery voltage in the signal wire
5%
TCM connector or internal input failure
Diagnostic Steps
1
Confirm the pressure sensor B PID reads at or near maximum voltage (approximately 5V), verifying the high circuit condition.
2
Verify the sensor B connector is fully seated — check whether it was left disconnected after recent transmission work.
3
Measure the sensor resistance; an open/infinite reading confirms sensor failure.
4
With the sensor disconnected, check the signal wire for a short to battery voltage.
5
Test continuity of the signal, ground, and reference wires from the sensor to the TCM connector.
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The TCM has detected that the voltage from the transmission fluid pressure sensor/switch "B" circuit is above the maximum allowable threshold. This high voltage indicates an open sensor, disconnected connector, broken signal wire, or a short to battery voltage. The TCM cannot obtain valid pressure f...
The most common cause of P0848 (Transmission Fluid Pressure Sensor/Switch "B" Circuit High) is: Open or failed transmission fluid pressure sensor B
Typical repair costs for P0848 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Shift quality will be compromised and the transmission may enter limp mode. The vehicle can be driven at reduced capability for short distances. Prompt repair is recommended.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0848 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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