What Does P0844 Mean?
The TCM has detected an intermittent signal from the transmission fluid pressure sensor/switch "A" circuit. The signal voltage is exhibiting random dropouts, spikes, or fluctuations that do not correspond to actual pressure changes. This typically indicates a loose connection or a sensor developing an internal fault rather than a complete circuit failure.
Common Causes
35%
Loose or intermittent connection at pressure sensor A connector
25%
Chafed or damaged wiring causing intermittent contact
25%
Pressure sensor A developing intermittent internal fault
10%
Transmission fluid contamination intermittently affecting sensor
5%
TCM connector pin contact issue
Diagnostic Steps
1
Monitor the pressure sensor A PID in live data during normal driving for several minutes; record any sudden spikes, dropouts, or erratic readings.
2
Perform a wiggle test on the sensor connector and wiring while observing the live data for signal disruptions.
3
Inspect the connector pins for corrosion, spread terminals, or backed-out pins.
4
Check the internal transmission harness for areas where vibration may cause intermittent contact loss.
5
If connector and wiring tests are inconclusive, replace the pressure sensor A.
6
After repair, clear codes and road-test to confirm the intermittent condition is resolved.
Estimated Repair Cost
$200 - $850
Parts + labor, varies by vehicle and location
The TCM has detected an intermittent signal from the transmission fluid pressure sensor/switch "A" circuit. The signal voltage is exhibiting random dropouts, spikes, or fluctuations that do not correspond to actual pressure changes. This typically indicates a loose connection or a sensor developing ...
The most common cause of P0844 (Transmission Fluid Pressure Sensor/Switch "A" Circuit Intermittent) is: Loose or intermittent connection at pressure sensor A connector
Typical repair costs for P0844 range from $200 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent pressure faults can cause occasional harsh shifts or brief slippage. The vehicle is drivable but transmission behavior may be unpredictable. Have it diagnosed before the intermittent fault becomes a constant one.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0844 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
