P0844 - Transmission Fluid Pressure Sensor/Switch "A" Circuit Intermittent

The TCM saw a transmission hydraulic pressure signal outside the expected range, pointing to a pressure sensor fault, wiring issue, low fluid pressure, or an internal transmission problem.

Code Overview

The TCM saw a transmission hydraulic pressure signal outside the expected range, pointing to a pressure sensor fault, wiring issue, low fluid pressure, or an internal transmission problem.

Common Causes

• Faulty pressure sensor or switch
• Low or dirty transmission fluid
• Harness or connector damage
• Internal hydraulic or valve-body issue

Diagnostic Steps

1. Check transmission fluid level and condition
2. Inspect the transmission connector and harness for oil intrusion or damage
3. Compare sensor readings to commanded values with a scan tool
4. Do not condemn the transmission before verifying power, ground, and reference signals

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

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Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.