P0991

Transmission Fluid Pressure Sensor/Switch E Circuit Intermittent

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Incorrect gear shifting
Enabling automatic transmission emergency mode
Jerks when shifting gears
Check Engine Light Illuminates
Reduced transmission efficiency

Causes

Transmission fluid pressure sensor malfunction
Open or short circuit in the sensor circuit
Oxidation of contacts in connectors
Low transmission fluid level
Transmission fluid contamination

How to Fix

Check the level and condition of the transmission fluid
Visually inspect the sensor wiring and connectors
Check sensor resistance and reference voltage
Replace pressure sensor if necessary
Clean or replace connectors if corroded

Related codes

P0990 P0992 P0993