Blown fuse or poor connection in the PC solenoid supply feed; Corroded, loose or damaged connector at the transmission or control module; Chafed or damaged wiring causing a short to ground or high resistance on the supply circuit; Low battery or charging system voltage; Faulty PC solenoid with internal short drawing the supply down; Internal fault in the transmission control module; Internal transmission harness damage or fluid contamination affecting the solenoid circuit.

P1831

PC Solenoid Power Circuit Low Voltage.

Saturn
Powertrain
Manufacturer code
Medium severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
8: AreaTransmission
31: FaultThe specific fault in that area

What it means

P1831 on a Saturn means the transmission control module has detected low voltage on the supply feed to the pressure control (PC) solenoid circuit. The PC solenoid sets line pressure in the automatic gearbox, so if its supply voltage is lower than expected the module logs the fault and may change how the transmission behaves. The exact supply arrangement and fuse or relay layout depend on the model and transmission, so check the wiring information for the specific car.

Symptoms

Harsh, delayed or flared gear changes
Transmission stuck in one gear (limp mode)
Automatic gearbox warning or check engine light on
Slipping under load or loss of drive
Erratic or no line pressure related behaviour such as bangs on engagement

Possible causes

Blown fuse or poor connection in the PC solenoid supply feedlikely
Corroded, loose or damaged connector at the transmission or control modulelikely
Chafed or damaged wiring causing a short to ground or high resistance on the supply circuitlikely
Low battery or charging system voltagepossible
Faulty PC solenoid with internal short drawing the supply downpossible
Internal fault in the transmission control modulerare
Internal transmission harness damage or fluid contamination affecting the solenoid circuitrare

How to diagnose

Read all stored codes and freeze frame data, noting battery voltage and conditions when the fault set, and check for other power supply or charging codes
Test the battery and check the charging voltage with the engine running
Check the relevant fuses and relays for the transmission supply, using the wiring diagram for the specific model
Inspect the transmission connector and control module connector for corrosion, bent pins, water ingress and fluid leaks
Inspect the harness along its route for chafing, heat damage or rubbing, and wiggle test it while watching live data
Measure the supply voltage at the solenoid connector with the ignition on and under load, and check for voltage drop
Check the PC solenoid resistance against the manufacturer specification and check for a short to ground
Check the transmission fluid level and condition, as debris or contamination can damage the solenoid and internal wiring

How to fix

Replace the blown fuse only after finding and fixing the cause of the overload
Clean, repair or replace faulty connectors and terminals
Repair or replace damaged wiring on the supply circuit
Restore battery and charging system health if voltage is low
Replace the PC solenoid or internal transmission harness if testing shows it is faulty
Repair or replace the transmission control module only after the wiring and solenoid have been proven good

Can I keep driving?

Medium severity

The car may be driveable in limp mode, but harsh shifts and incorrect line pressure can wear the clutches and damage the gearbox. Get it checked soon and avoid heavy loads or long journeys until it is fixed.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.