Blown fuse or poor connection in the transmission solenoid power supply feed; Corroded, loose or damaged wiring or connector at the transmission control module or transmission case connector; Weak battery or low charging system voltage; Poor ignition feed or earth connection to the control module; Internal short or high resistance in a solenoid or the internal transmission wiring loom pulling the supply down; Faulty transmission control module (power driver circuit).

P1833

A/T Solenoids Power Circuit Low Voltage.

Buick
Powertrain
Manufacturer code
Medium severity

How this code is built

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

What it means

P1833 on a Buick means the transmission control module has detected low voltage on the supply feeding the automatic transmission solenoids. The control unit compares the solenoid power feed with what it expects when the ignition is on or the solenoids are commanded, and sets the code when the voltage is too low. The exact supply route, fuse and relay arrangement depend on the model, engine and transmission.

Symptoms

Transmission warning light or check engine light on
Transmission stuck in one gear (limp mode) or no gear changes
Harsh, delayed or erratic shifts
No torque converter clutch lock-up
Poor fuel economy
Intermittent fault that comes and goes with vibration or battery condition

Possible causes

Blown fuse or poor connection in the transmission solenoid power supply feedlikely
Corroded, loose or damaged wiring or connector at the transmission control module or transmission case connectorlikely
Weak battery or low charging system voltagepossible
Poor ignition feed or earth connection to the control modulepossible
Internal short or high resistance in a solenoid or the internal transmission wiring loom pulling the supply downpossible
Faulty transmission control module (power driver circuit)rare

How to diagnose

Read all stored codes and freeze frame data, noting battery voltage, gear and engine state when the code set, and check for other electrical or charging codes
Check battery condition and charging voltage with the engine running; correct any low voltage first
Look up the wiring diagram for the model and find the solenoid power fuse and any relay; test the fuse and check for voltage drop under load
Inspect the transmission case connector and control module connectors for corrosion, bent pins, fluid ingress and chafed wires
Check the supply wire for voltage with the ignition on and again while wiggling the harness to find intermittent faults
Check control module earth and ignition feed circuits for voltage drop
Measure solenoid resistance at the transmission connector and compare with the specification for that transmission, looking for shorts
Only after wiring and supply are proven good, consider the control module and check for any available updated software

How to fix

Replace the blown fuse after finding and correcting the cause of the overload
Repair or replace damaged wiring and clean or replace corroded connectors and terminals
Replace a weak battery or repair the charging system
Restore poor earth or ignition feed connections
Replace the faulty solenoid or internal wiring loom, with fluid and filter service as the transmission procedure requires
Replace or repair the control module, or apply a manufacturer calibration update if one applies, only once the cause is confirmed

Can I keep driving?

Medium severity

The car can usually be driven carefully to a workshop, but the transmission may go into limp mode and shift harshly. Have it checked soon, as continued use with erratic shifting can cause further transmission wear.

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