Low battery voltage or weak charging system; Corroded, loose or damaged connectors and wiring in the solenoid power feed; Blown fuse or failing relay supplying the transmission solenoid power; Poor earth connection at the transmission or control module; Damaged internal transmission wiring harness or pass-through connector, possibly from fluid contamination; Shorted solenoid pulling the supply voltage down; Faulty transmission control module.

P1833

A/T Solenoids Power Circuit Low Voltage.

GMC
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 GMC means the transmission control module has detected low voltage on the supply circuit that powers the automatic transmission solenoids. The module compares the solenoid feed voltage with what it expects, and sets the code when the reading stays too low. The cause is usually a fault in the power feed, fuse, relay or wiring rather than the solenoids themselves, but the exact circuit layout depends on the model and transmission.

Symptoms

Malfunction indicator lamp or transmission warning lamp on
Harsh, delayed or missing gear changes
Transmission stuck in one gear (limp mode)
No torque converter lock-up or poor fuel economy
Erratic shifting that comes and goes with vibration or temperature
Other transmission or solenoid-related codes stored alongside

Possible causes

Low battery voltage or weak charging systemlikely
Corroded, loose or damaged connectors and wiring in the solenoid power feedlikely
Blown fuse or failing relay supplying the transmission solenoid powerlikely
Poor earth connection at the transmission or control modulepossible
Damaged internal transmission wiring harness or pass-through connector, possibly from fluid contaminationpossible
Shorted solenoid pulling the supply voltage downpossible
Faulty transmission control modulerare

How to diagnose

Read all stored codes and freeze frame data, noting battery voltage, speed and temperature when the code set, then check for related codes
Test battery condition and charging voltage at idle and under load
Check the fuses and relay in the transmission solenoid power feed, using the wiring diagram for the specific model and transmission
Inspect the external transmission connector, harness and module connector for corrosion, water ingress, chafing and pushed-back pins
Measure voltage drop on the solenoid power feed and the earth circuits with the circuit loaded
Check the transmission fluid level and condition, as contamination can affect the internal harness and connector
Measure solenoid resistance against the manufacturer specification to find a shorted solenoid
Check for any manufacturer software updates for the control module before considering replacement

How to fix

Replace or recharge a weak battery and repair any charging system fault
Replace the blown fuse or faulty relay after finding why it failed
Repair or replace damaged wiring, clean and secure corroded connectors and earth points
Replace the internal harness or pass-through connector if it is damaged or leaking
Replace any shorted solenoid or solenoid pack, and correct the fluid condition
Replace or reprogram the control module only once all wiring and power supply faults are ruled out

Can I keep driving?

Medium severity

The car can usually be driven carefully for a short time, but the gearbox may go into limp mode and shift harshly. Get it checked soon, as continued driving with poor solenoid control can cause further transmission wear.

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