Blown fuse or faulty relay in the transmission solenoid power feed; Corroded, loose or damaged connector terminals at the transmission or control module; Damaged or chafed wiring in the solenoid supply circuit, causing high resistance or a short to ground; Weak battery or charging system fault causing low system voltage; Poor earth connection for the control module or transmission; Internal short or fault in a solenoid or the transmission wiring harness pulling the supply down; Faulty transmission control module.

P1833

A/T Solenoids Power Circuit Low Voltage.

GM
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

On GM vehicles, P1833 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 system voltage and sets the code when it stays too low, so the solenoids may not be able to operate properly. The exact circuit and fuse or relay arrangement depends on the model and transmission.

Symptoms

Transmission warning light or check engine light on
Transmission stuck in one gear (limp mode)
Harsh, delayed or no gear shifts
No torque converter clutch lock-up
Erratic shifting or the gearbox dropping out of gear intermittently
Poorer fuel economy

Possible causes

Blown fuse or faulty relay in the transmission solenoid power feedlikely
Corroded, loose or damaged connector terminals at the transmission or control modulelikely
Damaged or chafed wiring in the solenoid supply circuit, causing high resistance or a short to groundlikely
Weak battery or charging system fault causing low system voltagepossible
Poor earth connection for the control module or transmissionpossible
Internal short or fault in a solenoid or the transmission wiring harness pulling the supply downpossible
Faulty transmission control modulerare

How to diagnose

Read all stored and pending codes and record the freeze frame data, noting battery voltage and conditions when the code set
Check battery condition and charging voltage with the engine running, and fix any low-voltage problems first
Inspect the fuse and relay for the transmission solenoid supply using the wiring diagram for the specific model
Inspect the wiring and connectors at the transmission, the control module and the supply circuit for corrosion, water ingress, chafing or pin damage
Check the voltage drop on the solenoid power feed and the earth circuits under load with a multimeter
Test the supply circuit for shorts to ground and for resistance against the manufacturer's specification
Check solenoid and internal harness resistance against specification, as the procedure varies by transmission
Clear the code and road test to confirm it does not return, checking for other related codes

How to fix

Replace the blown fuse or faulty relay once the cause of the failure has been found
Clean or repair corroded connectors and terminals, replacing damaged ones
Repair or replace damaged wiring in the solenoid supply or earth circuits
Repair the battery or charging system fault, or replace the battery if it is weak
Replace the faulty solenoid or internal transmission harness if testing shows a short
Replace or reprogram the transmission control module only after wiring and supply faults have been ruled out

Can I keep driving?

Medium severity

The car may go into limp mode with limited gears, and shifting problems can stress the transmission. Avoid long journeys and heavy loads, and have it diagnosed soon.

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