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P1831

PC Solenoid Power Circuit Low Voltage.

  • Chevrolet
  • 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 Chevrolet means the transmission control module saw low voltage on the power supply circuit feeding the pressure control (PC) solenoid. The PC solenoid sets line pressure in the automatic gearbox, so the module checks that its supply voltage is within range. If the voltage is lower than expected, the code sets and the module may change how the transmission operates.

Symptoms

  • Transmission warning light or check engine light on
  • Harsh, delayed or flared gear changes
  • Transmission stuck in one gear (limp mode)
  • Loss of normal shift pattern or no upshifts
  • Erratic or slipping shifts under load

Possible causes

  • Open circuit, high resistance or blown fuse in the PC solenoid power supply feedlikely
  • Corroded, loose or damaged wiring or connector at the transmission, internal harness or TCMlikely
  • Short to ground in the solenoid supply wiring, or a chafed harnesspossible
  • Faulty PC solenoid with a low-resistance or shorted coil pulling the supply downpossible
  • Low battery or charging system voltage, or poor battery or earth connectionspossible
  • Faulty transmission control module or internal driver faultrare

How to diagnose

  1. Read all stored codes and freeze frame data, noting battery voltage and conditions when the code set, and check for any charging or other power supply codes
  2. Check battery condition, charging voltage and the main earth and power connections
  3. Find the PC solenoid supply fuse in the wiring diagram for the model and check it for continuity and voltage under load
  4. Inspect the transmission harness, connector and TCM plugs for corrosion, bent pins, water ingress and chafing
  5. Voltage drop test the solenoid supply circuit with the ignition on and the circuit loaded, and check for a short to ground with the circuit unplugged
  6. Measure the PC solenoid coil resistance and compare it with the specification for that transmission
  7. Check the internal transmission wiring and pass-through connector, as layout depends on the model and gearbox
  8. Only after wiring, supply and solenoid are proven good, test or replace the TCM and check for a relevant software update

How to fix

  • Replace a blown fuse only after finding and fixing the cause of the overload
  • Repair or replace damaged wiring, terminals or connectors in the supply circuit
  • Clean and secure corroded or loose battery, earth and connector contacts
  • Replace the PC solenoid or the solenoid assembly if its coil resistance is out of specification
  • Repair the battery or charging fault if system voltage is low
  • Repair or replace the TCM, with any required programming, if it is confirmed faulty

Can I keep driving?

Medium severity

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

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

This code for other makes

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