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P1823

Pressure Control Solenoid 3 Electrical.

  • Volkswagen
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
8
AreaTransmission
23
FaultThe specific fault in that area

What it means

On Volkswagen vehicles, P1823 means the transmission control unit has detected an electrical fault in the circuit for pressure control solenoid 3 inside the automatic gearbox. The unit saw an open circuit, short circuit or a resistance outside the expected range when it checked the solenoid. Which clutch or function this solenoid controls depends on the gearbox type, so confirm that against model-specific information.

Symptoms

  • Gearbox warning light or gear selector warning in the dash
  • Gearbox goes into limp-home mode, often stuck in one gear
  • Harsh, delayed or flaring gear changes
  • Loss of certain gears or no manual shift control
  • Reduced performance or poor fuel economy

Possible causes

  • Faulty pressure control solenoid 3 (open or shorted coil)likely
  • Damaged, chafed or corroded wiring between the solenoid and the transmission control unitlikely
  • Poor connection or contamination at the gearbox internal connector or plug, including fluid ingresslikely
  • Faulty or water-damaged valve body or mechatronic unit with internal wiring faultpossible
  • Low battery voltage or poor earth causing false electrical readingspossible
  • Faulty transmission control unit driver circuitrare

How to diagnose

  1. Read all stored codes and freeze frame data, noting any other gearbox or battery voltage faults, then clear and see if P1823 returns
  2. Check battery condition and charging voltage, and inspect main earth connections
  3. Visually inspect the gearbox wiring harness and connectors for chafing, heat damage, corrosion and fluid contamination
  4. Check the gearbox fluid level and condition against the manufacturer's procedure for that gearbox, as it often needs a specific temperature
  5. Measure the solenoid coil resistance and compare with the model-specific specification
  6. Test the wiring for continuity, short to earth and short to supply between the solenoid and control unit
  7. Use live data to check the solenoid commanded and actual values while operating the gearbox
  8. Check for relevant technical bulletins or software updates for that gearbox before condemning the control unit

How to fix

  • Replace the faulty pressure control solenoid or the assembly that contains it, as the design requires
  • Repair or replace damaged wiring and terminals
  • Clean, dry and refit the connectors, or replace them if corroded or leaking
  • Replace the valve body or mechatronic unit if the internal fault is confirmed
  • Correct battery or earth faults
  • Renew the gearbox fluid and filter where required, and repair or replace the control unit only if all else is proven good

Can I keep driving?

Medium severity

The car can usually be driven carefully in limp mode for a short distance, but gearbox damage may follow if the fault persists. Book diagnosis soon and avoid heavy loads or towing.

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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