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P0749 – Pressure Control Solenoid Intermittent (OBD2)

P0749 means "Pressure Control Solenoid Intermittent". The pressure control solenoid signal briefly drops out or jumps. The fault comes and goes – often with vibration, heat or moisture – so the part may test fine in the workshop.

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P0749 quick summary

Fault codeP0749
MeaningPressure Control Solenoid Intermittent
SystemPowertrain (Engine & Transmission)
VehiclesGeneric OBD2
SeverityHigh
Can I drive?Only carefully and preferably to a workshop. Harsh or slipping shifts can damage the gearbox.
Repair cost€100 – €2,000

How pressure control solenoids work

Pressure control solenoids set the hydraulic pressure that engages the gearbox clutches; these codes cover their electrical circuits and performance.

In an automatic gearbox, the clutches and brakes are applied by hydraulic pressure. Pressure control solenoids (often labelled A, B, C) in the valve body regulate main line pressure and the pressure for individual clutches. The control unit drives them with a variable current to make shifts smooth.

Codes P0745–P0749, P0775–P0779, P0795–P0799 and P0960–P0971 report circuit faults (open, low, high, electrical), performance or stuck off, stuck on and intermittent faults.

Wrong pressure causes harsh or slipping shifts and often limp mode. Besides solenoid failures, dirty fluid and worn valve bodies are common causes.

On VAG vehicles (VW, Audi, Škoda, Seat, Cupra), VCDS and older VAG testers can show this code as the five-digit VAG code 17133 (P0749). Both numbers mean the same fault.

Symptoms of P0749

  • Harsh or slipping shifts
  • Limp mode
  • Delayed engagement into Drive or Reverse
  • Check Engine or gearbox warning
  • Shift flare

Most common causes of P0749 (most likely first)

Mechanic's Pro Tip

On many modern gearboxes the solenoids are only sold as part of the valve body or mechatronic unit – but specialist rebuilders often offer individual solenoids or reconditioned units at a much lower price.

  1. 1.Loose or corroded connector pin

    Most likely

    Pins that have spread lose contact as the engine vibrates.

  2. 2.Chafed wire that shorts only now and then

    Often where the harness moves with the engine.

  3. 3.Internal intermittent fault in the pressure control solenoid

  4. 4.Faulty pressure control solenoid

  5. 5.Dirty or degraded gearbox fluid

  6. 6.Worn or sticking valve body

  7. 7.Transmission control unit fault

Step-by-step diagnostic guide

  1. 1

    Read codes and pressure data

    Read the transmission codes and, where available, commanded and actual pressures or solenoid currents.

  2. 2

    Do a wiggle test

    With the engine running and the pressure control solenoid value in live data, gently move the harness and connector. If the value jumps or the code returns, the fault is in that section. Also check pin tension with a matching terminal.

  3. 3

    Check fluid

    Check fluid level and condition and look for debris.

  4. 4

    Measure the solenoid

    Measure the solenoid resistance through the gearbox connector.

    Multimeter: Variable force/pressure solenoids often read about 3–8 Ω; check the specification.

  5. 5

    Check line pressure

    Measure line pressure with a gauge if the gearbox has a test port.

  6. 6

    Repair and adapt

    Replace the solenoid, valve body or harness as needed, change the fluid and run the adaptations.

Frequently asked questions

Can I keep driving with P0749?

Only carefully and preferably to a workshop. Harsh or slipping shifts can damage the gearbox.

How much does it cost to fix P0749?

Typical repair costs are 100 € – 2000 €, depending on the cause and the vehicle. The most common fixes are: loose or corroded connector pin; chafed wire that shorts only now and then; internal intermittent fault in the pressure control solenoid. Always confirm the cause with the tests above before buying parts.

What does a pressure control solenoid do?

It regulates the hydraulic pressure that engages the clutches, so shifts are firm but smooth.

Can dirty fluid cause these codes?

Yes. Debris and degraded fluid can make the solenoids and valves stick.

What is the difference between P0749 and similar codes?

P0749 belongs to a group of codes for the same component that differ in the type or location of the fault: P0746 – Pressure Control Solenoid Performance or Stuck Off; P0747 – Pressure Control Solenoid Stuck On; P0748 – Pressure Control Solenoid Electrical; P0775 – Pressure Control Solenoid B; P0776 – Pressure Control Solenoid B Performance or Stuck off; P0777 – Pressure Control Solenoid B Stuck On. The tests on this page apply to the whole group; the type of fault tells you where to start.

Related fault codes

This guide is for information only. Working on vehicles can be dangerous — if you are unsure, have the car checked by a qualified mechanic. Values can differ between model years; always check the manufacturer's repair information.