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DTC code page

P0749: Pressure Control Solenoid A Intermittent

Quick answer: The controller detected an intermittent fault in the pressure-control solenoid A circuit or command response.

Drivers also search this fault as pressure control solenoid A intermittent, PCS A intermittent fault, intermittent line pressure control code.

Severity: high Family: powertrain Related paths: 9
Meaning

What P0749 usually means

P0749 is the intermittent version of the PCS A family, and that makes it deceptively important. A transmission can shift normally for days, then flare, slam, or drop into protective mode only after a long drive, hot soak, or rough road. That pattern fits an intermittent pressure-control problem well. The fault may come from a harness that opens with movement, a solenoid that changes behavior as it heats up, connector contamination, or a valve-body problem that becomes obvious only when the fluid thins out. It rounds out the pressure-control cluster and gives the site another strong page for realistic owner symptoms.

Fast triage

Start here before chasing parts

  • Scan first: save freeze-frame and pending codes before clearing anything.
  • Confirm the complaint: compare the stored code with current drivability symptoms.
  • Use context: trims, live data, and related codes usually narrow the fault faster than guesswork.
  • Work simplest to hardest: leaks, connectors, maintenance items, and known patterns before expensive components.
Initial checks

What to check first

  • Ask whether the complaint is tied to hot operation, long drives, or certain road conditions, because intermittent pressure faults often need that context.
  • Capture freeze-frame and note exactly how warm the transmission was when the code stored.
  • Inspect the connector early, since intermittent pin tension and fluid contamination are common real-world causes.
Driving risk

Can you keep driving?

P0749 can feel harmless between episodes, but intermittent pressure loss or harsh max-pressure behavior can still accelerate wear. It should not be ignored if the transmission is occasionally flaring or slamming shifts.

High urgency: If symptoms are active, reduce driving and diagnose quickly before secondary damage builds.
Likely causes

Common causes behind this code

  • Pressure-control solenoid A fails intermittently as temperature changes
  • Harness or connector fault opens only with movement, vibration, or heat
  • Fluid contamination or valve-body wear causes pressure instability only when hot
  • Shared power or ground problem intermittently disrupts PCS A control
  • Controller driver issue that drops or distorts command unpredictably

Cause phrases often tied to this code: intermittent pressure control solenoid, heat-sensitive harness fault, connector contamination, valve body issue when hot, intermittent TCM driver problem.

Diagnostic order

Suggested workflow

  1. Review freeze-frame and determine whether the problem appears only hot, only after long drives, or only with vibration.
  2. Road test long enough to reproduce the complaint while monitoring commanded pressure strategy and shift behavior.
  3. Inspect and manipulate the external harness and connector while checking for intermittent electrical dropouts.
  4. If the electrical side stays stable, widen the diagnosis to a heat-sensitive solenoid or valve-body pressure-control issue.
  5. After repair, confirm the transmission remains stable through the same long, warm operating conditions that used to trigger the code.
Avoid guesswork

Common mistakes

  • Declaring the fault fixed because the transmission behaves normally on a short cold drive.
  • Replacing major components without first proving the intermittent pattern electrically.
  • Ignoring how much the complaint depends on temperature and trip length.
Repair path

Practical fix guidance

  • Treat P0749 like a time-and-heat problem, not just a parts list problem.
  • Prioritize connector, harness, and solenoid verification before condemning the transmission internally.
  • Validate the fix with a realistic warm road test long enough to challenge the original failure condition.
Vehicle context

Affected brands in this MVP

Brand hubs help broaden internal linking now and can evolve into make-specific diagnostic notes later.

Aliases and common searches

English phrases tied to P0749

Useful when the driver knows the wording but not the exact DTC yet.

  • pressure control solenoid A intermittent
  • PCS A intermittent fault
  • intermittent line pressure control code
Related search intent

Queries this page can answer naturally

  • P0749 code meaning
  • what does P0749 mean
  • pressure control solenoid A intermittent
  • PCS A intermittent symptoms
FAQ

Quick questions about P0749

Can P0749 come and go with no code for days?

Yes. Intermittent harness, connector, or heat-related solenoid faults can disappear until the same conditions return.

Is P0749 always electrical?

No. The intermittent behavior can come from wiring, the solenoid, the valve body, or a pressure-control issue that only shows up when hot.

Why does P0749 often take longer to diagnose?

Because the failure may require specific heat, drive time, or vibration before it becomes visible.