P0746 — Pressure Control Solenoid A Performance or Stuck Off

OBD2 code P0746 flags a problem with the automatic transmission control (pressure control solenoid a performance or stuck off). Short, gentle driving to a shop is usually possible. Common culprits: low or degraded transmission fluid, failed shift or pressure control solenoid, faulty transmission speed sensor.

powertrain (engine/transmission)

Is it safe to drive?

Drive with caution Drive only if the transmission still shifts predictably, and avoid highway speeds. Driving with slipping or limp mode accelerates internal wear — every kilometre can add to the final repair bill.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm P0746 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the automatic transmission control for damage, corrosion, chafing or poor contact.
Subsystem check Command the pressure control solenoid a performance or on and off with a scanner and watch the feedback signal; then remove and inspect the mechanism for sticking before replacing it.
Subsystem check Check transmission fluid level and condition — dark, burnt fluid points to internal wear.
Subsystem check Read transmission-specific codes and live data (solenoid states, input/output speed) with a capable scanner.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P0746 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P0746 (parts and labor, USD, independent shop rates): Valve body repair or replacement: $700–$1,500; Replace a shift solenoid: $300–$800; Transmission rebuild or replacement: $2,500–$5,500; Transmission fluid service: $150–$350. Overall, fixing P0746 usually costs between $150 and $5,500. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

How do I diagnose P0746 myself?

Start with a scan: confirm P0746, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the pressure control solenoid a performance or, and verify the suspect component against live data before buying parts.

What does OBD2 code P0746 mean?

Is it safe to drive with P0746?

Drive only if the transmission still shifts predictably, and avoid highway speeds. Driving with slipping or limp mode accelerates internal wear — every kilometre can add to the final repair bill.

Will P0746 clear itself?

Sometimes P0746 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What is the most common cause of P0746?

The most common causes are: low or degraded transmission fluid, failed shift or pressure control solenoid, faulty transmission speed sensor.

When your scan tool displays P0746, the transmission control module has identified that the pressure control solenoid A is not behaving as expected. This powertrain fault carries the formal label "Pressure Control Solenoid A Performance or Stuck Off," which tells you the solenoid responsible for managing hydraulic line pressure inside the automatic transmission has either failed to respond to commands, become physically stuck, or is providing feedback that does not match what the computer expects. The module does not flag this code based on a single bad reading; it must observe the fault occur repeatedly under specific operating conditions before illuminating the check engine or transmission warning light.

Automatic transmissions depend on a bank of solenoid valves to direct transmission fluid and regulate pressure precisely during each gear change. The control unit sends electrical signals to these solenoids, which act as on-off or variable valves controlling fluid flow to clutches and bands. When solenoid A does not move when told, line pressure can drop, rise uncontrollably, or remain fixed at an incorrect value. The resulting hydraulic imbalance causes poor shifting, slippage, or a complete failure to engage gears. Freeze frame data stored alongside P0746 captures engine load, RPM, coolant temperature, and vehicle speed at the moment of failure—critical information that helps you reproduce the fault conditions during diagnosis.

Addressing P0746 early prevents cascading damage to the transmission internals. The longer you drive with faulty line pressure control, the more wear you put on clutches, the torque converter, and other components that depend on correct hydraulic pressure. A thorough diagnosis pinpoints whether the problem lies in the solenoid itself, the valve body that houses it, the wiring delivering the signal, or the transmission fluid that transmits the hydraulic force.

Common Symptoms of P0746

The transmission may respond in different ways depending on how severely the solenoid is stuck or failed:

Vehicle enters limp mode, locking the transmission in a single gear
Check engine light or transmission warning indicator illuminates on the dashboard
Noticeable shuddering or vibration at highway speeds
Delayed engagement or slipping between gears under load
Complete loss of forward or reverse movement in severe cases

What Causes P0746?

Multiple factors can trigger this code, ranging from simple maintenance issues to major internal failures:

Solenoid mechanism jammed by accumulated carbon, dirt, or corrosion
Weakened actuator motor or broken spring inside the solenoid assembly
Relay contacts fused shut, holding the circuit in a permanent on or off state
Low, contaminated, or insufficient transmission fluid preventing proper hydraulic operation
Worn or damaged valve body where the solenoid is mounted
Wiring or connector problems in the transmission harness, including chafing, corrosion, or loose terminals
Internal mechanical wear affecting clutches or the torque converter
Faulty transmission input or output speed sensor providing incorrect data to the control module
Complete failure of the shift solenoid or pressure control solenoid itself

How to Diagnose P0746

Follow these steps to confirm the root cause before replacing any components:

Connect an OBD2 scanner, verify that P0746 is stored in the transmission or powertrain control module, and record all freeze frame data—this snapshot shows the exact operating conditions when the fault first appeared.
Pull all stored and pending codes from the module; related codes often point to the true source of the problem. Check manufacturer TSB databases for known issues or software updates that apply to your vehicle.
Perform a visual inspection of the transmission wiring harness and connectors for damage, melted insulation, corrosion, or loose pins that could interrupt the solenoid control signal.
Use a scanner capable of transmission diagnostics to command the pressure control solenoid on and off while monitoring the feedback; then physically inspect the solenoid for sticking, debris, or abnormal resistance if accessible.
Check transmission fluid level and condition—dark, burnt-smelling fluid indicates overheating or internal wear that likely contributed to the solenoid failure.
Review live transmission data including input and output speeds, solenoid state, and line pressure readings if your scanner supports it.
Clear the code, complete a drive cycle that recreates the freeze frame conditions, and verify that P0746 does not return before considering the repair complete.

Repair Options and Costs

Corrective action depends entirely on which component failed and how severely:

Replace a single shift solenoid: $300–$800
Repair or replace the valve body: $700–$1,500
Perform a transmission fluid and filter service: $150–$350
Full transmission rebuild or replacement: $2,500–$5,500

Total cost for fixing P0746 typically falls between $150 and $5,500 depending on the underlying cause. A methodical diagnostic approach saves money by ensuring you address the cheapest probable cause first rather than automatically proceeding to the most expensive repair.

Can You Drive with P0746?

The severity of symptoms determines whether driving is safe. If the transmission still shifts and holds gear without slipping, short distances to a repair facility are acceptable. However, avoid sustained highway driving and any situation requiring quick acceleration. Continued operation with slipping gears or limp mode active accelerates wear on internal clutches and bearings, and every mile driven under those conditions adds to the final repair bill. Once the transmission fails to move or shifts erratically, have the vehicle towed rather than risk further damage.