Code Fault Location Probable Cause
P0776 Force per unit area command solenoid B -performance or stuck off
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What Does Code P0776 Mean?

SPECIAL NOTES: Non-professional mechanics should note that if code P0776 occurs on an application with a "filled-for-life" transmission, the wiser option is to refer the vehicle to the dealer, or other competent repair shop for professional diagnosis and repair.

"Filled-for-life" transmissions are not fitted with dipsticks with which to measure the fluid level, and determining the bodily level of the fluid in these transmissions is all but impossible without equipment that only the dealers possess. Thus, removing the oil pan on these transmissions to check the status of the fluid, or to check for the presence of large habiliment particles (evidence of mechanical failure(s)) is NOT recommended, since it is nearly impossible to refill these transmissions with the right amount of transmission fluid.

Behave in heed that over filling a transmission is as bad every bit under filling it and either status can cause catastrophic manual failure. Stop OF SPECIAL NOTES.

OBD Two fault lawmaking P0776 is a generic lawmaking that is divers as "Force per unit area Command solenoid  B – Performance or Stuck Off", and is prepare when the PCM (Powertrain Command Module) detects a difference between the desired transmission fluid pressure level, and the actual transmission fluid pressure at any given moment. While most causes of this code involve malfunctions in the command circuit of the pressure command solenoid, be aware that there are many possible non-electrical causes besides.

Notation: In this definition, the words "stuck off", refers to a condition in which the solenoid that controls the transmission fluid pressure is stuck in the "OFF", or airtight position. In this condition, the pressure level of the transmission fluid cannot be controlled, directed, or regulated at all.

While the setting parameters for this lawmaking vary profoundly betwixt manufacturers, it should be noted that all automatic transmissions depend on pressurized manual fluid to function properly. The pressure is delivered /developed past a pressure level pump that is driven by the engine via the torque converter, and constructive control of the pressurized fluid is essential for efficient gear selection and torque converter lock-up clutch operation.

In terms of operating principles, pressurized transmission fluid needs to be circulated through the transmission casing to provide proper lubrication to moving parts, also as to provide pressure to move, and maintain pressure on clutch packs and planetary gear sets to effect gear changes, and to maintain a particular gear ratio selection.

Thus, to ensure that all parts of the transmission is supplied with both an adequate catamenia of manual fluid, and manual fluid that is pressurized sufficiently to act finer on moving parts, the fluid is passed through a defended pressure control solenoid. Depending on operating conditions such equally throttle opening, engine speed, transmission turbine speed, the currently selected gear, and the vehicle'south route speed, the PCM calculates the force per unit area required for the transmission to react appropriately to changing conditions.

For case, based on electric current operating conditions such equally difficult acceleration, the PCM might instruct the TCM (Transmission Command Module) to initiate a measure of torque converter clutch slippage (to protect transmission components), before selecting a lower gear as an appropriate response to a large, and sudden throttle input. To perform these deportment effectively, the transmission fluid needs to exist at a certain pressure, which the PCM will provide by adjusting the flow charge per unit through the transmission fluid pressure-control solenoid past manipulating the solenoid's opening.

In a fully functional arrangement, these actions are about seamless and the driver is non aware of the procedure. However, in a system that can control neither the flow rate, nor the pressure level of the transmission fluid, the manual cannot react appropriately to inputs such as the large throttle input in our example to a higher place. When this happens, the transmission may slip, gearshifts may go harsh, erratic, or unpredictable, and damage to various transmission components could occur as a result of the torque converter lock-up clutch not functioning every bit it should.

Note that on well-nigh all applications, the PCM will set code P0776 and illuminate a warning light on the first failure wheel. As well, be aware that on some applications, the PCM will initiate a failsafe, or limp manner to protect the transmission against farther damage.

The image beneath shows a typical transmission pressure level control solenoid. Note though that while all such solenoids are located within the transmission, the bodily advent, and exact location of these solenoids within the manual varies profoundly between applications and manufacturers.

Trans Pres Solenoid

What are the mutual causes of code P0776 ?

Some common causes of code P0776 could include the following-

  • Damaged, burnt, shorted, disconnected, or corroded wiring and /or connectors, both inside and outside of the transmission
  • Defective pressure control solenoid
  • Mechanical failure of some internal transmission components that can crusade blockages of hydraulic circuits in the valve torso and elsewhere in the manual
  • Failure of the pressure level pump
  • Dingy, contaminated, or degraded manual fluid
  • Low transmission fluid levels
  • Utilize of unsuitable, or incorrect types / grades of transmission fluid
  • Failed or failing PCM / TCM. Note that controller failure is rare, and the mistake must be sought elsewhere before any controller is replaced

What are the symptoms of lawmaking P0776 ?

Mutual symptoms of lawmaking P0776 could include the post-obit, only annotation that the severity of ane or more of the symptoms listed here can vary between applications-

  • Stored trouble lawmaking, and an illuminated warning light. Note that code P0776 tin can be accompanied by many other transmission related codes, some of which may be manufacturer specific
  • Gearshifts may be harsh, erratic, unpredictable
  • Depending on the nature of the problem, the transmission may not shift at all, or remain stuck in one gear
  • Manual may slip, or there may be varying degrees of hesitation before any gear is selected
  • In some cases, the engine may stall when the vehicle is slowed prior to stopping considering the torque converter lock-upwardly clutch may be fully engaged
  • Some applications may enter a failsafe, or limp mode that volition persist until the trouble is resolved
  • Depending on the nature of the problem, some transmissions may emit mechanical noises such as whining, grinding, rumbling, or even knocking/thudding sounds in some cases
  • On some applications, the transmission fluid may contain large or excessive amounts of metallic wear particles. Note that this is tin can be either a cause or a symptom of code P0776.

How do you troubleshoot lawmaking P0776 ?

SPECIAL NOTES: Properly diagnosing this code requires that the functioning of the pressure pump in the transmission be checked. Doing this requires the use of a dedicated pressure level gauge, but information technology should besides be noted that all transmissions have multiple pressure-testing points. Unlike functions can be tested /checked at different points, which makes of import to obtain a diagram of the hydraulic circuits in the transmission, likewise as a diagram that Conspicuously indicates the location and function of ALL pressure testing points on the transmission.

Since failure of the pressure pump can fix code P0776 on many applications, it is important to eliminate or confirm pump failure every bit the cause of the code on these applications, and the only manner to do that is to examination the force per unit area at the CORRECT pressure-testing point. Testing the force per unit area at whatever other point(south) will result in a misdiagnosis, wasted fourth dimension, and the almost certain unnecessary replacement of expensive parts and components, if non the entire manual. Stop OF SPECIAL NOTES.

NOTE: Every bit noted higher up, a dedicated pressure gauge with which to verify manual fluid pressure, every bit well every bit a diagram marking the location of all pressure testing points volition be most helpful in diagnosing this code.

Pace 1

Record all fault codes present, besides as all available freeze frame data. This information can exist of use should an intermittent fault be diagnosed afterward on.

Annotation: Pay particular attention to all and any additional codes that may be present- both agile and pending. Manual related codes that precede P0776 may have caused, or contributed to P0776 being ready, which means that these codes must be investigated and resolved in the gild in which they were stored, before a diagnosis of P0776 is attempted. Failure to exercise this will near certainly result in a misdiagnosis, wasted time, and the unnecessary replacement of parts and components.

Step ii

If the awarding does not have a "filled-for-life" transmission (refer to the SPECIAL NOTES at the acme of this guide), check the level of the transmission fluid every bit per the instructions provided in the manual as a first footstep, since low fluid levels is a major cause of this code.

Nonetheless, before topping off the fluid level (if required) be sure to inspect the fluid for signs of discoloration, degradation, contamination, or the presence of metal or other types of wear particles. Fluid that is night in color, has a tarry consistency, or has a burnt olfactory property can also crusade this code. Thus, if the transmission fluid is in a less-than-perfect state, supervene upon it with fluid of the right type and grade as per the instructions provided in the manual before continuing with the diagnostic process.

Alarm: If the transmission fluid contains an excessive amount of metal wear particles, do Not supercede the fluid, or meridian off the fluid level before finding, and correcting the trouble that is causing the wear particles. Excessive wear particles signal a serious mechanical problem or failure that can be the cause of one or more transmission related codes / problems, and in many cases, the transmission has to exist repaired or replaced before these codes can exist cleared.

Pace 3

If however, the transmission fluid is articulate and has a "fresh" smell, a low fluid level can only be the result of a fluid leak than in turn, tin can crusade all manner of manual related codes and problems. Thus, if the fluid level is low, find and repair all fluid leaks on the transmission earlier topping off the fluid level, or continuing with the diagnostic procedure.

Notation:  Be enlightened that many fluid leaks on automatic transmissions cannot be easily repaired on a DIY footing, since repairing some leaks requires the removal, and even partial disassembly of the transmission.

Step 4

Consult the manual, or the diagram that indicates all the pressure-testing points on the transmission, and attach the pressure gauge to the point that will allow you to obtain a reading of the pressure that the pump develops during normal operation in way that will not cause pressure level to be lost.

The object of this step is to see if the pressure pump works equally it should, so exist sure to follow the directions provided in the manual to do this correctly, and safely. Compare the obtained reading(due south) with those stated in the transmission. Commanded deviations will be stated in the manual so if this test yields values beneath the allowable deviations, the pressure pump is defective. In these cases, the wisest pick is to refer the vehicle to the dealer or other competent repair shop for professional assistance.

Step 5

If the manual fluid is in expert condition, the fluid is up to the "Total" mark, the pressure pump delivers the correct pressure and there are no fluid leaks present, refer to the manual to locate the relevant wiring harness. This harness ordinarily connects to a connector on the manual casing, simply use this time to also decide the part, and color-coding, of each wire in the connector.

One time the proper harness is identified, thoroughly inspect the full length of the harness (up to where information technology connects to the PCM or TCM for signs of damage, discoloration, corrosion, short circuits, or disconnected wires and or connectors. Make repairs as required if whatsoever of the above is found.

Clear all codes after repairs are complete, and operate the vehicle for at least one consummate drive bicycle to see if any codes render.

Step half-dozen

If the lawmaking persists, disconnect the manual harness from the PCM / TCM (to prevent damage to the controller(south) and perform resistance, continuity, and footing connectivity checks as per the instructions provided in the transmission on all circuits. Compare all obtained readings to the values stated in the transmission, and make repairs or replace wiring as required to ensure that all electrical values fall inside the ranges specified by the manufacturer.

Articulate all codes afterward repairs are complete, and operate the vehicle for at to the lowest degree one complete bulldoze bicycle to see if whatsoever codes return.

Pace 7

If the manual harness checks out, doubtable an electrical problem in the transmission, or a failure of the force per unit area control solenoid itself. To confirm this, perform resistance and continuity checks on the manual'southward internal wiring from the connector on the transmission. Compare all obtained readings to the values stated in the manual, and brand repairs or supercede wiring as required to ensure that all electrical values fall within the ranges specified by the manufacturer.

Footstep 8

If discrepancies are found, the only way to gain access to the wiring is by removing the transmission'southward oil pan. However, exercise NOT remove the oil pan on a transmission with a "lifetime" fill- refer to the SPECIAL NOTES at the top of this guide.

If it is possible to remove the oil pan, do so safely, by preventing fluid spills when the fluid is drained off. Remove the oil pan, and inspect it for the presence of excessive amounts of wear particles, or wear particles that seem abnormally large. These articles could exist metal, or from destroyed friction material, but regardless of what they are, they indicate a serious mechanical effect that must be resolved earlier the vehicle is put dorsum in service.

If however, the oil pan is articulate of wear particles, inspect the internal wiring. Bear in mind that due to the presence of metal in the transmission fluid, repairing the wiring is Not recommended. If damaged wiring is plant, the unabridged internal harness must be replaced to prevent possible short circuits acquired past metal in the manual fluid.

Pace 9

If the internal harness checks out, utilise the scanner to command the pressure command solenoid to cycle repeatedly to eliminate intermittent breaks in continuity as the cause of the lawmaking. The scanner will display the status of the solenoid- if the status does not modify, the solenoid is defective, and must exist replaced with an OEM part to ensure proper operation.

However, this is not e'er possible (or advisable) to do this on a DIY basis. If there is any doubt about your ability to remove and supplant the solenoid, refer the vehicle to the dealer or other competent repair shop for professional assistance to foreclose the possibility of causing impairment to manual components.

Step 10

In cases where the manual provides clear instructions on how to remove/replace the pressure control solenoid, follow the instructions exactly to avoid issues later on. Replace the transmission filter with an OEM replacement, and utilise a new gasket when replacing the oil pan to prevent leaks.

Refill the transmission with fluid of the correct blazon and grade as per the instructions provided in the transmission. Double check both the fluid level, and the transmission for leaks, clear all codes, and operate the vehicle normally before rescanning the arrangement to see if the code returns.

At this point, it is unlikely that the code will return, just if it does return, doubtable a defective PCM or TCM. If this is suspected, refer the vehicle for professional diagnosis, since most generic code readers cannot identify corrupted programming or other issues with command modules.

Codes Related to P0776

  • P0775 – Relates to "Pressure Command Solenoid B Malfunction"
  • P0777 – Relates to "Pressure Command Solenoid B Stuck On"
  • P0778 – Relates to "Pressure Control Solenoid B Electric"
  • P0779 – Relates to "Pressure Control Solenoid B Intermittent"