The P0944 DTC is often used on VW and Chrysler Corp. vehicles when the transmission pump stops making hydraulic pressure. This is a serious OBD2 code, and should be addressed immediately.
Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.
What Transmission Do I Have?
How Serious is the Code?
The P0944 diagnostic trouble code is actually one of the most severe transmission OBDII trouble codes that you can have. If the transmission loses hydraulic pressure, it will literally not be able to function. When this happens, severe internal damage will occur.
Symptoms
Symptoms of a P0944 include:
- Delayed shifts
- Transmission refuses to shift
Causes
- Dirty or low transmission fluid
- Blocked or loose transmission cooler lines/filter
- Faulty transmission pump
- Internal hydraulic passage blockage
- Stuck transmission pressure regulator valve
How to Diagnose the Code?
The best way to diagnose a P0944 OBDII trouble code, is to perform a transmission line pressure test. This will tell the technician whether or not the transmission pump is creating enough hydraulic pressure.
What Repairs Will Fix P0944?
- Change transmission fluid
- Flush transmission
- Replace transmission cooler lines filter
- Replace transmission pump
- Replace transmission regulator valve
- Replace, rebuild or install remanufactured transmission
Related Codes
N/A
Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.
What Transmission Do I Have?
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разъём продувал прочищал ли ?
проверяй электрику.
Все разьемы уже можно как украшения использовать. Блестят лучше чем новые
масло в коробке давно менял? я бы гидроплиту промыл, может частичками износа забились каналы просто, вот и не хватает давления переключить. Вынимаешь щуп из коробки, вытираешь, измеряешь уровень масла при заглушенном двигателе, заводишь авто и замеряешь ещё раз. Если уровень не меняется, то насос не работает.
Масло новое залил. На горячую машину и коробку уровень масла как положен. На холодную его больше. Вроде так.
Symptom:
P0944-LOSS OF PRIME
When Monitored and Set Condition:
P0944-LOSS OF PRIME
When Monitored:
If the transmission is slipping in any forward gear and the pressure
switches are not indicating pressure, a loss of prime test is run.
Set Condition:
If the Transmission begins to slip in a forward gear and the pressure
switch(s) that should be closed are open, a loss of prime test begins. Available elements are
turned on by the PCM to see if pump prime exists. The DTC sets if no pressure switches
respond.
POSSIBLE CAUSES
SHIFT LEVER POSITION
PLUGGED TRANSMISSION OIL FILTER
TRANSMISSION OIL PUMP
INTERMITTENT WIRING AND CONNECTORS
TEST
ACTION
APPLICABILITY
1
NOTE: Low fluid level can be the cause of many transmission problems. If
the fluid level is low locate and repair the leak then check and adjust the
fluid level per the Service Information.
NOTE: Always perform diagnostics with a fully charged battery to avoid
false symptoms.
With the DRBIII
t, read Engine DTC’s. Check and repair all Engine DTC’s prior to
performing any transmission symptom diagnostics.
With the DRBIII
t, read Transmission DTC’s. Record all DTC’s and 1 Trip Failures.
NOTE: Diagnose 1 Trip Failures as a fully matured DTC.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test
for P0706 Check Shifter Signal.
For Gear Ratio DTC’s, check and record all CVI’s.
Most DTC’s set on start up but some must be set by driving the vehicle such that all
diagnostic monitors have run.
NOTE: Verify flash level of Powertrain Control Module. Some problems are
corrected by software upgrades to the Transmission and Engine software.
NOTE: Check for applicable TSB’s related to the problem.
Perform this procedure prior to Symptom diagnosis.
All
Continue
Go To
2
272
TRANSMISSION — NGC
TEST
ACTION
APPLICABILITY
2
Place the gear selector in park.
Start the engine.
NOTE: The TRANS TEMP DEG must be at least 43° C or 110° F before
performing the following steps.
The Transmission must be at operating temperature prior to checking pressure. A
cold Transmission will give higher readings.
Place the Transmission in Reverse.
With the DRBIII
t, observe the Transmission Pressure Switch states.
Are any of the Pressure Switches closed?
All
Yes
→ Go To 3
No
→ Go To 5
3
The conditions necessary to set this DTC are not present at this time.
Test drive the vehicle. Allow the Transmission to shift through all gears and ranges.
Did you experience a delayed engagement and/or a no drive condition?
All
Yes
→ Go To 5
No
→ Go To 4
4
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this
circuit.
Wiggle the wiring while checking for shorted and open circuits.
With the DRBIII
t, check the EATX EVENT DATA to help identify the conditions in
which the DTC was set.
Were there any problems found?
All
Yes
→ Repair as necessary.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST —
VER 1.
No
→ Test Complete.
5
With the DRBIII
t, perform a Shift Lever Position test. Follow the instructions on the
DRBIII
t.
Did the Shift Lever Position Test pass?
All
Yes
→ Go To 6
No
→ Refer to symptom list and perform test for DTC P0706.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST —
VER 1.
6
Remove and inspect the Transmission Oil Pan and Transmission Oil Filter per the
Service Information.
Does the Transmission Oil Pan contain excessive debris and/or is the Oil Filter
plugged?
All
Yes
→ Repair the cause of the plugged Transmission Oil Filter. Refer to
the Service Information for the proper repair procedure.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST —
VER 1.
No
→ Go To 7
273
TRANSMISSION — NGC
P0944-LOSS OF PRIME —
Continued
TEST
ACTION
APPLICABILITY
7
If there are no possible causes remaining, view repair.
All
Repair
Replace the Transmission Oil Pump per the Service Information.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST —
VER 1.
274
TRANSMISSION — NGC
P0944-LOSS OF PRIME —
Continued
Symptom:
P0952-AUTOSTICK INPUT CIRCUIT LOW
When Monitored and Set Condition:
P0952-AUTOSTICK INPUT CIRCUIT LOW
When Monitored:
The AutoStick circuit is checked every .007 seconds, with the ignition
on, and in both AutoStick and non-AutoStick modes.
Set Condition:
If either the monitored upshift or downshift switch voltages are reported
closed in a non AutoStick mode or the monitored voltage drops below 0.3 volts.
POSSIBLE CAUSES
AUTOSTICK/OD OFF MUX INPUT CIRCUIT SHORT TO GROUND
AUTOSTICK SWITCH
POWERTRAIN CONTROL MODULE
INTERMITTENT WIRING AND CONNECTORS
TEST
ACTION
APPLICABILITY
1
NOTE: Low fluid level can be the cause of many transmission problems. If
the fluid level is low locate and repair the leak then check and adjust the
fluid level per the Service Information.
NOTE: Always perform diagnostics with a fully charged battery to avoid
false symptoms.
With the DRBIII
t, read Engine DTC’s. Check and repair all Engine DTC’s prior to
performing any transmission symptom diagnostics.
With the DRBIII
t, read Transmission DTC’s. Record all DTC’s and 1 Trip Failures.
NOTE: Diagnose 1 Trip Failures as a fully matured DTC.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test
for P0706 Check Shifter Signal.
For Gear Ratio DTC’s, check and record all CVI’s.
Most DTC’s set on start up but some must be set by driving the vehicle such that all
diagnostic monitors have run.
NOTE: Verify flash level of Powertrain Control Module. Some problems are
corrected by software upgrades to the Transmission and Engine software.
NOTE: Check for applicable TSB’s related to the problem.
Perform this procedure prior to Symptom diagnosis.
All
Continue
Go To
2
2
With the DRBIII
t, Check the STARTS SINCE SET counter for P0952.
Note: This counter only applies to the last DTC set.
Is the Starts Since Set counter set at 0?
All
Yes
→ Go To 3
No
→ Go To 6
275
TRANSMISSION — NGC
Страницы
Страницы
Принимая во внимание тот факт, что OBD2 ошибки работы электронных систем автомобиля не всегда на прямую указывают на неработающий элемент, а чаще дают всего лишь общую информацию о неисправности, мы пришли к следующему выводу:
В разных марках и моделях автомобилей одна и также ошибка может возникать как следствие неисправности абсолютно разных элементов.
Стало понятно, что просто необходим ресурс в котором можно найти не только общую информацию об OBD2 ошибке, а практические данные по конкретному автомобилю.
Опыт автоэлектриков показал, что если рассматривать определенную марка-модель автомобиля, то в подавляющем большинстве случаев причина возникновения какой либо ошибки одна и также.
Мы создаем, не без вашей помощи, справочник причинно-следственной связи возникновения той или иной OBD2 ошибки у конкретного автомобиля (марка и модель). Если на Ваш автомобиль не найдено описание (причинно-следственной связи) ошибки, то не стесняйтесь задавайте вопрос.
Если у вас есть опыт в устранении той или иной ошибки — делитесь опытом с другими пользователями. Так мы сможем сформировать полезный ресурс. По капле от каждого и всем будет полезно.
Возможно будет интересно:
Если ошибка указывает на неверные параметры (высокие или низкие значения) какого нибудь из датчиков или анализаторов, то вероятней всего этот элемент исправен, а проблему надо искать так сказать «выше по течению», в элементах работу которых анализирует датчик или зонд.
Если ошибка указывает на постоянно открытый или закрытый клапан, то тут надо подойти к решению вопроса с умом, а не менять бездумно этот элемент. Причин может быть несколько: клапан засорен, клапан заклинил, на клапан приходит неверный сигнал от других неисправных узлов.
Автомобили с каждым днем становятся все более сложными, но и более диагностируемыми. Наш форум создан для всех, от простых автолюбителей до профессиональных автоэлектриков.