DQ400E fault codes
Documented fault codes for the DQ400E (6-speed hybrid DSG, factory 0DD). 20 codes are listed below, grouped by category, each marked by evidence level.
All DQ400E fault codes
Search and filter the documented codes for this family. Select a row to expand the detail.
20 codes shown. Click any row to expand the detail.
| Code | Description | Category | Status |
|---|---|---|---|
| 30097 | Transmission fluid pressure sensor — manufacturer event-memory code | Pressure sensor | Review |
DescriptionThe DQ400E transmission control unit stores 30097 when it detects the following condition: Transmission fluid pressure sensor — manufacturer event-memory code. The fault concerns a pressure sensor or pressure switch in the transmission. The control unit uses these signals for clutch and system pressure control, and stores the code when the signal is out of range, too low or implausible. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| P0218 | Transmission overtemperature condition | Hydraulic pressure | Review |
DescriptionThe DQ400E transmission control unit stores P0218 when it detects the following condition: Transmission overtemperature condition. The fault concerns the hydraulic supply of the mechatronic unit. The control unit compares the required system pressure with the measured pressure and stores the code when the pressure is too low, too high, builds up too slowly, or the pump runs outside its normal operating time. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| P0607 | Control module — implausible operation / hardware related | Internal control unit (TCU) | Review |
DescriptionThe DQ400E transmission control unit stores P0607 when it detects the following condition: Control module — implausible operation / hardware related. The fault originates in the transmission control electronics integrated into the mechatronic unit. The unit's self-diagnosis has detected an internal error, an implausible internal value or a software problem. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| P0715 | Input / turbine speed sensor A — circuit | Speed sensor | Review |
DescriptionThe DQ400E transmission control unit stores P0715 when it detects the following condition: Input / turbine speed sensor A — circuit. The fault concerns a speed signal. The control unit needs the input (clutch/turbine) and output shaft speeds to control shifts and clutch slip, and stores the code when a signal is missing, implausible or electrically faulty. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| P0731 | Gear 1 — incorrect ratio | Gear ratio / gear loss | Review |
DescriptionThe DQ400E transmission control unit stores P0731 when it detects the following condition: Gear 1 — incorrect ratio. This is a mechanical plausibility check: the control unit compares the input and output shaft speeds with the ratio expected for the selected gear. The code is stored when the calculated ratio does not match or a gear drops out unexpectedly. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| P074A | Gear 1 — incorrect ratio | Gear ratio / gear loss | Review |
DescriptionThe DQ400E transmission control unit stores P074A when it detects the following condition: Gear 1 — incorrect ratio. This is a mechanical plausibility check: the control unit compares the input and output shaft speeds with the ratio expected for the selected gear. The code is stored when the calculated ratio does not match or a gear drops out unexpectedly. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| P0842 | Transmission fluid pressure sensor — low signal | Pressure sensor | Review |
DescriptionThe DQ400E transmission control unit stores P0842 when it detects the following condition: Transmission fluid pressure sensor — low signal. The fault concerns a pressure sensor or pressure switch in the transmission. The control unit uses these signals for clutch and system pressure control, and stores the code when the signal is out of range, too low or implausible. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| P0867 | Transmission fluid pressure — low / implausible | Hydraulic pressure | Review |
DescriptionThe DQ400E transmission control unit stores P0867 when it detects the following condition: Transmission fluid pressure — low / implausible. The fault concerns the hydraulic supply of the mechatronic unit. The control unit compares the required system pressure with the measured pressure and stores the code when the pressure is too low, too high, builds up too slowly, or the pump runs outside its normal operating time. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| P0962 | Pressure control valve 1 — low control current | Valve / solenoid electrical | Review |
DescriptionThe DQ400E transmission control unit stores P0962 when it detects the following condition: Pressure control valve 1 — low control current. The fault is electrical: the control unit monitors the current and resistance of each solenoid and pressure control valve, and stores the code when it detects an open circuit, a short circuit or a control current outside the expected range. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| P0966 | Pressure control valve 2 — low control current | Valve / solenoid electrical | Review |
DescriptionThe DQ400E transmission control unit stores P0966 when it detects the following condition: Pressure control valve 2 — low control current. The fault is electrical: the control unit monitors the current and resistance of each solenoid and pressure control valve, and stores the code when it detects an open circuit, a short circuit or a control current outside the expected range. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| P172A | Hydraulic pressure — too high | Hydraulic pressure | Review |
DescriptionThe DQ400E transmission control unit stores P172A when it detects the following condition: Hydraulic pressure — too high. The fault concerns the hydraulic supply of the mechatronic unit. The control unit compares the required system pressure with the measured pressure and stores the code when the pressure is too low, too high, builds up too slowly, or the pump runs outside its normal operating time. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| P172B | Hydraulic pressure — too low | Hydraulic pressure | Review |
DescriptionThe DQ400E transmission control unit stores P172B when it detects the following condition: Hydraulic pressure — too low. The fault concerns the hydraulic supply of the mechatronic unit. The control unit compares the required system pressure with the measured pressure and stores the code when the pressure is too low, too high, builds up too slowly, or the pump runs outside its normal operating time. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| P1735 | Clutch 1 position sensor — electrical fault | Clutch faults | Review |
DescriptionThe DQ400E transmission control unit stores P1735 when it detects the following condition: Clutch 1 position sensor — electrical fault. The fault concerns clutch control: engagement, adaptation, torque limitation or clutch temperature. The control unit compares the commanded clutch position or pressure with the measured value and stores the code when the difference or the adapted value leaves the permitted range. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| P1736 | Clutch 2 position sensor — electrical fault | Clutch faults | Review |
DescriptionThe DQ400E transmission control unit stores P1736 when it detects the following condition: Clutch 2 position sensor — electrical fault. The fault concerns clutch control: engagement, adaptation, torque limitation or clutch temperature. The control unit compares the commanded clutch position or pressure with the measured value and stores the code when the difference or the adapted value leaves the permitted range. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| P179C | Main pressure valve — electrical malfunction | Valve / solenoid electrical | Review |
DescriptionThe DQ400E transmission control unit stores P179C when it detects the following condition: Main pressure valve — electrical malfunction. The fault is electrical: the control unit monitors the current and resistance of each solenoid and pressure control valve, and stores the code when it detects an open circuit, a short circuit or a control current outside the expected range. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| P17BF | Hydraulic pump system overload protection | Hydraulic pressure | Review |
DescriptionThe DQ400E transmission control unit stores P17BF when it detects the following condition: Hydraulic pump system overload protection. The fault concerns the hydraulic supply of the mechatronic unit. The control unit compares the required system pressure with the measured pressure and stores the code when the pressure is too low, too high, builds up too slowly, or the pump runs outside its normal operating time. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| P189C | Function restriction — insufficient pressure build-up | Hydraulic pressure | Review |
DescriptionThe DQ400E transmission control unit stores P189C when it detects the following condition: Function restriction — insufficient pressure build-up. The fault concerns the hydraulic supply of the mechatronic unit. The control unit compares the required system pressure with the measured pressure and stores the code when the pressure is too low, too high, builds up too slowly, or the pump runs outside its normal operating time. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| P2711 | Unexpected mechanical gear disengagement | Gear ratio / gear loss | Review |
DescriptionThe DQ400E transmission control unit stores P2711 when it detects the following condition: Unexpected mechanical gear disengagement. This is a mechanical plausibility check: the control unit compares the input and output shaft speeds with the ratio expected for the selected gear. The code is stored when the calculated ratio does not match or a gear drops out unexpectedly. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| P2884 | Engine disconnect clutch K0 — stuck open | Clutch faults | Review |
DescriptionThe DQ400E transmission control unit stores P2884 when it detects the following condition: Engine disconnect clutch K0 — stuck open. The fault concerns clutch control: engagement, adaptation, torque limitation or clutch temperature. The control unit compares the commanded clutch position or pressure with the measured value and stores the code when the difference or the adapted value leaves the permitted range. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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| U0101 | Lost communication with TCM | Communication | Review |
DescriptionThe DQ400E transmission control unit stores U0101 when it detects the following condition: Lost communication with TCM. The fault concerns data communication between the transmission control unit and other control units on the powertrain CAN bus. The code is stored when messages are missing or corrupted, or the bus hardware reports an error. A stored code does not by itself prove that a part has failed. Before replacing anything, check the live data, wiring, connectors, power supply and fluid condition, and confirm the fault on the vehicle. Symptoms
Possible causes
This code is documented but not independently confirmed. Confirm it against the specific vehicle before ordering any part.
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DQ400E fault-code categories
Codes are grouped by the system or component they relate to. Counts show how many codes fall into each category.
Hydraulic pressure (6)
The fault concerns the hydraulic supply of the mechatronic unit. The control unit compares the required system pressure with the measured pressure and stores the code when the pressure is too low, too high, builds up too slowly, or the pump runs outside its normal operating time.
Gear ratio / gear loss (3)
This is a mechanical plausibility check: the control unit compares the input and output shaft speeds with the ratio expected for the selected gear. The code is stored when the calculated ratio does not match or a gear drops out unexpectedly.
Valve / solenoid electrical (3)
The fault is electrical: the control unit monitors the current and resistance of each solenoid and pressure control valve, and stores the code when it detects an open circuit, a short circuit or a control current outside the expected range.
Clutch faults (3)
The fault concerns clutch control: engagement, adaptation, torque limitation or clutch temperature. The control unit compares the commanded clutch position or pressure with the measured value and stores the code when the difference or the adapted value leaves the permitted range.
Pressure sensor (2)
The fault concerns a pressure sensor or pressure switch in the transmission. The control unit uses these signals for clutch and system pressure control, and stores the code when the signal is out of range, too low or implausible.
Internal control unit (TCU) (1)
The fault originates in the transmission control electronics integrated into the mechatronic unit. The unit's self-diagnosis has detected an internal error, an implausible internal value or a software problem.
Speed sensor (1)
The fault concerns a speed signal. The control unit needs the input (clutch/turbine) and output shaft speeds to control shifts and clutch slip, and stores the code when a signal is missing, implausible or electrically faulty.
Communication (1)
The fault concerns data communication between the transmission control unit and other control units on the powertrain CAN bus. The code is stored when messages are missing or corrupted, or the bus hardware reports an error.
Related pages for the DQ400E
DQ400E repair
Symptoms, mechatronic issues and what repair involves for this family.
DQ400E mechatronics
Replacement mechatronic unit and exchange options for this family.
DQ400E parts
Selected parts most often involved in repair for this family.
Full fault-code database
All documented codes across every covered family.
DQ400E fault-code questions
How many fault codes are documented for the DQ400E?
The number shown on this page reflects the codes currently documented for the DQ400E in our reference. The database is extended as further documentation is confirmed.
Are DQ400E codes the same as codes on other DSG families?
Some codes overlap in format, but the DQ400E has its own hydraulic and clutch design, so the meaning and the likely cause can differ from other families. Always read a code in the context of the family.
Can you supply the part indicated by a DQ400E code?
We supply mechatronic assemblies and selected parts for the DQ400E. Send us the code and the vehicle details and we will confirm the correct unit or part by email.
Have a DQ400E fault code?
Send us the code and the vehicle details and we will confirm the correct DQ400E unit or part by email.