01J fault codes
Documented fault codes for the 01J (Multitronic CVT, factory 01J). 10 codes are listed below, grouped by category, each marked by evidence level.
All 01J fault codes
Search and filter the documented codes for this family. Select a row to expand the detail.
10 codes shown. Click any row to expand the detail.
| Code | Description | Category | Status |
|---|---|---|---|
| P0700 | Transmission control system — malfunction (MIL request) | Transmission control | Review |
DescriptionThe 01J transmission control unit stores P0700 when it detects the following condition: Transmission control system — malfunction (MIL request). A general transmission control fault: the control unit has detected a malfunction in the transmission system that is not tied to one specific component. Codes stored at the same time usually point to the actual cause. 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 01J 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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| P0716 | Input/turbine speed sensor A — range/performance | Speed sensor | Review |
DescriptionThe 01J transmission control unit stores P0716 when it detects the following condition: Input/turbine speed sensor A — range/performance. 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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| P0720 | Output speed sensor — circuit | Speed sensor | Review |
DescriptionThe 01J transmission control unit stores P0720 when it detects the following condition: Output speed sensor — 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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| P0721 | Output speed sensor — range/performance | Speed sensor | Review |
DescriptionThe 01J transmission control unit stores P0721 when it detects the following condition: Output speed sensor — range/performance. 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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| P0730 | Incorrect gear ratio | Gear ratio / gear loss | Review |
DescriptionThe 01J transmission control unit stores P0730 when it detects the following condition: Incorrect gear 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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| P0746 | Pressure control solenoid A — performance or stuck off | Valve / solenoid electrical | Review |
DescriptionThe 01J transmission control unit stores P0746 when it detects the following condition: Pressure control solenoid A — performance or stuck off. 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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| P0841 | Transmission fluid pressure sensor/switch A — range/performance | Pressure sensor | Review |
DescriptionThe 01J transmission control unit stores P0841 when it detects the following condition: Transmission fluid pressure sensor/switch A — range/performance. 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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| P0868 | Transmission fluid pressure low | Hydraulic pressure | Review |
DescriptionThe 01J transmission control unit stores P0868 when it detects the following condition: Transmission fluid pressure 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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| U0101 | Lost communication with transmission control module (TCM) | Communication | Review |
DescriptionThe 01J transmission control unit stores U0101 when it detects the following condition: Lost communication with transmission control module (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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01J fault-code categories
Codes are grouped by the system or component they relate to. Counts show how many codes fall into each category.
Speed sensor (4)
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.
Transmission control (1)
A general transmission control fault: the control unit has detected a malfunction in the transmission system that is not tied to one specific component. Codes stored at the same time usually point to the actual cause.
Gear ratio / gear loss (1)
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 (1)
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.
Pressure sensor (1)
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.
Hydraulic pressure (1)
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.
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.
01J fault-code questions
How many fault codes are documented for the 01J?
The number shown on this page reflects the codes currently documented for the 01J in our reference. The database is extended as further documentation is confirmed.
Are 01J codes the same as on other transmissions?
Generic OBD-II codes have the same wording on every transmission, but the cause depends on the design of the 01J. Always read a code in the context of the transmission type.
Can you supply the part indicated by a 01J code?
We supply mechatronic assemblies and selected parts for the 01J. Send us the code and the vehicle details and we will confirm the correct unit or part by email.
Have a 01J fault code?
Send us the code and the vehicle details and we will confirm the correct 01J unit or part by email.