0DR mechatronic replacement unit
The 0DR / AL550 is a Automatic transmission (Tiptronic), factory code 0DR (AL550). Its mechatronic unit combines the valve body and the transmission control electronics.
This page covers the typical symptoms, control faults, fault codes and the replacement units available for the 0DR / AL550.
What the 0DR mechatronic does
This transmission uses a torque converter and planetary gear sets. The mechatronic unit selects the gears by controlling the pressure on the internal clutches and brakes.
Typical faults involve the solenoids, the pressure regulation, the speed sensors and the control electronics.
Replacement units are identified by the OEM part number. Always compare the number on your unit before ordering.
| Transmission family | 0DR (Automatic transmission (Tiptronic)) |
|---|---|
| Also known as | 0DR (AL550) |
| Clutch type | Torque converter |
| Gears | forward |
| Factory code | 0DR (AL550) |
Contents of the 0DR mechatronic assembly
The mechatronic assembly combines the hydraulic control unit and the electronic control unit in one housing. A replacement unit is supplied complete, ready to be fitted and adapted to the vehicle.
Hydraulic control unit
Valve body, solenoids and the pressure regulation that operate the clutches and control elements.
Electronic control unit
The transmission control unit and its sensors, integrated with the hydraulic side in one assembly.
Actuators and sensors
The solenoids, speed sensors and position sensors that let the control unit operate and monitor the transmission.
Housing and connector
The machined housing and the electrical connector through which the unit communicates with the vehicle.
Two ways to source the 0DR unit
Both options are agreed manually by email. There is no automated core deposit and no online payment.
- Replacement unit. You receive a mechatronic assembly and keep your original unit. The simplest option when the original is not serviceable or not required back.
- Exchange unit. You receive a unit and return your original. Exchange is agreed by email and is marked on the quotation request form.
- Fitment and adaptation. The replacement unit is adapted to the vehicle after fitting, which requires a suitable diagnostic tool. This is confirmed in the quotation reply.
0DR fault codes and repair information
The fault codes and repair pages for this family help confirm which unit is required before you order.
| Code | Description | Category | Status |
|---|---|---|---|
| P0700 | Transmission control system — malfunction (MIL request) | Transmission control | Review |
DescriptionThe 0DR 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 0DR 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 0DR 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 0DR 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 0DR 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 0DR 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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| P0731 | Gear 1 — incorrect ratio | Gear ratio / gear loss | Review |
DescriptionThe 0DR 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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| P0732 | Gear 2 — incorrect ratio | Gear ratio / gear loss | Review |
DescriptionThe 0DR transmission control unit stores P0732 when it detects the following condition: Gear 2 — 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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| P0733 | Gear 3 — incorrect ratio | Gear ratio / gear loss | Review |
DescriptionThe 0DR transmission control unit stores P0733 when it detects the following condition: Gear 3 — 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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| P0734 | Gear 4 — incorrect ratio | Gear ratio / gear loss | Review |
DescriptionThe 0DR transmission control unit stores P0734 when it detects the following condition: Gear 4 — 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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| P0735 | Gear 5 — incorrect ratio | Gear ratio / gear loss | Review |
DescriptionThe 0DR transmission control unit stores P0735 when it detects the following condition: Gear 5 — 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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| P0746 | Pressure control solenoid A — performance or stuck off | Valve / solenoid electrical | Review |
DescriptionThe 0DR 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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| P0750 | Shift solenoid A — malfunction | Valve / solenoid electrical | Review |
DescriptionThe 0DR transmission control unit stores P0750 when it detects the following condition: Shift solenoid A — 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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| P0755 | Shift solenoid B — malfunction | Valve / solenoid electrical | Review |
DescriptionThe 0DR transmission control unit stores P0755 when it detects the following condition: Shift solenoid B — 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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| P0760 | Shift solenoid C — malfunction | Valve / solenoid electrical | Review |
DescriptionThe 0DR transmission control unit stores P0760 when it detects the following condition: Shift solenoid C — 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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| P0841 | Transmission fluid pressure sensor/switch A — range/performance | Pressure sensor | Review |
DescriptionThe 0DR 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 0DR 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 0DR 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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0DR mechatronic unit
Prices are confirmed per request, because the correct unit depends on the transmission generation and the vehicle.
0DR / AL550 mechatronic unit — 0260550134
Refurbished mechatronic unit for the 0DR / AL550 (Automatic transmission (Tiptronic)), OEM part number 0260550134 (0260550134). Supplied as a complete assembly with the integrated control electronics.
0DR mechatronic questions
Is the 0DR mechatronic supplied with the electronics?
Yes. The replacement assembly combines the hydraulic control unit and the electronic control unit in one housing, supplied complete.
How does exchange work for the 0DR?
Exchange is agreed manually by email. You mark the exchange checkbox on the quotation request form and we confirm the terms in the reply. No core deposit is taken online.
Does the 0DR unit need coding after fitting?
The replacement unit is adapted to the vehicle after fitting, which requires a suitable diagnostic tool. This is confirmed in the quotation reply.
Send us your 0DR details
Tell us the vehicle, the part number and whether you want a replacement or exchange unit, and we will confirm the correct 0DR assembly by email.