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DL501 fault codes

Owner guides · Fault codes

Transmission diagnostics in a workshop, illustration — 59 fault-code entriesSearch by code or symptomVehicle-specific diagnostics

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DL501 fault codes

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Code descriptions help explain the diagnostic process. Interpretation depends on the full fault text, suffix, reporting controller and software version. The same base code can refer to different situations. This is not a parts-replacement instruction or a complete list for every version.

Fault codes

P0218Maximum transmission oil temperature exceeded

What is checked?: Temperature readings are compared with actual operating conditions. Sensor operation, fluid and cooling are checked before deciding on a repair.

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P0501Vehicle speed sensor A: range/performance

Code details: 8098
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

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P060AInternal control module monitoring processor malfunction

Code details: 8126 / 8345
What is checked?: The complete fault report and freeze-frame conditions are reviewed. The repair is planned from measurements and findings on the vehicle.

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P06AAInternal temperature sensor 2: temperature too high

What is checked?: Temperature readings are compared with actual operating conditions. Sensor operation, fluid and cooling are checked before deciding on a repair.

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P0700Transmission control system malfunction

Code details: 20196
What is checked?: The complete fault report and freeze-frame conditions are reviewed. The repair is planned from measurements and findings on the vehicle.

Link to this entry

P0715Input speed sensor A circuit fault

Code details: 8094 / 8103 / 18161
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P0716Input speed sensor A circuit: range/performance

Code details: 8096 / 8101 / 18153 / 20738
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P0726Implausible engine speed signal

Code details: 7980
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P0897Transmission fluid deterioration

What is checked?: The complete fault report and freeze-frame conditions are reviewed. The repair is planned from measurements and findings on the vehicle.

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P1624Malfunction indicator request; also read transmission fault memory

Code details: 10577
What is checked?: The complete fault report and freeze-frame conditions are reviewed. The repair is planned from measurements and findings on the vehicle.
Interpretation: This code may be reported by a controller other than the transmission. Check the reporting controller in the full scan.

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P171FTransmission input speed sensor 2: implausible signal

Code details: 8097 / 8102 / 18154
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

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P1724Immobilizer signal short to ground

What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P173ESub-transmission 1, valve 1: electrical fault

Code details: 8023
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P173FSub-transmission 1, valve 2: electrical fault

Code details: 8025
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P1740Clutch temperature monitoring

Code details: 8031 / 18148 / P1740 / 005952
What is checked?: Temperature readings are compared with actual operating conditions. Sensor operation, fluid and cooling are checked before deciding on a repair.

Link to this entry

P1741Clutch pressure adaptation limit reached

Code details: 18770
What is checked?: Requested and actual pressure are compared, with checks of fluid supply, pump operation and possible leakage. Temperature and load when the fault occurs help narrow down the cause.

Link to this entry

P174ASub-transmission 1, valve 3: electrical fault

Code details: 8939
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P174BSub-transmission 1, valve 4: electrical fault

Code details: 8027
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P174CValve electrical fault: verify the valve and sub-transmission from the vehicle's full fault text

Code details: 8026
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P174DSub-transmission 2, valve 2: electrical fault

Code details: 8024
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P174ESub-transmission 2, valve 3: electrical fault

Code details: 8940
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P174FSub-transmission 2, valve 4: electrical fault

Code details: 8028
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P1758Terminal 15 ignition-switched supply interrupted

Code details: 8464
What is checked?: Battery condition, charging, power supplies, grounds and connectors are checked under load. The code alone does not establish a control-module fault.

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P176AGear selector 1 cannot be regulated

Code details: 8093
What is checked?: Requested and actual gear, position signals and speed readings are compared. Oil pressure and mechanical operation are also checked under the conditions that trigger the fault.

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P176BGear selector 2 cannot be regulated

Code details: 8090
What is checked?: Requested and actual gear, position signals and speed readings are compared. Oil pressure and mechanical operation are also checked under the conditions that trigger the fault.

Link to this entry

P176CGear selector 3 cannot be regulated

Code details: 8092
What is checked?: Requested and actual gear, position signals and speed readings are compared. Oil pressure and mechanical operation are also checked under the conditions that trigger the fault.

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P176DGear selector 4 cannot be regulated

Code details: 8091
What is checked?: Requested and actual gear, position signals and speed readings are compared. Oil pressure and mechanical operation are also checked under the conditions that trigger the fault.

Link to this entry

P179CMain pressure valve electrical fault

Code details: 8029
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P179DCooling oil valve electrical fault

Code details: 8030
What is checked?: Temperature readings are compared with actual operating conditions. Sensor operation, fluid and cooling are checked before deciding on a repair.

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P179EDrive range sensor electrical fault

Code details: 8050 / 8051 / 8052 / 8053 / 17595 / 17596 / 17597 / 17598 / 17602
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P179FDrive range sensor malfunction

Code details: 8054 / 8055 / 8056 / 8057 / 17599 / 17600 / 17601
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P17CFClutch 1: excessive slip

Code details: 8958
What is checked?: Clutch control, shaft speeds and hydraulic operation are compared. Slip or judder may relate to wear, pressure or control; the cause is investigated before parts are replaced.

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P17D0Clutch 2: excessive slip

Code details: 18446
What is checked?: Clutch control, shaft speeds and hydraulic operation are compared. Slip or judder may relate to wear, pressure or control; the cause is investigated before parts are replaced.

Link to this entry

P17D0Clutch 2: excessive slip

Code details: 8963
What is checked?: Clutch control, shaft speeds and hydraulic operation are compared. Slip or judder may relate to wear, pressure or control; the cause is investigated before parts are replaced.

Link to this entry

P17D4Sub-transmission 1, valve 3: mechanical malfunction

Code details: 18765
What is checked?: The complete fault report and freeze-frame conditions are reviewed. The repair is planned from measurements and findings on the vehicle.

Link to this entry

P17D5Sub-transmission 2, valve 3: mechanical malfunction

Code details: 18766
What is checked?: The complete fault report and freeze-frame conditions are reviewed. The repair is planned from measurements and findings on the vehicle.

Link to this entry

P17D6Clutch 1: pressure too high

Code details: 18443
What is checked?: Requested and actual pressure are compared, with checks of fluid supply, pump operation and possible leakage. Temperature and load when the fault occurs help narrow down the cause.

Link to this entry

P17D7Clutch 2: pressure too high

Code details: 18445
What is checked?: Requested and actual pressure are compared, with checks of fluid supply, pump operation and possible leakage. Temperature and load when the fault occurs help narrow down the cause.

Link to this entry

P17D8Torque limited due to clutch temperature

Code details: 8040
What is checked?: Temperature readings are compared with actual operating conditions. Sensor operation, fluid and cooling are checked before deciding on a repair.

Link to this entry

P17E0Gear selector 1: mechanical malfunction

Code details: 9711
What is checked?: The complete fault report and freeze-frame conditions are reviewed. The repair is planned from measurements and findings on the vehicle.

Link to this entry

P17E1Gear selector 2: mechanical malfunction

Code details: 9708
What is checked?: The complete fault report and freeze-frame conditions are reviewed. The repair is planned from measurements and findings on the vehicle.

Link to this entry

P17E1Gear selector 2: mechanical malfunction

Code details: P17E100 / 9473
What is checked?: The complete fault report and freeze-frame conditions are reviewed. The repair is planned from measurements and findings on the vehicle.

Link to this entry

P187BGear actuator 2: engagement unsuccessful

Code details: 18011
What is checked?: The complete fault report and freeze-frame conditions are reviewed. The repair is planned from measurements and findings on the vehicle.

Link to this entry

P1890Tiptronic signal wire electrical fault

Code details: 7969
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P1892Selector lever position monitoring malfunction

Code details: 7967
What is checked?: Requested and actual gear, position signals and speed readings are compared. Oil pressure and mechanical operation are also checked under the conditions that trigger the fault.

Link to this entry

P1893Selector lever gear display signal wire electrical fault

Code details: 7965
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P1894Selector lever gear display signal implausible

Code details: 7966
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P2159Vehicle speed sensor B: range/performance

Code details: 8099
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P2753Transmission oil cooling control circuit open

Code details: P275300
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P2755Transmission oil cooling control circuit high

Code details: P275500
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P2765Input speed sensor B circuit fault

Code details: 8095 / 8104
What is checked?: The named component’s signal, wiring, connectors and supply are checked. A sensor or valve code alone does not mean the entire mechatronics unit needs replacing.

Link to this entry

P2789Clutch adaptation at limit

Code details: 18772
What is checked?: The software version, commissioning prerequisites and other faults are checked. Basic settings cannot repair a worn component, leakage or an electrical fault.

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P284AShift fork 2 stuck

Code details: 18051
What is checked?: Requested and actual gear, position signals and speed readings are compared. Oil pressure and mechanical operation are also checked under the conditions that trigger the fault.

Link to this entry

P2850Shift fork 4 moves without a command

Code details: 17591
What is checked?: Requested and actual gear, position signals and speed readings are compared. Oil pressure and mechanical operation are also checked under the conditions that trigger the fault.

Link to this entry

U0100Lost communication with engine control module

Code details: 18147 / 8008
What is checked?: The full vehicle scan, module power supplies and communication are checked. A transmission warning may also originate in another system.

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U0101Lost communication with transmission control module

Code details: 4718
What is checked?: The full vehicle scan, module power supplies and communication are checked. A transmission warning may also originate in another system.
Interpretation: This code may be reported by a controller other than the transmission. Check the reporting controller in the full scan.

Link to this entry

U0146No communication with diagnostic gateway

Code details: 8001
What is checked?: The full vehicle scan, module power supplies and communication are checked. A transmission warning may also originate in another system.

Link to this entry

U0212Lost communication with steering column control module

Code details: 8015
What is checked?: The full vehicle scan, module power supplies and communication are checked. A transmission warning may also originate in another system.

Link to this entry

U0401Implausible data received from engine control module

Code details: 8448
What is checked?: The full vehicle scan, module power supplies and communication are checked. A transmission warning may also originate in another system.

Link to this entry

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