Issues with the 0CJ gearbox

[Samantha_Jones83]

I will begin with some background information.

I just acquired a car from a colleague. Upon first acquiring the vehicle, he had issues with the gearbox, prompting him to consult a business named Milta, which ultimately necessitated a gearbox reconditioning. The invoice indicates a reconditioning of a 0CJ gearbox dated 22/01/2024, however it lacks a detailed breakdown of the finished work. The invoice amount was £3000.

To my knowledge, my buddy had no troubles after the completion of the reconditioning until about one month ago (28/8/24), when a gearbox breakdown notification occurred. He returned it to Milta and had the auxiliary gearbox pump changed at no cost, despite it being outside their six-month guarantee.

Currently, I am encountering issues; when driving home from work yesterday, a warning indicating a gearbox breakdown occurred, stating, “Gearbox malfunction you may continue to drive (limited function).” Approximately five seconds later, another notice appeared stating, “Gearbox malfunction; please halt the vehicle and select P.”
I halted the car and engaged the parking mechanism. Deactivated it and waited for many minutes. Reactivated the device, and the first warning reappeared stating, “Gearbox malfunction; you may continue to drive (limited function).” I was around 1 mile from home, allowing me to return, but I saw that the gear shifts seemed to be more prolonged than normal.
Upon arriving home, I used my OBD scanner to identify the diagnostic codes, which revealed four gearbox issues. I have now sent Milta an email including the codes that were generated for me.

They responded the next day, stating that the same four problems persisted as before the auxiliary gearbox pump was replaced. They have now indicated that a new TCU is required and have charged £1992, inclusive of VAT, installation and configuration.

It was undoubtedly surprising to see this pricing; my web search reveals a scarcity of retailers providing these TCUs.

Should I consult my local AUDI VW expert to get their opinion and maybe a more favourable quote?

I have contemplated the possibility of remapping it to see whether it is a software problem.

I would appreciate any insights and recommendations from anybody.

The automobile is a 2018 Audi A5 2.0L Quattro S-Line.

Thank you very much.

[jane_doe2023]

I regret to learn about your difficulties.
Perhaps you could demonstrate the flaws you identified.
We are currently merely speculating.

[Samantha_Jones83]

I will report the flaws.

ERROR 1

20802 - Auxiliary Transmission Fluid Pump Driver: Circuit Efficacy

Static image:

Priority Level: 2

Frequency of malfunctions: 2

Counter for unlearning: 255

Odometer reading: 118,186 kilometres

Date: September 18, 2024, 4:46:02 PM

Output speed of gearbox: 385.0 RPM

Engine torque: -24 Newton-meters

Engine revolutions per minute: 7140 RPM

Driving Position: D

Automatic Transmission Fluid temperature: 43 °C

Voltage at terminal 30: 14.6 V

Chosen gear: 4

Control module, operational status: Normal operation

Requesting functionality for the auxiliary gearbox pump: Activation impeded by mechanical malfunction

Auxiliary hydraulic pump for gearbox fluid, current: 0.0 A

Oil pressure reservoir, pressure: 24.4 bar

Clutch 1 pressure, current measurement: 0.0 bar

Clutch pressure 2, measured value: 4.5 bar

Clutch condition: Engaged for up-shifting

Requesting functionality for the auxiliary gearbox pump: Activation impeded by mechanical malfunction

ERROR 2

20799 - Electric/Auxiliary Transmission Fluid Pump "A": Elevated Motor Current

Static image:

Priority level: 2

Malfunction frequency counter: two

Counter for unlearning: 255

Odometer measurement: 118,186 kilometres

Date: September 18, 2024, 4:46:05 PM

Output speed of gearbox: 377.0 RPM

Engine torque: 80 Newton-meters

Engine revolutions per minute: 4952 RPM

Driving position: Drive

Automatic Transmission Fluid temperature: 43 °C

Voltage at terminal 30: 14.5 V

Chosen equipment: 5

Control module, operational status: Normal operation

Requesting functionality for the auxiliary gearbox pump: Activation not possible due to mechanical malfunction

Auxiliary hydraulic pump for gearbox fluid, current: 0.0 A

Oil pressure reservoir, pressure: 24.5 bar

Clutch 1 pressure, measured value: 6.8 bar

Clutch pressure 2, current value: 0.0 bar

Clutch condition: Engaged

Requesting functionality for the auxiliary gearbox pump: Activation not possible due to mechanical malfunction

ERROR 3

20797 - Auxiliary Transmission Fluid Pump: Motor Malfunction

Static image:

Priority Level: 2

Malfunction frequency count: 1

Unlearning counter: 255

Odometer measurement: 118,187 kilometres

Date: September 18, 2024, 4:46:29 PM

Output speed of gearbox: 286.0 RPM

Engine torque: -24 Newton-meters

Engine revolutions per minute: 7960 RPM

Driving mode: D

Automatic Transmission Fluid temperature: 43 °C

Voltage at terminal 30: 14.4 V

Chosen equipment: 2

Control module, operational status: Standard operation

Requesting functionality for the auxiliary gearbox pump: Verify accumulated pressure

Auxiliary hydraulic pump for gearbox fluid, current: 8.0 A

Oil pressure reservoir, pressure: 23.5 bar

Clutch 1 pressure, measured value: 4.5 bar

Clutch pressure 2, current value: 4.6 bar

Clutch condition: Engaged for up-shifting

Requesting functionality for the auxiliary gearbox pump: Verify accumulated pressure

ERROR 4

20757 - Auxiliary Transmission Fluid Pump Control Module: Insufficient Feedback Signal

Static image:

Priority Level: 2

Malfunction frequency counter: one

Counter for unlearning: 255

Odometer reading: 118,187 km

Date: September 18, 2024, 4:46:36 PM

Output speed of gearbox: 379.0 RPM

Engine torque: -28 Newton-meters

Engine revolutions per minute: 7076 RPM

Driving mode: D

Automatic Transmission Fluid temperature: 43 °C

Voltage at terminal 30: 14.3 V

Chosen equipment: 4

Control module, operational status: Standard operation

Requesting functionality for the auxiliary gearbox pump: Verify accumulated pressure

Auxiliary hydraulic pump for gearbox fluid, current: 10.0 A

Oil pressure reservoir, pressure: 20.9 bar

Clutch 1 pressure, current value: 0.0 bar

Clutch pressure 2, current value: 7.0 bar

Clutch condition: Engaged

Requesting functionality for the auxiliary gearbox pump: Verify accumulated pressure

[AudiFan2021]

I would not like to return and relinquish that amount of money without obtaining a second opinion. They seem neither trustworthy nor earnest.

[Samantha_Jones83]

The business in issue is regarded as the UK's expert in automatic gearboxes; yet, a price like that inevitably prompts caution. I want to contact my local Audi professional to enquire about their recommendations. They may lack the necessary expertise or equipment, but it is advisable to enquire before spending roughly $2000.

[AudiFan2021]

I agree; obtaining a second opinion is very worthwhile. Based on your description, they do not seem to be a credible expert, my apologies.