Skoda Octavia 2010 facelift: erori G85 după instalare casetă direcție Gen 2

madalin2401 wrote:

Bună ziua, am probleme cu o Skoda Octavia facelift din 2010. Am instalat caseta de direcție Gen 2, am instalat un computer de volan cu un... G85 senzor, dar tot nu vede G85 senzor și tot am aceste ero...

Hello.

From your description, the problem is most likely not the G85 sensor itself, but one of these four issues:

1. wrong steering column control module / slip-ring variant (SCCM)
2. Gen2 rack not powered/coded correctly
3. ABS / Steering Assist still looking for G85 in the wrong place
4. basic settings were not completed after the swap

On the 2010 Octavia facelift this is very common, because that period is a transition between different PQ35 steering electronics families. Mixing parts that physically fit does not guarantee that module 03/44/16 will accept the G85.

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Direct answer

If the car “does not see” G85 after fitting a Gen2 steering rack and a steering column module with G85, then you should check in this order:

1. Check whether the steering column module actually supports G85
In address 16 - Steering Wheel Electronics, read:
- part number
- coding
- Advanced ID / Measuring Blocks

If the module identifies something like “Steering Angle Sensor: No”, ABS will never see G85, no matter how many calibrations you try.

This is one of the most common causes.

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2. Make sure module 44 is alive and correctly powered
In address 44 - Steering Assist:
- verify that the module communicates
- check for DTCs
- verify power supply

Some Gen2 racks require:
- KL30 permanent battery supply
- KL31 ground
- KL15 switched ignition +12 V

If Terminal 15 is missing, the rack may not initialize correctly and G85 adaptation may fail.

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3. Verify Gateway installation list
In address 19 - CAN Gateway:
- module 44 - Steering Assist must be present in the installation list
- module 16 - Steering Wheel Electronics must also be correctly visible
- there must be no “No Communication” fault for 44

If 44 is missing from Gateway or not communicating, ABS cannot complete the steering-angle logic.

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4. Check coding of ABS and Steering Assist
Depending on the exact rack/SCCM family, the vehicle may still be coded to expect the steering angle information from a different source.

You need to verify:
- 03 - ABS Brakes
- 44 - Steering Assist
- 16 - Steering Wheel Electronics

If the ABS or J500 steering assist is still coded for a different G85 source, you will keep getting faults even with good hardware.

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5. Perform basic settings only after the above is correct
If hardware, wiring, and coding are correct, then perform:
- G85 steering angle calibration
- steering limit stop learning
- clear faults
- short straight-line drive

If these are not done, common faults are:
- 00778 – Steering Angle Sensor G85
- 02546 – Steering limit stop not learned
- 03803 – No / incorrect basic setting or adaptation

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Detailed problem analysis

A. The biggest mistake in these retrofits: part compatibility
Your car is from a year where VAG used multiple combinations:
- different steering racks
- different SCCM / slip-ring families
- different ABS coding logic

So the first thing is not adaptation, but part-number compatibility.

Please check and compare the exact part numbers of:
- old steering rack
- installed Gen2 steering rack
- steering column electronics module
- slip ring / clock spring
- ABS module

If you mixed:
- older 1K0 family parts
with
- newer 5K0 family wiring/modules,

the car may communicate partially, but G85 will not be accepted correctly.

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B. The error 02546 is usually secondary
If you have fault 02546 – Steering limit stop not learned, this is often not the root cause.

It usually appears because:
- G85 is not recognized correctly
- basic settings were lost
- steering assist module was replaced
- steering geometry reference was not completed after repair

So do not focus only on 02546.

The more important question is:
- does module 16 show a valid G85?
- does module 44 accept it?
- does ABS see it?

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C. Check live data before any adaptation
Before calibration, look at live values.

With wheels straight and steering wheel centered:
- G85 angle should be approximately 0°
acceptable is roughly ±5°

If you see values near:
- +360°
- -360°

then the clock spring/slip ring is off-center by one turn.
In that case, adaptation may fail until the slip ring is centered mechanically.

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D. Power and CAN wiring are critical on Gen2 racks
Do not assume that because the rack bolts in, the electronics are correct.

Check:
- battery supply at rack
- ignition-switched supply
- grounds
- CAN High / CAN Low continuity

If module 44 is unstable or absent, first solve:
- fuse
- supply voltage
- ground drop
- CAN wiring

Only then move to coding/adaptation.

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Practical diagnostic sequence

Do this with VCDS or ODIS:

Step 1 – Full Auto-Scan
Scan all modules and save the report.

I need especially:
- 03 - ABS Brakes
- 16 - Steering Wheel Electronics
- 19 - CAN Gateway
- 44 - Steering Assist

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Step 2 – Verify module 16
In module 16, post:
- part number
- software version
- coding
- whether G85 is listed/supported

If module 16 does not explicitly support G85, replace it with the correct SCCM variant.

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Step 3 – Verify module 44
In module 44:
- check if communication exists
- read DTCs
- read measuring values for steering angle if available

If 44 is missing or not reachable, solve power/wiring first.

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Step 4 – Verify Gateway 19
In module 19:
- confirm module 44 is installed
- clear any gateway communication faults
- rescan

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Step 5 – Verify ABS 03 coding
The ABS must be coded consistently with the steering system configuration.

Important:
- save the original coding before changing anything
- do not copy coding from another car blindly

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Step 6 – Basic settings
Only after the above:

1. wheels straight
2. steering wheel centered
3. engine running
4. perform G85 basic setting
5. perform steering limit stop learning
6. clear DTCs
7. drive a short straight line at low speed

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What I need from you to give the exact fix

Please post:

1. complete Auto-Scan
2. exact DTCs from:
- 03
- 16
- 19
- 44
3. part number of:
- old rack
- new Gen2 rack
- steering column module
- slip ring
4. does module 44 communicate or not?
5. in module 16, does it show G85 present or not?

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Practical conclusion

At the moment, the most probable causes are:

- wrong SCCM variant that does not report G85
- missing KL15 power to the Gen2 steering rack
- module 44 / ABS still coded for a different steering-angle source
- G85 not calibrated, or slip ring not centered

So the repair path is:

compatibility check -> power/wiring check -> gateway/coding check -> calibration

Not the other way around.

If you send the Auto-Scan and the part numbers, I can tell you much more precisely whether the problem is:
- wrong module,
- wrong coding,
- missing power,
- or failed adaptation.

madalin2401 wrote:

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Initial assessment

Your attachment did not come through; it shows only

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, so I cannot see the actual fault codes or scan. Because of that, I cannot give you the exact coding bytes yet, but I can tell you the most likely root cause for this retrofit.

Direct answer

On this type of VAG electromechanical steering system, the problem is usually not a “bad G85 sensor”, but a configuration mismatch between:

- the steering rack / J500,
- the steering column electronics (J527 / module 16),
- ABS (module 03),
- and the adaptation setting that decides whether G85 is expected in the rack or in the column. (wiki.ross-tech.com)

The most important thing to check first is Address 44 - Steering Assist, Adaptation Channel 9. VW’s steering bulletin says:

- if Channel 9 exists, the system supports an internal rack G85;
- if Channel 9 is “not present”, the car expects G85 in the steering column;
- if a rack with internal G85 is installed in a car originally built with column-G85 logic, Channel 9 must be set to 1 (OFF), otherwise faults can appear in 19-Gateway and 03-ABS. Also, VW says to determine the architecture from the J500 part number in the diagnostic printout, not from the sticker on the rack housing. (static.nhtsa.gov)

So in your case, after fitting a Gen2 rack and also fitting a steering column module with G85, my first suspicion is that module 44 is still configured to use the wrong G85 source.

Detailed problem analysis

A second very common issue is assuming that “the steering column module has G85” just because it fits physically. Ross-Tech’s module tables show that G85 support depends on the exact part-number suffix. Some 1K0-953-549 variants are marked No for steering angle sensor support, and some 5K0-953-569 variants are also No, while others are Yes. So without the exact suffix, “I installed a module with G85” is not enough to confirm compatibility. (wiki.ross-tech.com)

You also need to confirm that 44-Steering Assist is alive electrically. Ross-Tech’s diagnostic procedure for PQ35 steering assist shows that in measuring blocks, Group 004 Field 2 reports Terminal 15 status (“Term. 15 ON”), and Group 001 Field 2 should react when the steering torque sensor is exercised. If module 44 has no proper wake-up supply / ignition feed / communication, the rest of the calibration chain will fail. (wiki.ross-tech.com)

The CAN Gateway / installation coding also matters. On the PQ35 gateway, Ross-Tech documents coding entries for [44] Steering Assist, [16] Steering Wheel Electronics, and [00]/[04] Steering Angle Sensor (G85) depending on gateway version. If the gateway coding / installation list does not match the hardware now fitted, you can get persistent communication or plausibility faults. (wiki.ross-tech.com)

Basic settings: use the correct module

Do not perform the calibration blindly in the wrong controller. For MK60 / MK60EC1 ABS systems, Ross-Tech says the G85 basic setting is normally done in 03-ABS, with the live angle near center, then security access, then Basic Settings Group 060; after success, field 2 should show “OK”, and then the steering limit stop must also be adapted. Ross-Tech also notes that if the procedure reports “Adjustment Not Possible”, one cause can be a conflict in 16-Steering Wheel Electronics or 44-Steering Assist coding/adaptation. (wiki.ross-tech.com)

By contrast, Ross-Tech states that doing the G85 basic setting in 44-Steering Assist Group 060 applies to MK70-type cars, and explicitly says that procedure does not apply to MK60 / MK60EC1 in normal conditions. That is important, because many retrofit problems come from attempting the correct operation in the wrong module. (wiki.ross-tech.com)

After G85 basic setting succeeds, the steering limit stop adaptation still has to be completed. Ross-Tech’s PQ35 steering-assist procedure is: center the wheel briefly, hold full left lock, hold full right lock, re-center, cycle ignition, then road-test if needed. Ross-Tech also notes that if 02546 / 00778 still will not clear, one possible blocker is an implausible wheel speed sensor signal, even when a separate WSS DTC is not stored. (wiki.ross-tech.com)

Practical diagnostic order

Please check the car in exactly this order:

1. Auto-Scan first
I need the full scan, but especially:
- 03 - ABS Brakes
- 16 - Steering Wheel Electronics
- 19 - CAN Gateway
- 44 - Steering Assist
Ross-Tech itself recommends using the complete Auto-Scan for retrofit and coding issues. (wiki.ross-tech.com)

2. In 44-Steering Assist
- does the module communicate?
- what is the exact part number?
- is Adaptation Channel 9 present or not?
- what is the current value of Channel 9?
- in measuring blocks, does it show Term. 15 ON? (wiki.ross-tech.com)

3. In 16-Steering Wheel Electronics
- exact part number including suffix
- coding
- live steering-angle value
- does the module truly support G85 for that suffix? (wiki.ross-tech.com)

4. In 03-ABS
- exact faults
- ABS type / part number
- live G85 value before basic setting
For MK60EC1, Ross-Tech says the angle should be close to center, about ±1.5°, before Group 060 basic setting is attempted. (wiki.ross-tech.com)

5. In 19-Gateway
- confirm coding / installation list is consistent with 16 and 44 being present. (wiki.ross-tech.com)

What I think is most likely in your case

Given your description, the most probable causes are:

- Channel 9 in 44 is set for the wrong G85 source;
- the steering column module part number suffix does not actually support G85 the way you expect;
- 44-Steering Assist is missing proper ignition/wake-up supply or is not communicating correctly;
- basic setting was attempted in the wrong controller or before coding/adaptation conflicts were solved. (wiki.ross-tech.com)

What to post back

Please reply with:

- the exact DTCs from 03 / 16 / 19 / 44,
- the exact part numbers of:
- old rack,
- new Gen2 rack,
- steering column module,
- clock spring / slip ring,
- ABS module,
- and tell me whether 44 communicates and whether Channel 9 exists.

Once you post that, I can tell you whether your fix is:
- coding,
- Channel 9 adaptation,
- wrong steering column module,
- or power/wiring to J500.