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01042 – Control Module Not Coded (VAG Group)

On VAG vehicles, fault code 01042 means "Control Module Not Coded". Below are the real-world causes, step-by-step tests and OEM part numbers.

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01042 quick summary

Fault code01042
MeaningControl Module Not Coded
SystemNetwork / CAN Bus
VehiclesVAG (VW, Audi, Škoda, Seat)
Common onAll VAG models diagnosed with VCDS/ODIS, After fitting a new or used control module
SeverityLow
Can I drive?Usually yes, but the module may not work at all (e.g. ABS, parking sensors or comfort functions) until it is coded.
Repair cost€0 – €120

Symptoms of 01042

  • Code appears after replacing a control module
  • Function of that module not working
  • Warning lights (e.g. ABS/ESP)
  • Coding shows 00000 or blank
  • Other modules report communication or coding faults

Most common causes of 01042 (most likely first)

Mechanic's Pro Tip

01042 means the module has no coding at all – typical after fitting a new module. Read the old module's coding if you still have it, or build the coding from the vehicle's equipment (VCDS shows long-coding helpers). Some modules (ABS, airbag, immobilizer) also need adaptation or online login after coding.

  1. 1.New control module fitted without coding

    Most likely

  2. 2.Coding lost after a failed programming

  3. 3.Used module with incompatible coding cleared

  4. 4.Wrong module variant for the car

  5. 5.Low voltage during coding

Step-by-step diagnostic guide

  1. 1

    Identify which module reports 01042.

  2. 2

    Read its part number and software version.

  3. 3

    Find the correct coding (old module, equipment list or coding helper).

  4. 4

    Code the module and run any required adaptations.

  5. 5

    Clear codes and test the function.

How do I read fault codes? →Where the OBD2 port is, which scanner to use and how to read and clear codes step by step.

Frequently asked questions

What is the difference between 01042 and 01044?

01042 means no coding at all; 01044 means the coding exists but doesn't match the car.

Can I code it with OBDeleven?

Yes, VCDS and OBDeleven can code most modules; some need online access.

Related fault codes

This guide is for information only. Working on vehicles can be dangerous — if you are unsure, have the car checked by a qualified mechanic. Values can differ between model years; always check the manufacturer's repair information.