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Audi B170AF1

Coding Step 2 not carried out

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceAudi service is appropriate because the verified manufacturer instruction specifies an ODIS-calculated test plan. Whether service is immediately required is not established by the supplied evidence.
Confidence95%

Quick answer

Audi DTC B170AF1 means “Coding Step 2 not carried out.” Verified Audi communications associate it with the driver assist systems control module J1121 (address 00A5), including after a software update. The specified action is to run the ODIS test plan calculated for B170AF1.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

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1. What does B170AF1 mean?

Audi DTC B170AF1 means “Coding Step 2 not carried out.” Verified Audi communications associate it with the driver assist systems control module J1121 (address 00A5), including after a software update. The specified action is to run the ODIS test plan calculated for B170AF1.

2. Technical explanation

A verified Audi/NHTSA manufacturer communication identifies B170AF1 as “Coding Step 2 not carried out,” static, with symptom code 2117696. The communication states that it may be found after a software update to the driver assist systems control module J1121 (address word 00A5). A later Audi communication refers to B170AF1 as “Calibration step 2 not carried out” and directs technicians to perform the ODIS test plan calculated for this DTC.

3. What system is affected?

Verified evidence identifies the driver assist systems control module J1121, address word 00A5. No further system scope is established by the supplied evidence.

4. How serious is this code?

Unknown. The supplied verified evidence does not assign a severity level.

5. Symptoms you may notice

  • A 2021 Audi communication states that there may be no customer concerns and that the DTC may be found during PDI or other diagnostic work.
  • No other symptoms are established by the supplied verified evidence.

6. Possible causes

  • The DTC may be stored after a software update for the driver assist systems control module J1121.
  • A root cause beyond the documented post-software-update context is not yet established by verified evidence.

7. Can I still drive the vehicle?

Not yet established by verified evidence.

8. Can I charge the vehicle?

Not yet established by verified evidence.

9. What you can safely do

  • Arrange diagnosis using the Audi ODIS test plan calculated for DTC B170AF1.
  • Do not infer driving, charging, or vehicle-safety status from this DTC alone; those statuses are not established in the supplied evidence.

10. Step-by-step troubleshooting

  1. Confirm whether B170AF1 is stored in driver assist systems control module J1121 (address 00A5).
  2. Use ODIS and perform the test plan calculated for DTC B170AF1, as directed in the verified Audi communication.
  3. The evidence does not support additional DIY diagnostic or repair procedures.

11. When to contact service

Audi service is appropriate because the verified manufacturer instruction specifies an ODIS-calculated test plan. Whether service is immediately required is not established by the supplied evidence.

12. What the service center may check

  • Read stored faults in driver assist systems control module J1121 (address 00A5).
  • Determine whether the DTC was stored after a control-module software update.
  • Perform the ODIS test plan calculated for B170AF1.

13. Possible repair or resolution

  • Follow the ODIS test plan calculated for B170AF1. The resulting repair or coding/calibration outcome is not specified in the supplied evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Audi/NHTSA Manufacturer Communication 10188599, published March 2, 2021: describes B170AF1 static with symptom code 2117696 after a software update to driver assist systems control module J1121; it notes there may be no customer concern and the DTC may be found during PDI or diagnostics.
  • Audi/NHTSA Manufacturer Communication 10231571, published February 2, 2023: identifies B170AF1 as “Calibration step 2 not carried out” and instructs technicians to perform the ODIS test plan calculated for the DTC.

16. Recall information

  • No recall information was supplied or established by verified evidence.

17. Official manufacturer information

Official NHTSA-hosted Audi manufacturer communications: https://static.nhtsa.gov/odi/tsbs/2021/MC-10188599-0001.pdf and https://static.nhtsa.gov/odi/tsbs/2023/MC-10231571-0001.pdf

19. Frequently asked questions

What does Audi code B170AF1 mean?

It means “Coding Step 2 not carried out.” A later Audi communication describes it as “Calibration step 2 not carried out.”

Where is B170AF1 documented?

Verified evidence associates it with the driver assist systems control module J1121, address word 00A5.

Can B170AF1 appear without a customer complaint?

Yes. A verified 2021 Audi communication states that there may be no customer concerns and the code may be found during PDI or other diagnostic work.

What is the documented Audi diagnostic action?

Perform the ODIS test plan calculated for DTC B170AF1.

Is it safe to drive or charge with B170AF1?

Not yet established by verified evidence.

20. Sources & verification

Verified
Audi B170AF1: Coding Step 2 not carried out | EV Diagnostics