EV Diagnostics
Verified EV diagnostic knowledge page

Audi B18AC13

Motor for rear spoiler drive 1, Open circuit

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceAudi service evaluation is appropriate because an official Audi manufacturer communication addresses this DTC and rear spoiler operation concern. Whether service is required is not established by the supplied verified evidence.
Confidence95%

Quick answer

B18AC13 is an Audi DTC meaning: “Motor for rear spoiler drive 1, Open circuit.” Verified Audi service information identifies a possible loss of contact inside the rear spoiler drive motor that can cause intermittent or permanent rear-spoiler operation loss.

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

Video guides

Watch Videos

Relevant videos play here without leaving this diagnostic page.

No sufficiently relevant embeddable video has been accepted for this diagnostic yet.

Videos are supporting material and never override OEM or regulator evidence.

1. What does B18AC13 mean?

B18AC13 is an Audi DTC meaning: “Motor for rear spoiler drive 1, Open circuit.” Verified Audi service information identifies a possible loss of contact inside the rear spoiler drive motor that can cause intermittent or permanent rear-spoiler operation loss.

2. Technical explanation

Audi service information states that insufficient pressure of the carbon brushes against the motor commutator in the spoiler drive motor can cause loss of contact. This may result in intermittent or permanent loss of rear spoiler operation and may store B18AC13 in aerodynamic control module J223 (address word 006B).

3. What system is affected?

Rear spoiler drive / aerodynamic control module J223 (address word 006B).

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • The rear spoiler may be inoperative automatically and manually.
  • The rear spoiler system may remain fully operative in some cases.
  • Intermittent or permanent loss of rear spoiler operation may occur.
  • A message may appear in the driver’s information system; the exact message text is not established by the supplied verified evidence.

6. Possible causes

  • Verified Audi service information identifies insufficient pressure of the carbon brushes to the motor commutator in the spoiler drive motor, causing a loss of contact.
  • Not yet established by verified evidence: other causes of B18AC13.

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

  • Have the stored fault assessed by an Audi-qualified service facility.
  • Do not attempt to disassemble or repair the rear spoiler drive motor based on this information alone.

10. Step-by-step troubleshooting

  1. Confirm whether B18AC13 is stored in aerodynamic control module J223, address word 006B.
  2. Confirm whether the rear spoiler operates automatically and manually.
  3. Further diagnostic steps are not established by the supplied verified evidence.

11. When to contact service

Audi service evaluation is appropriate because an official Audi manufacturer communication addresses this DTC and rear spoiler operation concern. Whether service is required is not established by the supplied verified evidence.

12. What the service center may check

  • Check for B18AC13 in aerodynamic control module J223 (address word 006B).
  • Assess rear spoiler operation in automatic and manual operation modes.
  • Inspecting or testing the motor beyond these points is not established by the supplied verified evidence.

13. Possible repair or resolution

  • The supplied official communications identify the spoiler drive motor brush-to-commutator contact issue as technical background.
  • The specific repair procedure or parts resolution is not established by the supplied verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA Manufacturer Communication PDF 10204731, published December 7, 2021: https://static.nhtsa.gov/odi/tsbs/2021/MC-10204731-0001.pdf
  • NHTSA Manufacturer Communication PDF 10209108, published March 10, 2022: https://static.nhtsa.gov/odi/tsbs/2022/MC-10209108-0001.pdf

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified NHTSA-hosted Audi manufacturer communications describe B18AC13, rear spoiler operation concerns, and the identified motor brush-contact technical background. Applicability in the supplied data is limited to US-market 2021–2022 Audi A7, 2021–2022 Audi e-tron GT, and 2021–2022 Audi RS e-tron GT.

19. Frequently asked questions

What does Audi code B18AC13 mean?

It means “Motor for rear spoiler drive 1, Open circuit.”

What may happen when B18AC13 is present?

The rear spoiler may be inoperative automatically and manually, although Audi states that the system can remain fully operative in some cases.

What cause is identified in the official communication?

Audi identifies possible loss of contact caused by insufficient carbon-brush pressure against the spoiler drive motor commutator.

Is B18AC13 applicable to an Audi EV?

The supplied applicability evidence includes US-market 2021–2022 Audi e-tron GT and 2021–2022 Audi RS e-tron GT.

Can I continue driving or charging?

Not yet established by verified evidence.

20. Sources & verification

Verified
Audi B18AC13: Motor for rear spoiler drive 1, Open circuit | EV Diagnostics