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Audi U140500

Terminal 15 Implausible signal

DriveUnknown. One supplied bulletin includes U140500 among example DTCs in a condition where the vehicle cannot be driven; this does not establish that every vehicle with U140500 is undriveable.
ChargeNot yet established by verified evidence.
ServiceService is recommended when the documented electrical-system warning is present or U140500 is stored. The supplied evidence does not state a specific urgency classification.
Confidence95%

Quick answer

Audi DTC U140500 means “Terminal 15 Implausible signal.” Verified evidence links it to specific Audi service bulletins, but driving, charging, and overall severity are not yet established by verified evidence.

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 U140500 mean?

Audi DTC U140500 means “Terminal 15 Implausible signal.” Verified evidence links it to specific Audi service bulletins, but driving, charging, and overall severity are not yet established by verified evidence.

2. Technical explanation

For the 2022 Audi Q4 e-tron, an Audi Technical Service Bulletin documented U140500 in Electric Drive 2, J944 (address word 00CE), where it may accompany an intermittent instrument-cluster message: “Electrical system: fault. Please contact workshop.” The bulletin states that pins may have been damaged during an end-of-line production check and that wiring-harness assembly was optimized in production. A separate Audi bulletin concerning power electronics, J841 (address word 0051), lists U140500 among several possible stored DTCs when the vehicle cannot be driven. That bulletin states that the 12V wiring harness for J841 can be involved, but the supplied evidence does not establish that this applies to every occurrence of U140500.

3. What system is affected?

Terminal 15 signal. Verified bulletins reference Electric Drive 2, J944 (address word 00CE), and separately power electronics, J841 (address word 0051).

4. How serious is this code?

Unknown. Not yet established by verified evidence.

5. Symptoms you may notice

  • On certain 2022 Audi Q4 e-tron vehicles, the instrument cluster may intermittently display: “Electrical system: fault. Please contact workshop.”
  • One supplied Audi bulletin lists U140500 among DTCs that may be stored in a condition where the vehicle cannot be driven.

6. Possible causes

  • For the 2022 Audi Q4 e-tron bulletin covering Electric Drive 2, J944, pins may have been damaged during an end-of-line production check.
  • For the separate power-electronics bulletin, the 12V wiring harness for power electronics J841 can be involved. The supplied evidence does not establish the complete technical background or repair procedure.

7. Can I still drive the vehicle?

Unknown. One supplied bulletin includes U140500 among example DTCs in a condition where the vehicle cannot be driven; this does not establish that every vehicle with U140500 is undriveable.

8. Can I charge the vehicle?

Not yet established by verified evidence.

9. What you can safely do

  • If the instrument cluster displays “Electrical system: fault. Please contact workshop,” arrange diagnosis by an authorized Audi service provider.
  • Do not attempt high-voltage-system or wiring repairs yourself.
  • Record any warning messages and have the stored fault information evaluated by service personnel.

10. Step-by-step troubleshooting

  1. A qualified Audi technician can check whether U140500 is stored in Electric Drive 2, J944 (address word 00CE), as described in the Q4 e-tron bulletin.
  2. A qualified technician can determine whether the vehicle falls within the applicability of the cited Audi bulletins and inspect according to the applicable official service information.
  3. Not yet established by verified evidence: a universal diagnostic sequence for all Audi vehicles with U140500.

11. When to contact service

Service is recommended when the documented electrical-system warning is present or U140500 is stored. The supplied evidence does not state a specific urgency classification.

12. What the service center may check

  • For affected 2022 Q4 e-tron vehicles, evaluate the Electric Drive 2, J944 (address word 00CE) fault memory for U140500 and the other DTCs cited by the bulletin.
  • Determine whether connector pins or the applicable wiring harness are implicated under the relevant official Audi service bulletin.
  • For the separate J841 bulletin, assess the power-electronics 12V wiring-harness concern using official Audi service information.

13. Possible repair or resolution

  • For the Q4 e-tron bulletin, Audi states that wiring-harness assembly was optimized in production.
  • The supplied evidence does not provide a complete verified repair resolution for every U140500 occurrence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA Manufacturer Communication 10230846, Audi service communication A9423612068617_2, published January 17, 2023. It concerns 2022 Q4 e-tron/Q4 Sportback e-tron conditions involving U140500 in Electric Drive 2, J944, and an intermittent electrical-system warning.
  • NHTSA Manufacturer Communication 10227033, Audi service communication A9422602068617_1, published November 18, 2022. It concerns 2022 Q4 e-tron/Q4 Sportback e-tron conditions involving U140500 in Electric Drive 2, J944.
  • NHTSA Manufacturer Communication 10191577, Audi service communication A9421372063075_1, published April 30, 2021. It lists U140500 among example DTCs associated with a power-electronics J841 12V wiring-harness concern.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Official NHTSA-hosted manufacturer communications: https://static.nhtsa.gov/odi/tsbs/2023/MC-10230846-0001.pdf ; https://static.nhtsa.gov/odi/tsbs/2022/MC-10227033-0001.pdf ; https://static.nhtsa.gov/odi/tsbs/2021/MC-10191577-0001.pdf

19. Frequently asked questions

What does Audi U140500 mean?

It means “Terminal 15 Implausible signal.”

Which vehicles are verified as applicable?

Verified applicability records identify the US-market 2022 Audi Q4 e-tron and the US-market 2020 Audi Q5. The supplied Q4 e-tron bulletins specifically describe 2022 Q4 e-tron and Q4 Sportback e-tron vehicles.

Can I drive with U140500?

Not yet established by verified evidence. One supplied bulletin lists U140500 among DTCs that may be present when a vehicle cannot be driven, but that does not establish the outcome for every occurrence.

Can I charge with U140500?

Not yet established by verified evidence.

Is U140500 covered by a recall?

Not yet established by verified evidence.

20. Sources & verification

Verified
Audi U140500: Terminal 15 Implausible signal | EV Diagnostics