Cadillac P3029
no MIL, type C
Quick answer
For a 2023 Cadillac LYRIQ in the US, DTC P3029 is documented by Cadillac bulletin PIP5890A as a no-MIL, Type C code that can occur when the charge-port cable mechanism is out of position. The bulletin states that DC fast-charging may be limited to about 33 kW rather than a normal peak of 190 kW, with no customer message displayed.
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 P3029 mean?
For a 2023 Cadillac LYRIQ in the US, DTC P3029 is documented by Cadillac bulletin PIP5890A as a no-MIL, Type C code that can occur when the charge-port cable mechanism is out of position. The bulletin states that DC fast-charging may be limited to about 33 kW rather than a normal peak of 190 kW, with no customer message displayed.
2. Technical explanation
Verified evidence links P3029 to the charge-port cable position mechanism. The NHTSA-published Cadillac communication states that pushing on the cable after it has been pulled can force it out of the correct position and cause mechanism problems. If the vehicle detects the cable out of position, it may set P3013 and/or P3029, without illuminating the MIL or displaying a customer message. The bulletin directs a cable-retraction measurement at the top end next to the loop to determine whether the cable is fully retracted.
3. What system is affected?
Charge-port cable mechanism / DC fast-charging operation.
4. How serious is this code?
The diagnostic record lists severity as unknown. Verified evidence establishes potentially substantial DC fast-charge rate limitation, but does not establish a broader safety severity.
5. Symptoms you may notice
- DC fast charging may be limited to approximately 33 kW instead of a normal peak of 190 kW.
- P3029 may be stored with no MIL.
- No customer message may be displayed about the cable or DTC.
- P3013 and/or P3029 may set when the vehicle detects the cable out of position.
6. Possible causes
- The charge-port cable may be out of the correct position.
- Pushing on the cable after it has been pulled may force the cable out of position and cause problems with the mechanism.
7. Can I still drive the vehicle?
Not yet established by verified evidence.
8. Can I charge the vehicle?
Charging capability is not fully established by verified evidence. The bulletin states that DC fast charging may be limited to approximately 33 kW when the cable is out of position.
9. What you can safely do
- Do not push on the cable after it has been pulled, as the verified bulletin warns this can force the cable out of position.
- Arrange Cadillac service if DC fast charging is unexpectedly limited or P3029 is identified.
- Do not attempt high-voltage or charge-port mechanism repairs yourself.
10. Step-by-step troubleshooting
- A qualified service technician can use the bulletin’s specified measurement at the top end next to the loop to determine whether the cable has fully retracted.
- A shorter measurement may indicate an improper cable position, including a position caused by attempting to push the cable to retract it.
11. When to contact service
Contact a Cadillac dealer or qualified Cadillac EV service facility for diagnosis of the charge-port cable mechanism and the reduced DC fast-charging condition.
12. What the service center may check
- Check whether the charge-port cable has fully retracted using the measurement procedure referenced in Cadillac bulletin PIP5890A.
- Inspect for an improper cable position associated with a pushing attempt after the cable was pulled.
- Confirm whether P3013 and/or P3029 are stored and whether DC fast-charge power is limited.
13. Possible repair or resolution
- Verified evidence does not establish a specific repair resolution. Cadillac bulletin PIP5890A identifies cable position and provides a method to assess full retraction.
14. Affected vehicles
- Cadillac LYRIQ · 2023 · US
15. Related TSBs / service bulletins
- Cadillac PIP5890A, published through NHTSA as Manufacturer Communication MC-10245988 on October 4, 2023. It addresses a charge-port cable mechanism condition that may limit DC fast charging to approximately 33 kW and set P3013 and/or P3029 without a MIL or customer message.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Official source: NHTSA Manufacturer Communication MC-10245988, Cadillac PIP5890A: https://static.nhtsa.gov/odi/tsbs/2023/MC-10245988-9999.pdf
19. Frequently asked questions
What does P3029 mean on a 2023 Cadillac LYRIQ?
The supplied diagnostic record identifies P3029 as “no MIL, type C.” Cadillac bulletin PIP5890A associates it with the vehicle detecting a charge-port cable that is out of position.
Will P3029 turn on the check-engine light?
The verified bulletin states that P3013 and/or P3029 can set with no MIL.
Can P3029 reduce DC fast-charging speed?
Yes. The verified bulletin states that an out-of-position cable can limit DC fast charging to approximately 33 kW, compared with a normal peak of 190 kW.
Will the vehicle show a charge-port warning message?
The verified bulletin states that no customer message is displayed about the cable or the DTC codes.
Which vehicles are supported by the supplied evidence?
The supplied applicability evidence covers the US-market 2023 Cadillac LYRIQ.