Cadillac P0BBE
Hybrid Battery Pack Voltage Variation Note: The vehicle will prevent a subsequent start attempt with a latched DTC P0AFA. Cause This condition may be caused by one or more of the 9
Quick answer
For a 2014–2016 Cadillac ELR in the US, DTC P0BBE is identified in GM bulletin 19NA117 as Hybrid Battery Pack Voltage Variation. The bulletin links it to possible degradation of one or more high-voltage battery cell groups, which can have lower voltage than the rest of the pack.
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 P0BBE mean?
For a 2014–2016 Cadillac ELR in the US, DTC P0BBE is identified in GM bulletin 19NA117 as Hybrid Battery Pack Voltage Variation. The bulletin links it to possible degradation of one or more high-voltage battery cell groups, which can have lower voltage than the rest of the pack.
2. Technical explanation
GM bulletin 19NA117 states that P0BBE may be set when one or more of the 96 cell groups in the high-voltage battery pack may have degraded. A degraded cell group may have lower voltage than the other cell groups, creating battery-pack voltage variation. The bulletin also identifies P0AFA, Hybrid/EV Battery System Voltage Low Voltage, in the same condition context and notes that the vehicle will prevent a subsequent start attempt when P0AFA is latched.
3. What system is affected?
High-voltage hybrid/EV battery pack, including its 96 cell groups.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- No start.
- Loss or reduction in propulsion before a no-start event.
6. Possible causes
- One or more of the 96 high-voltage battery cell groups may have degraded.
- A degraded cell group may have lower voltage than the other cell groups in the battery pack.
7. Can I still drive the vehicle?
Not yet established by verified evidence. The verified bulletin reports possible loss or reduction in propulsion before a no-start event.
8. Can I charge the vehicle?
Not yet established by verified evidence.
9. What you can safely do
- Arrange diagnosis by qualified service personnel familiar with high-voltage battery systems.
- Do not attempt high-voltage battery disassembly or cell-level repair.
- If propulsion is lost or reduced, follow applicable vehicle warnings and arrange service.
10. Step-by-step troubleshooting
- Have a qualified technician retrieve and assess stored DTCs, including P0BBE and P0AFA if present.
- Use the applicable GM service information and bulletin 19NA117 for diagnosis. Further diagnostic steps are not established by the supplied verified evidence.
11. When to contact service
Contact a Cadillac/GM service facility or other qualified high-voltage vehicle service provider, particularly if the vehicle has reduced propulsion or will not start.
12. What the service center may check
- Confirm whether P0BBE is stored.
- Check for P0AFA in the context described by GM bulletin 19NA117.
- Assess high-voltage battery cell-group voltage variation using applicable GM service information. Specific test procedures are not established by the supplied verified evidence.
13. Possible repair or resolution
- Not yet established by verified evidence. The supplied bulletin evidence identifies degraded cell groups as a possible cause but does not provide a verified repair procedure in the supplied material.
14. Affected vehicles
- Cadillac ELR · 2014–2016 · US
15. Related TSBs / service bulletins
- GM bulletin 19NA117, published May 24, 2019, applies to North American Cadillac ELR model years 2014–2016 and identifies P0BBE in connection with possible high-voltage battery cell-group degradation.
- NHTSA manufacturer communication: https://static.nhtsa.gov/odi/tsbs/2019/MC-10161927-9999.pdf
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
NHTSA-hosted GM manufacturer communication 19NA117: https://static.nhtsa.gov/odi/tsbs/2019/MC-10161927-9999.pdf
19. Frequently asked questions
What does P0BBE mean on a Cadillac ELR?
GM bulletin 19NA117 identifies P0BBE as Hybrid Battery Pack Voltage Variation.
What can cause P0BBE?
The verified bulletin states that one or more of the 96 high-voltage battery cell groups may have degraded, and a degraded group may have lower voltage than the rest of the pack.
Can P0BBE cause a no-start condition?
The bulletin lists no start as a reported customer condition and notes that a subsequent start attempt will be prevented when DTC P0AFA is latched.
Is P0AFA related to P0BBE?
GM bulletin 19NA117 lists both P0AFA and P0BBE for the described condition. P0AFA is identified there as Hybrid/EV Battery System Voltage Low Voltage.