Fiat P1128
Closed Loop Fueling Not Achieved - Bank 1 Upstream. · P1524-00 - Oil Pressure Out Of Range - Camshaft Advance/Retard Disabled (Sales C
Quick answer
For a 2013 Fiat 500e in the US, verified NHTSA manufacturer communications 18-053-16 list P1128-00 as “Closed Loop Fueling Not Achieved - Bank 1 Upstream” and state that the MIL may illuminate. The supplied evidence does not establish a 500e-specific cause, repair, driving status, or charging status.
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 P1128 mean?
For a 2013 Fiat 500e in the US, verified NHTSA manufacturer communications 18-053-16 list P1128-00 as “Closed Loop Fueling Not Achieved - Bank 1 Upstream” and state that the MIL may illuminate. The supplied evidence does not establish a 500e-specific cause, repair, driving status, or charging status.
2. Technical explanation
P1128-00 is identified in the supplied official manufacturer-communication evidence as “Closed Loop Fueling Not Achieved - Bank 1 Upstream.” The same evidence also lists P1524-00, “Oil Pressure Out Of Range - Camshaft Advance/Retard Disabled,” but it does not establish that P1524 must be present whenever P1128 is stored. The diagnostic title and source text appear truncated after the P1524 description; no additional interpretation is established by the supplied evidence.
3. What system is affected?
Not yet established by verified evidence. The code description references closed-loop fueling and Bank 1 upstream, but the supplied evidence does not identify a 500e system, component, or subsystem affected.
4. How serious is this code?
Unknown. The supplied evidence confirms possible MIL illumination but does not assign a severity level.
5. Symptoms you may notice
- MIL illumination may occur.
6. Possible causes
- 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
- Record all stored diagnostic trouble codes and warning messages.
- Arrange diagnosis by a qualified service provider if the MIL is illuminated or P1128-00 is stored.
- Do not attempt high-voltage system repairs based on this code.
10. Step-by-step troubleshooting
- Verified evidence only establishes that a technician may find P1128-00 when investigating MIL illumination.
- No further diagnostic procedure, test sequence, wiring check, component test, or specification is provided in the supplied evidence.
11. When to contact service
Service need is not established by the supplied evidence. A qualified service provider can evaluate the MIL and stored DTCs.
12. What the service center may check
- Confirm whether P1128-00 is stored.
- Check whether P1524-00 is also stored; the official communication lists it alongside P1128-00.
- Not yet established by verified evidence what additional checks or repairs are required.
13. Possible repair or resolution
- Not yet established by verified evidence.
14. Affected vehicles
- Fiat 500e · 2013 · US
15. Related TSBs / service bulletins
- NHTSA Manufacturer Communication 10140265, bulletin 18-053-16, published May 6, 2016: lists possible MIL illumination and P1128-00, “Closed Loop Fueling Not Achieved - Bank 1 Upstream,” along with P1524-00.
- NHTSA Manufacturer Communication 10218314, bulletin 18-053-16, published May 6, 2016: contains the same supplied summary.
16. Recall information
- No recall information is provided in the supplied verified evidence.
17. Official manufacturer information
Official source: NHTSA manufacturer communications 10140265 and 10218314, bulletin 18-053-16, published May 6, 2016. Applicability supplied: 2013 Fiat 500e, US. Source URL: https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2015-2019.zip#nhtsa_id=10140265
- NHTSA: NHTSA Manufacturer Communication 10140265: 18-053-16 · official_tsb
- NHTSA: NHTSA Manufacturer Communication 10218314: 18-053-16 · official_tsb
19. Frequently asked questions
What does P1128-00 mean?
The supplied official manufacturer-communication evidence defines it as “Closed Loop Fueling Not Achieved - Bank 1 Upstream.”
What symptom is verified for P1128-00?
The official communication states that the MIL may illuminate.
Does P1128-00 mean the Fiat 500e high-voltage battery has failed?
Not yet established by verified evidence.
Can I drive or charge the vehicle with P1128-00?
Not yet established by verified evidence.
Is there an official bulletin?
Yes. The supplied evidence identifies NHTSA manufacturer communications 10140265 and 10218314, both associated with bulletin 18-053-16.