Chevrolet P228B
Forced Engine Shutdown • DTC P2635 Fuel Pump Flow Performance Correction Bring the vehicle inside to allow the diesel fuel to warm up to more than 0°C (32°F). Confirm the engine wi
Quick answer
For 2022 Chevrolet Bolt EV and Bolt EUV in the US, verified evidence associates P228B with a Chevrolet manufacturer communication about fuel-system DTCs in cold conditions. However, the supplied evidence describes diesel fuel waxing/icing and an engine-control module, which does not establish a Bolt-specific fault mechanism or repair. 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 P228B mean?
For 2022 Chevrolet Bolt EV and Bolt EUV in the US, verified evidence associates P228B with a Chevrolet manufacturer communication about fuel-system DTCs in cold conditions. However, the supplied evidence describes diesel fuel waxing/icing and an engine-control module, which does not establish a Bolt-specific fault mechanism or repair. Not yet established by verified evidence.
2. Technical explanation
The supplied NHTSA-hosted Chevrolet communication 18NA103 lists P228B as “Fuel Pressure Regulator 2 Control - Forced Engine Shutdown” among DTCs that may be observed in the K20 Engine Control Module. Its evidence summary states that diesel fuel may gel or develop solids that block an in-tank fuel-pump pickup. The communication instructs bringing the vehicle inside to warm diesel fuel above 0°C (32°F), then confirming that the engine starts and fuel-pump whining is gone. This source content is internally inconsistent with the supplied 2022 Bolt EV/Bolt EUV applicability because those vehicles are battery-electric and the source summary concerns diesel fuel and an engine. Therefore, a P228B diagnosis, fault mechanism, or repair specific to the Bolt EV or Bolt EUV is not yet established by verified evidence.
3. What system is affected?
Verified source: fuel-pressure regulation / fuel-pump flow in the K20 Engine Control Module. A Bolt EV/Bolt EUV-specific affected system is not yet established by verified evidence.
4. How serious is this code?
Unknown. The diagnostic record provides severity as unknown.
5. Symptoms you may notice
- The verified source says technicians may observe P228B in the K20 Engine Control Module.
- The verified source references a whining noise from the fuel pump in the diesel-fuel condition it describes.
- Bolt EV/Bolt EUV-specific symptoms are not yet established by verified evidence.
6. Possible causes
- The verified source describes diesel fuel gelling and/or solids blocking an in-tank fuel-pump pickup during cold conditions.
- Whether that condition can cause P228B on a 2022 Chevrolet Bolt EV or Bolt EUV is not yet established by verified evidence.
7. Can I still drive the vehicle?
Unknown. The diagnostic record provides safe-to-drive status as unknown.
8. Can I charge the vehicle?
Unknown. The diagnostic record provides safe-to-charge status as unknown.
9. What you can safely do
- Do not assume the diesel-fuel warming procedure applies to a Bolt EV or Bolt EUV.
- Arrange professional diagnosis using the vehicle VIN, stored DTCs, and manufacturer service information.
- Do not perform high-voltage system repairs or modifications.
10. Step-by-step troubleshooting
- Verify the exact vehicle, VIN, model year, market, and all stored diagnostic codes.
- Have a qualified Chevrolet service provider determine whether P228B is valid for the vehicle and whether the referenced communication applies.
- The source’s diesel-fuel instruction is only verified for the diesel-fuel scenario described in communication 18NA103; applicability to Bolt EV/Bolt EUV is not established.
11. When to contact service
Contact a Chevrolet dealer or qualified service provider for VIN-specific diagnosis. The supplied evidence does not establish a Bolt-specific repair procedure.
12. What the service center may check
- Confirm whether P228B is currently stored and identify the reporting control module.
- Review VIN-specific Chevrolet service information and applicable manufacturer communications.
- Assess whether the NHTSA-hosted communication 18NA103 is applicable before using its recommendations.
13. Possible repair or resolution
- For the diesel-fuel scenario in the verified source, Chevrolet communication 18NA103 states to warm the diesel fuel above 0°C (32°F) and confirm the engine starts and fuel-pump whining is gone.
- A repair or resolution for P228B on a 2022 Bolt EV or Bolt EUV is not yet established by verified evidence.
14. Affected vehicles
- Chevrolet Bolt EUV · 2022 · US
- Chevrolet Bolt EV · 2022 · US
15. Related TSBs / service bulletins
- NHTSA Manufacturer Communication PDF 10212607, Chevrolet communication 18NA103, published January 19, 2022. It lists P228B among diesel fuel-system DTCs and discusses fuel waxing/icing. Its applicability to 2022 Bolt EV/Bolt EUV is not established by the supplied source summary.
16. Recall information
- No recall information was supplied or established by verified evidence.
17. Official manufacturer information
NHTSA-hosted Chevrolet manufacturer communication 18NA103: https://static.nhtsa.gov/odi/tsbs/2022/MC-10212607-9999.pdf
19. Frequently asked questions
What does P228B mean in the supplied official communication?
It is listed as “Fuel Pressure Regulator 2 Control - Forced Engine Shutdown.”
Does the supplied evidence prove a P228B repair for a 2022 Bolt EV or Bolt EUV?
No. The source concerns diesel fuel, an in-tank fuel pump, and the K20 Engine Control Module; Bolt-specific diagnosis and repair are not yet established by verified evidence.
Does the source provide a cold-weather procedure?
For the diesel-fuel condition described, it says to bring the vehicle inside and warm diesel fuel above 0°C (32°F), then confirm engine starting and that fuel-pump whining is gone. This procedure is not established as applicable to Bolt EV/Bolt EUV.