Chevrolet P012B
The technician
Quick answer
For Chevrolet vehicles, verified NHTSA manufacturer communications PIP5684, PIP5684A, and PIP5684B list P012B among numerous possible current or history DTCs associated with a MIL and, intermittently, reduced engine power. Those bulletins state that a leak in the charge-air-cooler/induction system may be the cause. This evidence does not establish that the bulletin applies to the listed Bolt EV, Spark, or Volt vehicles.
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 P012B mean?
For Chevrolet vehicles, verified NHTSA manufacturer communications PIP5684, PIP5684A, and PIP5684B list P012B among numerous possible current or history DTCs associated with a MIL and, intermittently, reduced engine power. Those bulletins state that a leak in the charge-air-cooler/induction system may be the cause. This evidence does not establish that the bulletin applies to the listed Bolt EV, Spark, or Volt vehicles.
2. Technical explanation
The supplied diagnostic record labels P012B as “The technician,” but that wording is not a technical code definition established by the supplied evidence. The verified manufacturer communications instead identify P012B only as one code in a large group that may be present as current or history codes during the documented condition. The bulletins direct professional diagnostic evaluation for a possible charge-air-cooler/induction-system leak; the supplied excerpt does not provide the complete procedure.
3. What system is affected?
A charge-air-cooler/induction system is referenced by the verified Chevrolet manufacturer communications. The affected system for the supplied vehicle applicability entries is not yet established by verified evidence.
4. How serious is this code?
Unknown. The supplied record lists severity as unknown.
5. Symptoms you may notice
- Malfunction Indicator Lamp (MIL) illuminated.
- Intermittent reduced engine power may be reported.
6. Possible causes
- A leak in the charge-air-cooler/induction system may be the cause, according to Chevrolet manufacturer communications PIP5684, PIP5684A, and PIP5684B.
7. Can I still drive the vehicle?
Not yet established by verified evidence. The supplied record lists safe-to-drive status as unknown.
8. Can I charge the vehicle?
Not yet established by verified evidence. The supplied record lists safe-to-charge status as unknown.
9. What you can safely do
- Arrange professional diagnosis if the MIL is illuminated or reduced engine power occurs.
- Do not attempt high-voltage-system repairs based on this code; no high-voltage repair procedure is established by the supplied evidence.
10. Step-by-step troubleshooting
- A qualified technician should use the applicable Chevrolet manufacturer diagnostic information. The supplied bulletins associate the condition with a possible charge-air-cooler/induction-system leak, but the excerpt does not establish a complete diagnostic sequence.
11. When to contact service
Service need is not yet established by the diagnostic record, which lists service-required status as unknown. However, professional diagnosis is appropriate when the documented MIL or intermittent reduced-power condition is present.
12. What the service center may check
- Check the applicable Chevrolet manufacturer communication PIP5684B (NHTSA MC-10178370), PIP5684A (NHTSA MC-10176300), or PIP5684 (NHTSA MC-10167455) for the complete procedure.
- Evaluate for a possible charge-air-cooler/induction-system leak only where the applicable bulletin and vehicle configuration support that diagnosis.
13. Possible repair or resolution
- Not yet established by verified evidence. The supplied excerpts state that the technician should follow a correction, but do not provide the complete correction procedure or a verified repair outcome.
14. Affected vehicles
- Chevrolet Bolt EV · 2011–2018 · US
- Chevrolet Spark · 2011–2018 · US
- Chevrolet Volt · 2011–2018 · US
15. Related TSBs / service bulletins
- Chevrolet PIP5684B, NHTSA Manufacturer Communication MC-10178370, published July 13, 2020. It lists P012B among possible current/history codes and states a charge-air-cooler/induction-system leak may cause the concern.
- Chevrolet PIP5684A, NHTSA Manufacturer Communication MC-10176300, published May 5, 2020. It lists P012B among possible current/history codes and states a charge-air-cooler/induction-system leak may cause the concern.
- Chevrolet PIP5684, NHTSA Manufacturer Communication MC-10167455, published October 22, 2019. It lists P012B among possible current/history codes and states a charge-air-cooler/induction-system leak may cause the concern.
16. Recall information
- Not yet established by verified evidence. No recall evidence was supplied.
17. Official manufacturer information
Verified sources: NHTSA-hosted Chevrolet manufacturer communications PIP5684B: https://static.nhtsa.gov/odi/tsbs/2020/MC-10178370-9999.pdf; PIP5684A: https://static.nhtsa.gov/odi/tsbs/2020/MC-10176300-9999.pdf; PIP5684: https://static.nhtsa.gov/odi/tsbs/2019/MC-10167455-9999.pdf.
19. Frequently asked questions
What does the supplied evidence say about P012B?
It says Chevrolet manufacturer communications list P012B among many possible current or history DTCs when a vehicle has an illuminated MIL and may intermittently have reduced engine power.
What cause is identified?
The communications state that a leak in the charge-air-cooler/induction system may be the cause.
Does this prove the cause on every vehicle with P012B?
No. The bulletins list P012B in a broad group of codes; they do not establish that a charge-air-cooler/induction leak is the cause in every case.
Do the supplied bulletins apply to a Chevrolet Bolt EV, Spark, or Volt?
Not yet established by verified evidence. The supplied applicability data lists these models and years, but the supplied bulletin excerpts do not confirm model-specific applicability.