Chevrolet P026A
The technician should follow SI diagnostics. If no cause for the concern is found or during
Quick answer
For Chevrolet vehicles covered by GM bulletin PIP5684-series, P026A may be stored with an illuminated MIL and intermittent reduced engine power. The bulletin identifies a possible leak in the charge-air-cooler/induction system and directs technicians to follow SI diagnostics. This evidence is for engine/induction concerns, not an EV high-voltage diagnosis.
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 P026A mean?
For Chevrolet vehicles covered by GM bulletin PIP5684-series, P026A may be stored with an illuminated MIL and intermittent reduced engine power. The bulletin identifies a possible leak in the charge-air-cooler/induction system and directs technicians to follow SI diagnostics. This evidence is for engine/induction concerns, not an EV high-voltage diagnosis.
2. Technical explanation
Verified NHTSA-posted GM manufacturer communications PIP5684, PIP5684A, PIP5684B, and PIP5684C list P026A among numerous history or current DTCs that may occur with an illuminated MIL and intermittent reduced engine power. The communications state that the concern may be due to a leak in the charge air cooler/induction systems. The specified correction is to follow SI diagnostics. The supplied evidence does not establish a standalone definition of P026A beyond this bulletin context.
3. What system is affected?
Charge-air-cooler/induction system is identified as a possible area of concern in the cited GM bulletin. A specific EV propulsion or high-voltage system is not established by verified evidence.
4. How serious is this code?
Unknown. The supplied evidence does not assign a severity level.
5. Symptoms you may notice
- MIL illuminated.
- Intermittent reduced engine power may be reported.
6. Possible causes
- A leak in the charge air cooler/induction systems may cause the concern, according to GM bulletin PIP5684-series.
- Other causes are 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
- Arrange diagnosis using the applicable Chevrolet/GM SI diagnostic procedure.
- Do not attempt high-voltage or other hazardous repair work based on this code page.
10. Step-by-step troubleshooting
- A technician should follow SI diagnostics, as directed by GM bulletin PIP5684-series.
- The supplied evidence does not provide a verified step-by-step inspection or repair procedure.
11. When to contact service
Service is appropriate if the MIL is illuminated or reduced engine power is present. Ask the service provider to evaluate P026A and any accompanying DTCs using the applicable GM SI diagnostics.
12. What the service center may check
- Retrieve and assess current and history DTCs.
- Follow applicable GM SI diagnostics for the reported concern and stored codes.
- Evaluate the charge-air-cooler/induction system as indicated by GM bulletin PIP5684-series.
13. Possible repair or resolution
- No specific repair is established by the supplied verified evidence.
- GM's stated resolution is to follow SI diagnostics.
14. Affected vehicles
- Chevrolet Bolt EV · 2011–2018 · US
- Chevrolet Spark · 2011–2018 · US
- Chevrolet Volt · 2011–2018 · US
15. Related TSBs / service bulletins
- GM PIP5684, NHTSA manufacturer communication MC-10167455-9999, published October 22, 2019: lists P026A among possible DTCs; states the concern may be due to a charge-air-cooler/induction-system leak and directs SI diagnostics. https://static.nhtsa.gov/odi/tsbs/2019/MC-10167455-9999.pdf
- GM PIP5684A, NHTSA manufacturer communication MC-10176300-9999, published May 5, 2020. https://static.nhtsa.gov/odi/tsbs/2020/MC-10176300-9999.pdf
- GM PIP5684B, NHTSA manufacturer communication MC-10178370-9999, published July 13, 2020. https://static.nhtsa.gov/odi/tsbs/2020/MC-10178370-9999.pdf
- GM PIP5684C, NHTSA manufacturer communication MC-10182564-9999, published October 22, 2020. https://static.nhtsa.gov/odi/tsbs/2020/MC-10182564-9999.pdf
16. Recall information
- No recall information was supplied or established by verified evidence.
17. Official manufacturer information
The verified sources are NHTSA-hosted GM manufacturer communications PIP5684 through PIP5684C. They describe a possible charge-air-cooler/induction-system leak in a multi-code engine diagnostic context and direct technicians to GM SI diagnostics.
- NHTSA: NHTSA Manufacturer Communication PDF 10167455: PIP5684 · official_tsb
- NHTSA: NHTSA Manufacturer Communication PDF 10176300: PIP5684A · official_tsb
- NHTSA: NHTSA Manufacturer Communication PDF 10178370: PIP5684B · official_tsb
- NHTSA: NHTSA Manufacturer Communication PDF 10182564: PIP5684C · official_tsb
19. Frequently asked questions
What does the verified GM bulletin say about P026A?
It lists P026A among possible current or history DTCs that may accompany an illuminated MIL and intermittent reduced engine power. It states that a charge-air-cooler/induction-system leak may be involved and directs technicians to follow SI diagnostics.
Is P026A verified here as a Bolt EV high-voltage battery or charging fault?
No. That is not established by the supplied verified evidence.
Which vehicles are listed in the supplied applicability data?
Chevrolet Bolt EV, Spark, and Volt, model years 2011 through 2018, United States. However, the supplied bulletin evidence describes engine/induction concerns; exact bulletin applicability to each listed model is not established by the evidence provided.
Is it safe to drive or charge?
Not yet established by verified evidence.