Chevrolet P1AEF
Perform the high voltage disable procedure and check for damaged high voltage connectors and terminals at the K10 Coolant Heater Control Module. If there are signs of arcing or ter
Quick answer
For a 2016–2017 Chevrolet Volt in North America, P1AEF is documented in Chevrolet bulletin PIC6266 in connection with the K10 Coolant Heater Control Module high-voltage connector X2. The bulletin directs service personnel to perform the high-voltage disable procedure and inspect the module’s high-voltage connectors and terminals for damage, arcing, or terminal damage.
This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.
Watch Videos
Relevant videos play here without leaving this diagnostic page.
No sufficiently relevant embeddable video has been accepted for this diagnostic yet.
Videos are supporting material and never override OEM or regulator evidence.
1. What does P1AEF mean?
For a 2016–2017 Chevrolet Volt in North America, P1AEF is documented in Chevrolet bulletin PIC6266 in connection with the K10 Coolant Heater Control Module high-voltage connector X2. The bulletin directs service personnel to perform the high-voltage disable procedure and inspect the module’s high-voltage connectors and terminals for damage, arcing, or terminal damage.
2. Technical explanation
NHTSA manufacturer communication PIC6266 states that connector X2 at the K10 Coolant Heater Control Module may not have been fully seated during vehicle assembly. The supplied bulletin evidence associates this condition with P1AEF, sometimes alongside P1AEE, and instructs inspection after the high-voltage disable procedure.
3. What system is affected?
High-voltage connector X2 and terminals at the K10 Coolant Heater Control Module.
4. How serious is this code?
Not yet established by verified evidence. However, the official bulletin describes possible no-start or loss-of-propulsion complaints in some cases.
5. Symptoms you may notice
- Service Heater message in the Driver Information Center (DIC).
- Check-engine lamp in some cases.
- No-start in some cases.
- Loss of propulsion in some cases.
- Additional DTC P1AEE may be present in some cases.
- DTC B048E symptom 00 is described in the bulletin condition.
6. Possible causes
- The high-voltage connector X2 at the K10 Coolant Heater Control Module may not have been fully seated at the vehicle assembly plant.
- The bulletin directs inspection for damaged high-voltage connectors or terminals, including signs of arcing or terminal damage.
7. Can I still drive the vehicle?
Not yet established by verified evidence. Because the bulletin reports possible loss of propulsion, arrange professional assessment rather than relying on continued operation.
8. Can I charge the vehicle?
Not yet established by verified evidence.
9. What you can safely do
- If there is a no-start or loss-of-propulsion condition, seek professional service.
- Have a qualified Chevrolet/EV service technician evaluate the vehicle using the applicable high-voltage safety procedure.
- Do not attempt high-voltage connector or terminal inspection yourself.
10. Step-by-step troubleshooting
- A qualified technician should perform the high-voltage disable procedure.
- Inspect the high-voltage connectors and terminals at the K10 Coolant Heater Control Module.
- Check connector X2 for proper seating and inspect for arcing or terminal damage, as directed by PIC6266.
11. When to contact service
Contact a Chevrolet dealer or qualified EV service facility, particularly if a Service Heater message, check-engine lamp, no-start, or loss of propulsion occurs.
12. What the service center may check
- Perform the high-voltage disable procedure.
- Inspect high-voltage connector X2 at the K10 Coolant Heater Control Module.
- Inspect the relevant high-voltage connectors and terminals for damage, arcing, or terminal damage.
13. Possible repair or resolution
- Not yet established by verified evidence. The supplied bulletin evidence provides inspection direction but is truncated before the complete correction or repair outcome is stated.
14. Affected vehicles
- Chevrolet Volt · 2016–2017 · US
15. Related TSBs / service bulletins
- PIC6266 / NHTSA Manufacturer Communication 10138162, published March 8, 2017. Applies to Chevrolet Volt model years 2016–2017 in North America according to the supplied evidence. It addresses Service Heater messages and, in some cases, P1AEF, P1AEE, check-engine lamp, no-start, or loss of propulsion associated with K10 Coolant Heater Control Module connector X2 seating and terminal condition.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Official source: NHTSA Manufacturer Communication PDF 10138162, Chevrolet PIC6266: https://static.nhtsa.gov/odi/tsbs/2017/MC-10138162-9999.pdf
19. Frequently asked questions
Which vehicles are covered by the supplied bulletin evidence?
The supplied evidence identifies 2016–2017 Chevrolet Volt vehicles in North America.
What component is identified in PIC6266?
The bulletin identifies high-voltage connector X2 at the K10 Coolant Heater Control Module.
Can P1AEF be associated with loss of propulsion?
Yes. The bulletin says that in some cases there may be a check-engine lamp with a no-start or loss of propulsion and additional DTCs P1AEE and P1AEF.
Should an owner inspect the high-voltage connector?
No. The bulletin calls for a high-voltage disable procedure before inspection; this should be handled by qualified EV service personnel.