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Chevrolet P0AA1

17-NA-372 Service Procedure Refer toHigh Voltage Battery Disconnect Relay Replacement in SI. Parts Information Causal Part Description Part Number Qty x RELAY, HIGH VLTG BAT DISCON

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact a Chevrolet dealer or qualified GM EV service provider for diagnosis, particularly if P0AA1 remains current or returns after the bulletin's verification procedure.
Confidence95%

Quick answer

For a 2017 Chevrolet Bolt EV in the US, NHTSA-published GM bulletin 17-NA-372 addresses P0AA1. The bulletin directs a contactor-state cycling check and, if P0AA1 returns, replacement of the High Voltage Battery Disconnect Unit (BDU).

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 P0AA1 mean?

For a 2017 Chevrolet Bolt EV in the US, NHTSA-published GM bulletin 17-NA-372 addresses P0AA1. The bulletin directs a contactor-state cycling check and, if P0AA1 returns, replacement of the High Voltage Battery Disconnect Unit (BDU).

2. Technical explanation

Verified evidence links P0AA1 to GM bulletin 17-NA-372. The bulletin instructs technicians to cycle the vehicle 10 times with a 3–5 second delay between contactor state changes, monitor GDS 2 PID 430E (High Voltage Contactor Command Status) or listen for contactor operation, then turn the vehicle back on and check for DTCs. If no current DTCs are found, the bulletin says to return the vehicle to the customer. If P0AA1 or P0AA4 returns, it directs replacement of the High Voltage Battery Disconnect Unit (BDU). The cited service procedure is High Voltage Battery Disconnect Relay Replacement in GM Service Information.

3. What system is affected?

High-voltage battery disconnect unit / high-voltage battery disconnect relay.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

Not yet established by verified evidence.

6. Possible causes

  • The verified bulletin identifies a returning P0AA1 or P0AA4 as the condition for replacement of the High Voltage Battery Disconnect Unit (BDU). No further root cause is established by the supplied 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 by a qualified Chevrolet/GM EV service provider.
  • Do not attempt high-voltage battery disconnect relay or BDU repair yourself.
  • Provide the service provider with DTC P0AA1 and GM bulletin 17-NA-372.

10. Step-by-step troubleshooting

  1. GM bulletin 17-NA-372 directs technicians to cycle the vehicle 10 times, using a 3–5 second delay between contactor state changes.
  2. The bulletin directs monitoring GDS 2 PID 430E, High Voltage Contactor Command Status, or listening for contactor opening and closing to verify state changes.
  3. The bulletin then directs turning the vehicle back on and checking for DTCs.
  4. If no current DTCs are found, the bulletin says to return the vehicle to the customer.
  5. If P0AA1 or P0AA4 returns, the bulletin directs replacement of the High Voltage Battery Disconnect Unit (BDU).

11. When to contact service

Contact a Chevrolet dealer or qualified GM EV service provider for diagnosis, particularly if P0AA1 remains current or returns after the bulletin's verification procedure.

12. What the service center may check

  • Perform the contactor-state cycling and verification procedure described in GM bulletin 17-NA-372.
  • Check for current DTCs after the procedure.
  • If P0AA1 or P0AA4 returns, evaluate and replace the High Voltage Battery Disconnect Unit (BDU) as directed by the bulletin.

13. Possible repair or resolution

  • GM bulletin 17-NA-372 directs replacement of the High Voltage Battery Disconnect Unit (BDU) if P0AA1 or P0AA4 returns after the prescribed check.
  • The bulletin lists relay part number 24284564, described as RELAY, HIGH VLTG BAT DISCONNECT, quantity 1.

14. Affected vehicles

15. Related TSBs / service bulletins

  • GM/Chevrolet Bulletin 17-NA-372, published November 21, 2017; NHTSA Manufacturer Communication MC-10139138-9999. It applies in the supplied evidence to the 2017 Chevrolet Bolt EV, US.

16. Recall information

No recall relationship is established by verified evidence.

17. Official manufacturer information

Official source: NHTSA-hosted GM manufacturer communication 17-NA-372: https://static.nhtsa.gov/odi/tsbs/2017/MC-10139138-9999.pdf

19. Frequently asked questions

What does the verified bulletin say to do if P0AA1 returns?

GM bulletin 17-NA-372 directs replacement of the High Voltage Battery Disconnect Unit (BDU) if P0AA1 or P0AA4 returns after the prescribed contactor-state check.

Does this evidence apply to every Chevrolet vehicle?

No. The supplied applicability evidence identifies the 2017 Chevrolet Bolt EV in the US. Other applications are not yet established by verified evidence.

Is it safe to drive or charge with P0AA1?

Not yet established by verified evidence.

20. Sources & verification

ReferenceVerified
Chevrolet P0AA1: 17-NA-372 Service Procedure Refer toHigh Voltage… | EV Diagnostics