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Cadillac B1325

Cannot relearn TPM • Specific to Hybrids: – Reduced propulsion power message. – Service high voltage charging system message. Cause If nothing else can be identified as the root ca

DriveUnknown. The supplied diagnostic record marks safe-to-drive status as unknown. Because the bulletin associates B1325 with potentially erratic electric power-steering boost and, on hybrids, reduced-propulsion-power messaging, obtain professional assessment if these conditions are present.
ChargeUnknown. The supplied diagnostic record marks safe-to-charge status as unknown. The bulletin lists a Service High Voltage Charging System message for hybrids, but does not establish charging instructions for B1325.
ServiceService is advisable when B1325 is present with erratic steering assist, a TPM relearn concern, Reduced Propulsion Power, or Service High Voltage Charging System messaging. The supplied record does not establish whether service is mandatory in every case.
Confidence95%

Quick answer

B1325 is listed in Cadillac bulletin 13-08-116-001 revisions as potentially occurring with an illuminated Service Tire Pressure Monitoring (TPM) light and an inability to relearn TPM. The same bulletin lists hybrid-specific reduced-propulsion-power and Service High Voltage Charging System messages among possible concerns. The bulletin directs normal SI diagnostics first; if no root cause is identified, it directs checking for a device plugged into the vehicle’s data link connector (DLC).

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 B1325 mean?

B1325 is listed in Cadillac bulletin 13-08-116-001 revisions as potentially occurring with an illuminated Service Tire Pressure Monitoring (TPM) light and an inability to relearn TPM. The same bulletin lists hybrid-specific reduced-propulsion-power and Service High Voltage Charging System messages among possible concerns. The bulletin directs normal SI diagnostics first; if no root cause is identified, it directs checking for a device plugged into the vehicle’s data link connector (DLC).

2. Technical explanation

The supplied verified evidence does not establish a standalone, vehicle-specific definition for B1325 beyond its appearance in Cadillac/GM bulletin 13-08-116-001 revisions. In that bulletin, B1325 is listed among codes that may accompany erratic electric power-steering boost. The bulletin also lists an illuminated Service TPM light with inability to relearn TPM, and—specifically for hybrids—a Reduced Propulsion Power message and a Service High Voltage Charging System message. These are bulletin-listed possible concerns, not proof that every B1325 event will produce them. The bulletin states that normal diagnostics in SI should be performed first. If no other root cause can be identified, it calls for checking for a device plugged into the DLC. The supplied evidence does not establish the exact fault mechanism, a component failure, or a universal repair for B1325.

3. What system is affected?

Verified evidence associates B1325 with electric power-steering concerns in the bulletin. The bulletin also references the tire-pressure-monitoring system and, for hybrids, propulsion-power and high-voltage-charging warnings. A single definitive affected system is not yet established by verified evidence.

4. How serious is this code?

Unknown. The supplied diagnostic record marks severity as unknown.

5. Symptoms you may notice

  • Service Tire Pressure Monitoring (TPM) system light illuminated.
  • Cannot relearn TPM.
  • Erratic electric power-steering boost, potentially associated with B1325.
  • For hybrids: Reduced Propulsion Power message.
  • For hybrids: Service High Voltage Charging System message.

6. Possible causes

  • If normal SI diagnostics do not identify another root cause, bulletin 13-08-116-001 directs checking for a device plugged into the vehicle DLC.
  • Any additional cause for B1325 is not yet established by verified evidence.

7. Can I still drive the vehicle?

Unknown. The supplied diagnostic record marks safe-to-drive status as unknown. Because the bulletin associates B1325 with potentially erratic electric power-steering boost and, on hybrids, reduced-propulsion-power messaging, obtain professional assessment if these conditions are present.

8. Can I charge the vehicle?

Unknown. The supplied diagnostic record marks safe-to-charge status as unknown. The bulletin lists a Service High Voltage Charging System message for hybrids, but does not establish charging instructions for B1325.

9. What you can safely do

  • Record all warning messages and diagnostic trouble codes before they are cleared.
  • Use normal manufacturer SI diagnostics through a qualified service facility.
  • If no root cause is found through normal diagnostics, have the service facility inspect for a device connected to the DLC, as directed by bulletin 13-08-116-001.
  • Do not perform high-voltage system repairs yourself.

10. Step-by-step troubleshooting

  1. Perform normal diagnostics using Cadillac/GM Service Information (SI), as specified by the bulletin.
  2. If normal diagnostics identify no root cause, check for a device plugged into the DLC, per bulletin 13-08-116-001.
  3. The supplied evidence does not establish further diagnostic steps.

11. When to contact service

Service is advisable when B1325 is present with erratic steering assist, a TPM relearn concern, Reduced Propulsion Power, or Service High Voltage Charging System messaging. The supplied record does not establish whether service is mandatory in every case.

12. What the service center may check

  • Retrieve and document all stored DTCs and displayed messages.
  • Perform normal SI diagnostics first.
  • If no root cause is identified, inspect for a device connected to the DLC as specified in bulletin 13-08-116-001.

13. Possible repair or resolution

  • No specific repair is established by the supplied verified evidence.
  • Resolution should follow the result of normal SI diagnostics and the bulletin-directed DLC-device check when applicable.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Cadillac/GM bulletin 13-08-116-001I, published June 29, 2023; NHTSA manufacturer communication MC-10239102-0001.
  • Cadillac/GM bulletin 13-08-116-001H, published September 16, 2022; NHTSA manufacturer communication MC-10222776-0001.
  • Cadillac/GM bulletin 13-08-116-001G, published January 4, 2022; NHTSA manufacturer communication MC-10213767-9999.
  • Cadillac/GM bulletin 13-08-116-001F, published October 23, 2020; NHTSA manufacturer communication MC-10183782-9999.
  • Cadillac/GM bulletin 13-08-116-001E, published June 26, 2019; NHTSA manufacturer communication MC-10163272-9999.
  • Cadillac/GM bulletin 13-08-116-001C, published August 30, 2017; NHTSA manufacturer communication MC-10140298-9999.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Official NHTSA-hosted manufacturer communications supplied: https://static.nhtsa.gov/odi/tsbs/2023/MC-10239102-0001.pdf ; https://static.nhtsa.gov/odi/tsbs/2022/MC-10222776-0001.pdf

19. Frequently asked questions

What does B1325 mean on a Cadillac?

The supplied evidence does not establish a standalone definition. It establishes that B1325 is listed in Cadillac/GM bulletin 13-08-116-001 revisions among codes potentially associated with erratic electric power-steering boost.

Can B1325 be related to TPM relearn failure?

The bulletin lists an illuminated Service TPM light and inability to relearn TPM among possible concerns. It does not establish that B1325 alone proves a TPM fault.

Can B1325 be related to hybrid charging or reduced-power messages?

The bulletin lists Reduced Propulsion Power and Service High Voltage Charging System messages specifically for hybrids. It does not establish that every B1325 event causes either message.

What does the bulletin recommend?

Perform normal SI diagnostics first. If no root cause is identified, the bulletin directs checking for a device plugged into the DLC.

20. Sources & verification

Verified
Cadillac B1325: Cannot relearn TPM • Specific to Hybrids: – Reduced… | EV Diagnostics