Cadillac P1E00
Hybrid/Electric Vehicle Powertrain Control Module 2 Requested Malfunction Indicator Lamp Illumination Cause GM Engineering is attempting to determine the root cause of the above co
Quick answer
For certain U.S. 2023–2024 Cadillac LYRIQ vehicles, DTC P1E00 is documented in GM information-gathering communications with a malfunction indicator lamp, A/C not blowing cold air, or intermittent A/C operation. GM stated it was still determining the root cause.
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 P1E00 mean?
For certain U.S. 2023–2024 Cadillac LYRIQ vehicles, DTC P1E00 is documented in GM information-gathering communications with a malfunction indicator lamp, A/C not blowing cold air, or intermittent A/C operation. GM stated it was still determining the root cause.
2. Technical explanation
The verified GM/NHTSA communications identify P1E00 as “Hybrid/Electric Vehicle Powertrain Control Module 2 Requested Malfunction Indicator Lamp Illumination.” In the documented condition, technicians may find P1E00 and/or P0534 (A/C Refrigerant Charge Low). The communications were issued to obtain vehicle information before repair while GM Engineering investigated the condition.
3. What system is affected?
Hybrid/Electric Vehicle Powertrain Control Module 2 is named by the DTC description. The verified communications also document possible HVAC/A/C performance concerns. A specific failed component or root cause is not yet established by verified evidence.
4. How serious is this code?
Unknown. The supplied verified evidence does not assign a severity level.
5. Symptoms you may notice
- Malfunction Indicator Lamp illuminated on the Driver Information Center (DIC).
- A/C or HVAC may not blow cold air.
- A/C or HVAC may work intermittently.
6. Possible causes
- GM Engineering stated that it was attempting to determine the root cause.
- No specific component, leak, electrical fault, software issue, or other cause is established by the supplied 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 with a Cadillac dealer or qualified service provider, particularly if the malfunction indicator lamp is illuminated or A/C performance is affected.
- Provide the dealer with the stored DTCs and the observed HVAC/A/C symptoms.
- Do not attempt high-voltage system diagnosis or repair based on this information.
10. Step-by-step troubleshooting
- Have a service facility retrieve and document diagnostic trouble codes.
- For applicable vehicles, ask the dealer to review GM information-gathering communication PIE0759B or the earlier PIE0759 before repairs, because GM requested information from vehicles exhibiting this condition prior to repair.
- Further owner-performed troubleshooting is not established by the supplied verified evidence.
11. When to contact service
Contact a Cadillac dealer or qualified service provider for diagnosis. The verified GM communications directed U.S. dealers to gather information before repair for vehicles exhibiting the documented condition.
12. What the service center may check
- Confirm whether P1E00 and/or P0534 is stored.
- Document the malfunction indicator lamp condition and any A/C/HVAC cooling or intermittent-operation concern.
- For applicable vehicles, gather the information requested by GM Engineering before repair, consistent with PIE0759B or PIE0759.
13. Possible repair or resolution
- A final repair resolution is not established by the supplied verified evidence.
- GM Engineering was gathering pre-repair information to determine the root cause.
14. Affected vehicles
- Cadillac LYRIQ · 2023–2024 · US
15. Related TSBs / service bulletins
- PIE0759B, published November 16, 2023: U.S. dealer information-gathering communication for certain Cadillac LYRIQ vehicles with the documented condition; NHTSA Manufacturer Communication 10246290.
- PIE0759, published September 5, 2023: earlier U.S. dealer information-gathering communication; NHTSA Manufacturer Communication 10243721.
16. Recall information
- No recall information is supplied in the verified evidence.
17. Official manufacturer information
NHTSA-hosted GM communication PIE0759B: https://static.nhtsa.gov/odi/tsbs/2023/MC-10246290-0001.pdf
19. Frequently asked questions
What does P1E00 mean in the supplied Cadillac information?
It is identified as “Hybrid/Electric Vehicle Powertrain Control Module 2 Requested Malfunction Indicator Lamp Illumination.”
Which vehicles are covered by the supplied evidence?
Cadillac LYRIQ model years 2023–2024, U.S. region, with the supplied applicability confidence of 0.95.
Can P1E00 be associated with A/C issues?
Yes. The verified GM communications list a malfunction indicator lamp, A/C/HVAC not blowing cold air, and intermittent A/C/HVAC operation as possible customer comments in the documented condition.
Is the root cause known?
No. GM stated that Engineering was attempting to determine the root cause and requested information before repair.
Is it safe to drive or charge?
Not yet established by verified evidence.