HPCM2 Requested MIL Illumination Indicator Code
The BOLT-P1E00 (Chevrolet Bolt EV HPCM2) EV fault code means: HPCM2 Requested MIL Illumination Indicator Code. This is a minor severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- P1E00 itself costs nothing to fix. It is a secondary indicator. The real repair cost depends entirely on the companion code. DIY clearing after a resolved minor fault is free. A BECM software update at a dealer runs $0 if covered under recall or roughly $150-$300 in labor if not. Battery module replacement under the recall is covered at no cost. Out-of-warranty battery repairs can range from $1,000 to $16,000 depending on scope.
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Common Symptoms
- Check Engine or MIL light illuminates on the instrument cluster
- Dashboard shows a 'Service Vehicle Soon' or 'Propulsion Power Reduced' message
- Vehicle may enter a reduced propulsion or limited power mode depending on the paired primary fault
- No other obvious drivability issue if the companion code is minor, or significant power loss if the companion code is serious
- GDS2 or a compatible scan tool shows P1E00 alongside at least one other active DTC
- Orange or yellow warning indicator lights up and stays on while driving
Probable Causes (Ranked by Likelihood)
- A primary BECM or HPCM2 fault code is present and triggered P1E00 as a secondary MIL request. P1E00 itself has no specific root cause and always accompanies another DTC. Very Likely
- Battery pack cell imbalance or temperature fault (such as P0A80, P1E00 is the MIL flag it raises) Likely
- Drive motor inverter or traction motor fault causing HPCM2 to request MIL illumination Likely
- High-voltage isolation fault or insulation resistance drop detected by BECM Possible
- CAN communication fault between HPCM2, BECM, and other high-voltage modules causing a cascading MIL request Possible
- Stale or incomplete software on HPCM2 or BECM following a module replacement or incomplete reprogram Less Likely
- Loose or corroded 12V battery connections causing temporary module dropouts that leave P1E00 stored Less Likely
Step-by-Step Diagnostic Procedure
Step 1. Do not treat P1E00 as a standalone fault. Your first job is to find the companion DTC. Connect GDS2, Autel MaxiSys, Foxwell NT530 with GM software, or BlueDriver with the Bolt-specific code database and pull ALL stored and pending codes from ALL modules, not just the powertrain summary. A generic OBD-II reader will miss GM-specific codes and give you an incomplete picture.
Step 2. Write down every DTC you find alongside P1E00. Sort them by module. Codes from BECM (Battery Energy Control Module) are the most critical to address first. Common companions include P0A80 (battery pack degradation), P0C73, P1E14, and various Uxxxx network codes.
Step 3. Check the 12V auxiliary battery voltage with a multimeter. A healthy 12V battery should read 12.4 to 12.7V at rest and 13.8 to 14.5V with the vehicle in READY mode. A weak 12V battery can cause module resets that generate spurious codes including P1E00.
Step 4. Inspect the 12V battery terminals and the main underhood fuse block for corrosion, loose connections, or signs of heat damage. Clean terminals with a wire brush if needed. A poor 12V ground is a known source of ghost codes on the Bolt platform.
Step 5. Check for any active GM Technical Service Bulletins (TSBs) or recall notices tied to your VIN, especially those related to the LG battery cell recall (NHTSA 21V-560 / GM 21277). If your vehicle is subject to an open recall, the BECM software may already be flagging a battery condition that must be addressed under warranty.
Step 6. Once you have identified the companion code or codes, look up each one individually. P1E00 will not clear on its own. It clears only after the root-cause DTC is diagnosed and resolved. Attempting to clear P1E00 alone will result in it returning on the next drive cycle.
Step 7. If no companion codes are present and P1E00 is the only DTC stored, use GDS2 to review BECM freeze-frame data and battery module voltage balance data. A single low-voltage cell group that momentarily triggered a code and then self-cleared can leave P1E00 behind. This scenario requires dealer-level investigation.
Step 8. If you cannot identify a companion code with a third-party scan tool, take the vehicle to a Chevy dealer or an independent shop with GDS2 access. Full BECM and HPCM2 data streams are only visible with dealer-level tooling and are essential for diagnosing what actually triggered P1E00.
Frequently Asked Questions
What does code P1E00 mean on a Chevrolet Bolt EV?
P1E00 means the HPCM2 has requested the MIL (check engine light) to turn on because another hybrid or EV system fault was detected. It is not a specific fault itself. Think of it as a messenger code. It always accompanies at least one other DTC that tells you what actually went wrong. You need to find and fix that companion code to resolve P1E00.
Can I still drive my Bolt with P1E00 active?
It depends entirely on what companion code triggered it. If the root fault is minor, such as a communication glitch or a logged cell imbalance that is not currently worsening, the vehicle may drive normally. If the companion code involves a serious battery or inverter fault, you may see reduced propulsion or a hard no-start. Check all stored codes before deciding whether to drive.
How much does it cost to fix P1E00?
P1E00 itself does not have a repair cost because it is a secondary indicator code. The cost comes from fixing whatever primary fault triggered it. If the root cause is covered under the LG battery recall (NHTSA 21V-560), the repair is free at any Chevy dealer. If it is an out-of-warranty software update, expect $150-$300 in labor. Hardware repairs to the battery pack or inverter can run much higher.
Will my Bolt start and drive normally after I clear P1E00?
Clearing P1E00 without fixing the companion code will only make the light disappear temporarily. The HPCM2 will detect the root fault again on the next drive cycle and set P1E00 again. Fix the underlying DTC first, then clear all codes. If no companion code is found and P1E00 keeps returning, you need dealer-level GDS2 access to review BECM battery module data for a condition that may not be obvious on a third-party scan tool.
Sources
This page is built from documented references. Verify against your own service info before repair work.