2021 Jeep Wrangler MIL with DTCs P0607, P0C78
Owners of 2021 Jeep Wrangler vehicles may experience a Malfunction Indicator Lamp (MIL) illumination, accompanied by Diagnostic Trouble Codes (DTCs) P0607-00 (ECU Internal Performance) or P0C78-00 (Hybrid/EV Battery System Precharge Time Too Long). A software update for the Battery Pack Control…
Symptoms Owners May Notice
Owners of 2021 Jeep Wrangler vehicles might observe the Malfunction Indicator Lamp (MIL) illuminating on their dashboard. This warning light indicates that the vehicle's onboard diagnostic system has detected a fault.
Fault Codes (DTCs) Associated with This Issue
When investigating the MIL illumination, technicians may find one or both of the following Diagnostic Trouble Codes (DTCs) stored in the vehicle's system:
| Code | Description |
|---|---|
| P0607-00 | "ECU Internal Performance" |
| P0C78-00 | "Hybrid/EV Battery System Precharge Time Too Long" |
These codes point to specific issues within the vehicle's electronic control unit and hybrid battery system, leading to the Malfunction Indicator Lamp activation. If you are experiencing a Jeep Wrangler P0607 P0C78 issue, these are the codes to look for.
Diagnosis and Trigger Conditions
The primary trigger for this condition is the illumination of the Malfunction Indicator Lamp. This typically occurs when the Battery Pack Control Module (BPCM) detects an internal performance anomaly or an extended precharge time within the hybrid/EV battery system. These conditions are specifically identified by DTCs P0607-00 and P0C78-00.
Repair Procedure Summary
To resolve the MIL illumination and the associated DTCs, the manufacturer recommends updating the Battery Pack Control Module (BPCM) with the latest available software. This software update, detailed in the manufacturer communication "Flash: Battery Pack Control Module (BPCM) Diagnostic and System Update," is designed to correct the underlying logic causing the fault codes.
Owner Action
If your 2021 Jeep Wrangler is displaying the Malfunction Indicator Lamp or if you suspect issues related to the Jeep Wrangler P0607 P0C78 codes, it is recommended to visit an authorized Jeep dealership. The dealer will be able to diagnose the vehicle, confirm the presence of DTCs P0607-00 or P0C78-00, and perform the necessary BPCM software update. This update is typically covered under warranty if your vehicle is still within the applicable warranty period.
Source: NHTSA ID: 10248940
Frequently Asked Questions
- What does a Malfunction Indicator Lamp (MIL) mean in my 2021 Jeep Wrangler?
- A Malfunction Indicator Lamp (MIL) in your 2021 Jeep Wrangler indicates that the vehicle's diagnostic system has detected a fault. In this specific case, it's often related to internal ECU performance or the hybrid battery system, potentially triggering DTCs P0607-00 or P0C78-00.
- What are DTC P0607-00 and P0C78-00 in a Jeep Wrangler?
- DTC P0607-00 signifies an "ECU Internal Performance" issue, while P0C78-00 indicates a "Hybrid/EV Battery System Precharge Time Too Long." Both of these codes can cause the Malfunction Indicator Lamp to illuminate in your 2021 Jeep Wrangler.
- How is the Jeep Wrangler P0607 P0C78 issue resolved?
- The issue leading to DTCs P0607-00 and P0C78-00 in a 2021 Jeep Wrangler is resolved by updating the Battery Pack Control Module (BPCM) with the latest available software. This software update addresses the root cause of these fault codes.
- Should I take my Jeep Wrangler to the dealer for a MIL light with these codes?
- Yes, if your 2021 Jeep Wrangler has an illuminated MIL and you suspect DTCs P0607-00 or P0C78-00, you should take it to an authorized Jeep dealership. They have the necessary tools and software to perform the BPCM update and resolve the problem.
What Jeep Wrangler owners report
Counted from the records in our database across 41 model years.
- 18,838
- Owner complaints
- 104
- Recalls
- 2,758
- Service bulletins
- 572
- Crashes reported
- 552
- Fires reported
- 435
- Injuries reported
The 2021 model year
963 complaints, the 5th most of 41 model years on file. Owners reported 21 crashes, 27 fires and 15 injuries for this year, which also has 17 recalls on file.
Exterior Lighting, the system this article covers, accounts for 225 of 18,838 complaints (1%), including 6 for 2021.
Complaints by model year
| 2006 | 730 | |
|---|---|---|
| 2007 | 1,750 | |
| 2008 | 1,904 | |
| 2010 | 686 | |
| 2012 | 836 | |
| 2014 | 658 | |
| 2018 | 1,827 | |
| 2019 | 747 | |
| 2021 | 963 | |
| 2024 | 970 |
Most-reported systems
- Steering — 3,929
- Electrical System — 3,613
- Power Train — 2,470
- Engine — 2,406
- Fuel System — 2,015
Latest recalls for the 2021 model year
- 26V363000 — Steering (Jun 2026) — Park outside
- 25V741000 — Electrical System (Oct 2025) — Park outside
- 24V720000 — Electrical System (Sep 2024)
Recent owner reports about exterior lighting
The backup lights are no where near bright enough to safely backup at night. There is no easy way to upgrade the bulbs. This is a well know issue in the Jeep community with Wranglers.
Read owner complaints →JL Wrangler equipped with LED headlight and fog light. When drive in snowstorm, snow quickly cover up headlight and fog light due to not enough heat generated from headlight fog light.
Complaints are owner reports filed with NHTSA. They are unverified, and counts depend on how many vehicles were sold, so they are not a failure rate.
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