P3000 on Mitsubishi: How to Diagnose & Fix
Hybrid/High-Voltage Battery Control System Malfunction (Parent Code)
1 Mitsubishi model · 1 documented issue · $150-$600 repair
P3000 on Mitsubishi by model: symptoms, diagnosis and fix
Fourth-generation Outlander and Outlander PHEV owners (2022+) report the 12V auxiliary battery repeatedly going flat, sometimes leaving the car dead in a day or two, even on nearly new vehicles and with the traction battery fully charged. Identified culprits on owner forums include the OEM infotainment/radio head unit failing to fully sleep, a driver's seat control module intermittently drawing current, a WiFi/telematics module, and a charging logic that tops up the 12V battery on a fixed daily timer rather than by voltage - so a low battery may never recover. Distinct from the high-voltage traction-battery issues.
Common Symptoms
- Dead 12V battery / no-start after sitting 1-2 days
- No dash lights, vehicle won't power on
- Repeated battery replacements not fixing the drain
- Infotainment or seat module suspected of not sleeping
- Battery drains even shortly after full charge (PHEV)
How to Fix
Diagnose parasitic draw with a multimeter (fuse-pull method) to isolate the offending circuit; check for infotainment/seat-module software updates at the dealer. Replace a degraded 12V battery (vented AGM type on PHEV) and verify DC-DC/alternator charging. Some owners fit a battery maintainer for vehicles parked for extended periods. Dealers have addressed specific VINs with module reprogramming.
What you need to diagnose it
The fix here starts with a test, not a part — which repair you need depends on what the test finds.At least one code uses a manufacturer-specific format. No scanner recommendation is shown because family-level coverage cannot prove it can read that code.
UNI-T UT210E Low-Current DC Clamp Meter
1 mA resolution on the 2 A range — a 0.1 A meter reads a 50 mA drain as zero
$40–$70View
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Testing and isolating the fault is DIY work. Replacing or reprogramming a control module is not — most are VIN-programmed, so a new one does nothing until a shop codes it to your car. Check for an open recall or service bulletin before buying anything.
Sources for this issue (3)
P3000 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P3000 mean on a Mitsubishi?
P3000 stands for "Hybrid/High-Voltage Battery Control System Malfunction (Parent Code)." P3000 is a high-voltage battery malfunction code used mainly on hybrid vehicles (commonly Toyota and Lexus), set when the hybrid/battery control system detects an abnormality in the HV battery pack or its monitoring system. It is intentionally a generic 'parent' code — the specific fault (weak cell block, cooling problem, communication loss, contactor issue) is identified by accompanying sub-codes (INF codes). It can cause warning lights, reduced hybrid assist, or the vehicle refusing to enter Ready mode. Because it involves the high-voltage system, it is important and usually needs hybrid-capable diagnostic equipment. On Mitsubishi it is documented across 1 model: Outlander.
What are the most common causes of P3000?
The most common causes of P3000 are: Weak or degraded HV battery cell block/module, Battery cooling fan failure or blocked cooling airflow, Loss of CAN communication between battery ECU and hybrid ECU, Battery ECU / battery management system fault, Stuck contactor or insulation (leak/short) fault, Corroded or loose HV battery connections/bus bars, Aging high-mileage hybrid battery pack. The specific cause varies by vehicle.
How much does it cost to fix P3000 on a Mitsubishi?
Published repair estimates on Mitsubishi range from $150 to $600 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P3000 on a different make?
View P3000 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.