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P1570 is a manufacturer-specific Honda powertrain code used on Honda hybrid vehicles equipped with the IMA (Integrated Motor Assist) system, primarily the Honda Civic Hybrid. It means “Battery Module Individual Voltage Problem” and the key word is “individual.”
Unlike a code that flags overall pack performance, P1570 specifically identifies that one or more individual modules within the IMA battery pack are reading outside their acceptable voltage range. Honda’s IMA battery pack is made up of multiple NiMH (nickel-metal hydride) battery modules. The Battery Control Module (BCM) continuously monitors the voltage across every individual module. When any module’s voltage reading diverges significantly from the others — whether too low, too high, or unstable — the BCM logs P1570 and illuminates the IMA warning light.
How the sub-code works: P1570 almost always appears with a sub-code suffix. Most commonly “01” or “MOD01.” This sub-code identifies which specific module within the pack triggered the fault. A P1570 01 code means Module 1 is the problem. Different scan tools display this differently, but the sub-code is important diagnostic information: knowing which module is flagged tells a technician exactly where to start testing inside the pack.
The software update factor — important: Honda issued software updates for certain Civic Hybrid model years that can resolve P1570 codes generated by the MCM incorrectly interpreting battery data. Some P1570 codes on 2003–2006 Civic Hybrids are false positives caused by outdated software logic. Before any hardware work is recommended on those model years, confirming the IMA control software is current is the correct first step.
The deep discharge scenario: P1570 also has a non-degradation trigger that catches many Civic Hybrid owners off guard. If the vehicle sits unused for an extended period typically three or more weeks the IMA battery can discharge below the threshold the IMA system needs to begin charging it again. When this happens, the BCM sees a severe voltage imbalance across the modules (the most discharged cells reading near zero relative to others) and logs P1570. The battery itself may not be permanently damaged; it may need a specific reconditioning or external charging procedure to recover.
WARNING BOX: P1570 appearing alongside P0A7F (High Voltage Battery Capacity Serious Deterioration) is a more serious combination. When both codes are present simultaneously, they confirm both that individual modules have voltage problems and that overall pack capacity has deteriorated significantly. In this scenario, IMA battery replacement is almost always the appropriate repair — reconditioning or software updates are unlikely to resolve the underlying degradation.
Step 1 — Full Code Scan and Sub-Code Identification We pull every code stored and note the complete P1570 sub-code. P1570 01 and P1570 05 tell us very different things about where in the pack to look. We also check for companion codes like P0A7F appearing alongside P1570 changes the diagnostic path significantly.
Step 2 — Software Version Check For 2003–2006 Civic Hybrid models specifically, we confirm the IMA control software is current. An outdated calibration is a known source of false P1570 codes on those year ranges and is the cheapest possible fix, worth ruling out before any hardware testing.
Step 3 — 12V Battery and DC-DC Converter Check Before opening the IMA pack, we verify the 12V auxiliary battery is holding charge and the DC-DC converter is regulating properly. Either can trigger upstream voltage irregularities that appear as IMA module faults.
Step 4 — Deep Discharge Assessment If the vehicle has been sitting for an extended period, we assess whether the IMA battery fell below the charge recovery threshold. A pack in this state may read individual modules at severely low voltage without being permanently degraded. Reconditioning may be appropriate in this specific case.
Step 5 — Individual Module Voltage Testing We test each module in the IMA pack individually for voltage, capacity, and balance. This tells us whether the flagged module (identified by the sub-code) is a genuine outlier or whether the whole pack is declining together.
Step 6 — Honest Recommendation If the software, 12V system, and charge state all check out and one or more modules are genuinely degraded, we’ll tell you the pack needs replacement with a written quote and our Unlimited Mileage Warranty included. If reconditioning or a software update is appropriate, we’ll recommend that instead.
P1570 is specific to Honda IMA hybrid models:
Note: P1570 means something entirely different on other makes. On Volkswagen and Audi it relates to the immobilizer system. On Toyota and Lexus it indicates a radar sensor malfunction. On Subaru it flags an antenna fault. This page covers the Honda IMA hybrid interpretation only.
Like P1575, cost depends entirely on what’s actually causing the code.
If it’s a software update (select 2003–2006 models): Typically covered under a Honda TSB update — check with your dealer. If not covered, a software reflash at a dealer or specialist typically runs $100–$200.
If it’s the 12V auxiliary battery: $150–$300 for battery replacement.
If it’s the DC-DC converter: $400–$900 depending on parts and labor.
If it’s a deep discharge recovery: Reconditioning or grid charging procedures typically run $100–$300 at a hybrid specialist.
If it’s genuine IMA battery module degradation: IMA battery replacement is needed. Dealer pricing typically runs $2,000–$3,500 depending on model year and availability. Greentec Auto offers remanufactured IMA battery replacements at significantly lower pricing with our Unlimited Mileage Warranty included. Call 1 (800) 773-6614 for a free quote on your specific Honda model and year.
Q: What does P1570 mean on a Honda? A: P1570 on a Honda hybrid means “Battery Module Individual Voltage Problem.” The Battery Control Module has detected that one or more individual modules inside the IMA battery pack are reporting voltage outside the acceptable range — indicating imbalance, degradation, or an inability to hold charge relative to the rest of the pack. The accompanying sub-code (e.g., P1570 01) identifies which specific module triggered the fault.
Q: Is P1570 the same as P1575? A: No, they’re related but distinct. P1570 points directly at the individual battery modules inside the IMA pack, indicating a module-level voltage imbalance. P1575 points at the Motor Power Inverter module’s voltage interface. P1570 is more directly a battery code; P1575 is more of an inverter code that can be caused by battery problems. Both can appear on the same vehicle simultaneously.
Q: Can a software update fix P1570? A: On certain 2003–2006 Honda Civic Hybrid models, yes. Honda issued software updates that corrected MCM calibration issues known to generate false P1570 codes. Checking whether a software update applies to your vehicle is the correct first step before any hardware replacement is recommended.
Q: My car sat for a few weeks and now shows P1570 does that mean the battery is dead? A: Not necessarily. Honda IMA batteries can discharge below the level at which the IMA system can charge them back up after extended inactivity. This creates a severe voltage imbalance across the modules that triggers P1570 without the pack being permanently damaged. A proper deep-discharge assessment and reconditioning procedure is the right first step in this scenario.
Q: What does the sub-code on P1570 mean? A: The sub-code (P1570 01, P1570 MOD01, etc.) identifies which specific module within the IMA battery pack triggered the voltage fault. Module numbering corresponds to physical positions within the pack. Knowing the sub-code helps a technician test the specific module rather than the entire pack blindly.
Q: Does P1570 mean I need a new IMA battery? A: It depends on the cause. If software is current, the 12V system and DC-DC converter check out, the battery hasn’t been deeply discharged, and module testing confirms genuine cell degradation, then yes, IMA battery replacement is the appropriate fix. If any of those upstream causes apply first, address those before concluding the battery needs replacement.
Q: What happens if I ignore P1570? A: The IMA assist system operates in a compromised state your gas engine carries more of the load, fuel economy suffers, and continued cycling of degraded modules can accelerate damage to other cells in the pack. In severe cases, the vehicle can stall and lose electrical systems entirely if the IMA battery discharges past a critical point.
Q: Does this code appear on Toyota or Lexus hybrids? A: No. P1570 on Toyota and Lexus means radar sensor malfunction completely unrelated to the battery. P1570 as a battery code is specific to Honda’s IMA hybrid platform.
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