P1600 on 2011-2016 Honda CR-Z — Loss of Keep Alive Memory (KAM) Power
1 vehicles · 1 makes · $1,000-$3,000 repair
How to diagnose and fix P1600: most-reported vehicles
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Honda CR-Z · 2011–2016
The CR-Z uses Honda Integrated Motor Assist (IMA) system with a nickel-metal hydride (NiMH) battery pack located behind the rear seats. The battery pack degrades over time, losing capacity and causing the IMA system to become less effective at assisting acceleration and regenerating energy. The battery management system can also lose its calibration, causing incorrect state-of-charge readings and frequent IMA warning lights. In severe degradation, the IMA system shuts down entirely, leaving the car running on the 1.5L engine alone.
Common Symptoms
- IMA warning light illuminated on dashboard
- Check engine light with IMA-related codes
- Battery gauge showing low charge constantly
- Reduced power assist during acceleration
- Auto-stop feature no longer working
- Fuel economy significantly worse than rated
How to Fix
Perform a battery recalibration (deep discharge and full recharge cycle) using a Honda diagnostic tool. If recalibration does not resolve the issue, replace the IMA battery pack — Honda OEM replacements are available, and aftermarket rebuilt packs cost $1,000-2,000 less. Companies like Bumblebee Batteries offer refurbished IMA packs with warranties. After battery replacement, reset the battery module ECU and allow the system to relearn over 2-3 drive cycles.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Best Hybrid Batteries remanufactured Honda CR-Z NiMH hybrid battery packOEMReplaces Honda 1D010-RBJ-305 / 1D010-RBJ-015 / 1D010-RBJ-025
Confirmed-pack-replacement branch after Honda product-update status and high-voltage diagnosis are completed Fitment/availability: 2011-2012 U.S. Honda CR-Z NiMH only; guaranteed fitment is explicitly limited to those years and VIN confi…
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Sources for this issue (1)
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P1600 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 P1600 mean?
P1600 stands for "Loss of Keep Alive Memory (KAM) Power." This manufacturer-specific code (common on Ford) means the engine computer lost its Keep Alive Memory (KAM) power, the constant battery feed that lets the PCM retain learned data such as fuel trims, idle, and transmission adaptive settings even when the key is off. An open circuit, weak battery, or recently disconnected battery can interrupt this feed and set the code. After it sets, the vehicle may idle or shift oddly until it relearns. It is usually a wiring, ground, or battery issue rather than a failed computer.
What are the most common causes of P1600?
The most common causes of P1600 are: Weak, discharged, or recently disconnected battery, Open or broken KAM power circuit wiring, Corroded or loose battery terminals or ground, Blown fuse feeding KAM power, Poor PCM connector contact, Faulty PCM (less common). The specific cause varies by vehicle.
How much does it cost to fix P1600?
Repair costs for P1600 range from $1,000 to $3,000, depending on the vehicle and root cause.
Which vehicles are affected by P1600?
Au7o has documented P1600 across 1 vehicle models from 1 manufacturers: Honda.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.