Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P1602: Deterioration of Battery [12/2012 - ]: Description
The generator control ECU assembly monitors battery conditions. If the voltage drops below a certain value while the engine is running (not cranking), the generator control ECU assembly determines the battery is deteriorated and stores this DTC.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|---|---|---|---|---|
| P1602 | Deterioration of Battery | Battery capacity is abnormally low for 10 seconds or more when the engine is running (not cranking) (1 trip detection logic) |
|
Does not come on | DTC stored |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.