P065B on 2012-2014 Jeep Grand Cherokee (Laredo, Limited, Overland, Summit) — Generator Control Circuit Range/Performance
1 vehicles · 1 makes
How to diagnose and fix P065B: most-reported vehicles
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Jeep Grand Cherokee · 2012–2014
Grand Cherokees with electro-hydraulic power steering subject the alternator to cyclical electrical loads that cause thermal failure of the internal diodes. The alternator can fail suddenly, stalling the vehicle without warning and, in some cases, short-circuiting and causing an under-hood fire. Multiple NHTSA campaigns cover the 160/180/220-amp units.
Common Symptoms
- Sudden engine stall while driving
- Battery / charging warning light
- Dimming or flickering lights and dash warnings
- No-start or repeated dead battery
- Burning electrical smell from under the hood
How to Fix
Have the applicable recall performed (NHTSA 14V-634 for 160-amp 3.6L units, and 17V-435 for EHPS-equipped 5.7L/3.6L vehicles): dealers inspect and replace the alternator free of charge. Out of warranty, replace the alternator with an updated unit; budget roughly $400-$700 including labor.
Sources for this issue (3)
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P065B 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 P065B mean?
P065B stands for "Generator Control Circuit Range/Performance." Generic charging-system code. The engine control module commands the alternator (generator) through a control circuit and monitors the feedback; the values it sees do not match what it commanded. Charging output may be too high, too low, or erratic. Symptoms include a battery or charge warning light, dimming or flickering lights, and — if charging has genuinely failed — a flat battery and a vehicle that will not restart. Because it can end in a no-start, it should not be ignored.
What are the most common causes of P065B?
The most common causes of P065B are: Failing alternator or its internal voltage regulator, Open, shorted, corroded, or loose generator control/sense wiring or connector, Poor battery terminal or engine/body ground connections, Weak or failing battery producing out-of-range system voltage, Blown charging system fuse or fusible link, Engine control module fault (least common — verify wiring and alternator first). The specific cause varies by vehicle.
How much does it cost to fix P065B?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P065B?
Au7o has documented P065B across 1 vehicle models from 1 manufacturers: Jeep.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.