2012 Jeep Grand Cherokee: Erratic electrical system wont start
Common wear/failure (not a recall)
Symptoms
Owners of the 2012 Grand Cherokee report: erratic electrical system wont start. CarComplaints.com lists 21 owner complaints, average mileage 48,550 miles.
NHTSA has 837 owner complaints for the 2012 Grand Cherokee in this area. Examples:
- NHTSA complaint ODI #11766856 (filed 09/25/2026): “The alternator failed. it was the safety recall p60 (nhtsa 14v-634) remedy alternator, installed by an authorized fca dealer when the recall was completed on 08/30/2021, as fca confirmed in writing. on 09/24/2026, at 41,275 miles, the vehicle had no electrica…”
- NHTSA complaint ODI #11763270 (filed 09/10/2026): “Alternator smoking. it is available for inspection. filled interior of vehicle with smoke the engine stopped running while driving. took to dealership for a 2nd sun visor recall and had them diagnose the smoking alternator. the voltage light came on just befor…”
Likely causes
Sources do not establish a single root cause; diagnosis is needed. Owner-reported fixes are listed below.
Fix, in plain English
Most common owner-reported solutions on CarComplaints.com: defective tipms (6 reports) engine shuts down while driving and doesn't start (2 reports) new timp switch (2 reports). Check for open recalls and extended warranty coverage with a dealer before paying out of pocket.
DIY difficulty: Moderate
Finding and splicing chewed wiring is doable with a multimeter and patience but can be time-consuming; harness replacement is pro work. (Our assessment.)
Cost
CarComplaints.com owners report a typical repair cost of about $1,300 (owner-reported average, not a quote).
Typical parts (search links, no affiliate codes)
AutoZone · O'Reilly · Advance · RockAuto