P0622: Generator Field/F Terminal Circuit
A generic powertrain (engine and transmission) trouble code, same meaning on every brand.
Yes with care - charging may be intermittent.
Symptoms
- Charging voltage unstable
- Battery light flickering
- Electrical accessories behaving oddly
Likely causes, most common first
- Alternator field circuit fault
- Worn brushes or slip rings inside the alternator
- Wiring or connector damage
- Failed regulator
Read P0622 yourself before paying for diagnosis
A basic Bluetooth OBD-II scanner ($20-40) plugs into the port under the dashboard and shows this code with live sensor data on your phone - useful both for confirming the fix and for talking to a shop from an informed position.
What is going on and how it gets diagnosed
P0622 reports a problem in the alternator field circuit - the winding whose current determines how much the alternator produces. A fault here usually shows up as charging voltage that wanders rather than as a complete failure.
Worn brushes are a common internal cause and produce a characteristic pattern: charging works normally most of the time and drops out over bumps or at certain engine speeds. Watching charging voltage on a scan tool during a road test catches that far better than a static test in the workshop.
Repair options and cost
Typical US independent-shop ranges, parts and labor. Dealers run higher; regional labor rates vary.
Owner reports mentioning P0622
“Low voltage light came on, lost all power on the highway.I had to hit the shoulder quickly. I then tested code with key (3 clicks off/on) got code p0622 and p2403..towed to a shop, to find out the wires from alternator to the computer shorted out, it's a known problem, wiring harness runs along cv shaft and rubs against a bolt near the frame, thus shorting out the charging system and burning out the computer. So now the bill for repairs are almost $650.00 and lucky we got off the highway in time, almost got hit by a semi cause we lost power so quick. I am glad we didn't get killed. If chrysler and the government knows this is a problem why is there no recall.....or a safety warning . *tr”2003 Chrysler PT Cruiser · Feb 2014 · 156,263 mi
Cars that report P0622 most often
Based on mentions of this code in NHTSA owner complaints.
Frequently asked questions
Can I drive with P0622?
Yes with care - charging may be intermittent.
How much does it cost to fix P0622?
Typical US repair costs range from $80 for the simplest fix (wiring repair) to $1,100 in the worst case. The right number depends on which cause your car has - see the causes list.
Related codes
The codes closest to P0622. They often appear together, and telling them apart is usually what narrows the diagnosis.
Definition per SAE J2012 standard nomenclature. Symptoms, causes and costs are editorial guidance - always confirm with a diagnosis of your specific vehicle.