OBD-II Code · Fuel & Air
P0283
Cylinder 8 Injector Circuit High
Severity
high
Left alone, this one tends to take other parts with it.
Can you drive it
Not for long
Driving on this one risks further damage. Get it to a shop rather than carrying on with it.
Indicative cost (USD)
$40–$510
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Cyl 8 injector open (rearmost V8 cylinder).
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Misfire cyl 8
- Check engine light
Likely causes
- Open windingMost common
- Connector backout
Read the full diagnostic procedureP0283 indicates the cylinder 8 injector control circuit is reading high (open) when it should be pulled low by the driver.
P0283 indicates the cylinder 8 injector control circuit is reading high (open) when it should be pulled low by the driver.
Cheapest test
swap injector 8 with a neighboring injector and clear codes. With the connector unplugged, ohm the injector: PFI 11 to 17 ohms, GDI 1.5 to 4 ohms; OL reading confirms a broken winding. Key-on engine-off, back-probe the connector: feed should read battery voltage, driver should rise to within 1V of battery through the injector coil if everything downstream is intact. Scope the driver line at crank and look for a clean ground pulldown under 1.0V at each command; missing pulldown means an open between the PCM and the injector, or a failed driver inside the PCM. Caveat: cylinder 8 is at the back of most longitudinal V8s and the harness routing often passes the firewall bulkhead grommet, so always inspect that grommet area before disassembling further; many shops replace coil packs first by mistake on V8s when both the coil and injector for cylinder 8 share routing.
Vehicle-specific patterns2003 to 2008 Dodge Ram 1500/2500 5.7L Hemi has a recurring cracked injector connector body fault on the rear cylinders, fixed with Mopar pigtail kit;…
- 2003to 2008 Dodge Ram 1500/2500 5.7L Hemi has a recurring cracked injector connector body fault on the rear cylinders, fixed with Mopar pigtail kit;
- 2005to 2009 Mustang GT 4.6L 3V has rear-bank harness chafe near the firewall heater pipe;
- 2007to 2013 Toyota Tundra 5.7L 3UR-FE rarely fails injectors but does have broken connector locking tabs after timing-cover service.
Estimated repair$40 to $510.
Look up another code
P0283 — frequently asked
What does a P0283 code mean?
Cyl 8 injector open (rearmost V8 cylinder).
What causes a P0283 code?
Common causes: Open winding; Connector backout.
What are the symptoms of a P0283 code?
Typical symptoms: Misfire cyl 8; Check engine light.
Is it safe to drive with a P0283 code?
Not for long. Driving on this one risks further damage. Get it to a shop rather than carrying on with it. Estimated repair: $40-$510.
How do I diagnose a P0283 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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