OBD-II Code · Ignition
P0357
Ignition Coil G Primary/Secondary Circuit
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)
$80–$300
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Coil pack 7 fault.
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 7
- Check engine light
Likely causes
- Failed coil 7Most common
- Wiring
Read the full diagnostic procedureP0357 is the cylinder 7 ignition coil primary/secondary circuit fault — this puts you on a V8, V10, or V12 (inline engines stop at 6 in this context).
P0357 is the cylinder 7 ignition coil primary/secondary circuit fault — this puts you on a V8, V10, or V12 (inline engines stop at 6 in this context).
Cylinder 7 location
on Ford Modular V8 it's bank 2 third position (driver side), on GM LS V8 it's bank 2 third position (passenger side), on Chrysler Hemi it's bank 2 third position (passenger side), on BMW V8 (N63/S63) it's bank 2 middle, on Mercedes M156/M157 V8 it's bank 2 middle. Cheapest-first diagnostic: swap the cylinder 7 coil with a known-good front-bank coil that uses the same part number, clear codes, drive cycle. Code follows coil = $35-$150 coil replacement (luxury V8 coils run higher). Code stays at cylinder 7 = trigger wire integrity check (ECM to coil under 0.5 ohms), B+ feed 12.0-12.6V static / 13.5-14.5V running, ground voltage drop under 0.1V. Scope the trigger pulse for clean ECM square-wave. On the deeper bank-2 cylinders of a Ford 5.4L or BMW N63, also inspect for valve-cover gasket oil intrusion into the plug well — oil-soaked boots arc to ground and throw coil-circuit codes that look like coil failure but are actually gasket failure first.
Vehicle-specific patterns2004-2010 Ford 5.4L 3V cylinder 7 P0357 — driver bank rear, same TSB 08-7-6 fix, hardest access on Expedition/Navigator.
- 2004-2010Ford 5.4L 3V cylinder 7 P0357 — driver bank rear, same TSB 08-7-6 fix, hardest access on Expedition/Navigator.
- 2005-2013GM 5.3L/6.0L LS truck cylinder 7 P0357 from D585 failure, swap to D514A; on 6.0L truck applications the rear coils run hotter due to tighter packaging.
- 2008-2013BMW N63 4.4L twin-turbo V8 cylinder 7 P0357 from Bosch coil failure — N63 has a service action covering coils, injectors, and valve stem seals as a package; one coil failure usually means the whole set is due.
- 2007-2011Mercedes M273 5.5L V8 cylinder 7 P0357 — coils fail in the heat-soaked rear bank position, and the M273 valve cover gasket leaks oil into the plug wells on high-mileage examples.
- 2005-2010Chrysler Hemi 5.7L/6.1L cylinder 7 (passenger bank third) P0357 from boot crack — Hemi runs two plugs per cylinder but one coil pair per coil, so a P0357 corresponds to the coil firing cylinder 7's primary plug; check the paired waste-spark cylinder too.
- 2008-2014Cadillac CTS-V/Escalade 6.2L LSA/L92 cylinder 7 P0357 — supercharged LSA runs hotter than naturally aspirated; OE coil only.
Estimated repair$35 (one coil) to $4,800+ (BMW N63 service action full package).
Look up another code
P0357 — frequently asked
What does a P0357 code mean?
Coil pack 7 fault.
What causes a P0357 code?
Common causes: Failed coil 7; Wiring.
What are the symptoms of a P0357 code?
Typical symptoms: Misfire cyl 7; Check engine light.
Is it safe to drive with a P0357 code?
Not for long. Driving on this one risks further damage. Get it to a shop rather than carrying on with it. Estimated repair: $80-$300.
How do I diagnose a P0357 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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