P0307 on a Chevrolet Silverado 1500
P0307 means cylinder 7 Misfire Detected. On the Silverado 1500, a few causes come up far more than others.
What P0307 usually means on a Silverado 1500
P0307 flags a misfire on cylinder 7, the last of the four AFM-deactivating cylinders on the 5.3L V8. A hard misfire on cylinder 7 accompanied by a ticking noise is a classic collapsed-AFM-lifter presentation, which is why these trucks so often show misfire codes on cylinders 1, 4, 6, and 7. Without a tick, or on non-AFM engines, the usual coil, plug, and injector suspects apply. Recognizing cylinder 7 as an AFM cylinder is central to diagnosing it correctly.
Most common causes on the Silverado 1500
- Collapsed AFM lifter on cylinder 7 (5.3L)
Cylinder 7 deactivates under AFM, so a hard misfire there with a tick strongly implicates a failed AFM lifter rather than an ignition part.
- Failed coil or worn spark plug on cylinder 7
The standard single-cylinder cause. Swap-test the coil and inspect the plug for wear or oil fouling.
- Oil-fouled plug from AFM oil consumption
Burnt oil on an AFM 5.3L can foul cylinder 7's plug, misfiring until the consumption is addressed.
- Injector or compression issue on cylinder 7
A leaking injector or low compression, including from a lifter-scored cam lobe, causes a misfire ignition parts will not fix; verify with compression testing.
What P0307 costs to fix on a Silverado 1500
A coil and plug for cylinder 7 is a low-cost repair; a collapsed AFM lifter is a major, four-figure valvetrain job that should include inspecting the cam lobe for that cylinder. Confirming lifter versus ignition before teardown is again the key to controlling cost.
Fixing it
Check for a tick and test compression on cylinder 7 first. If ignition parts are good and the cylinder is an AFM cylinder with a tick, plan for lifter replacement and inspect the camshaft.
For the full step-by-step diagnosis order (any vehicle), see the main P0307 guide.
Year, engine and mileage change the answer. Start a case and Redline weighs these causes against what your car shows, then names the check that would settle it.
Other codes on the Chevrolet Silverado 1500
Chevrolet Silverado 1500 problems & recalls by year
Based on widely reported patterns for this model; individual causes vary by year, engine and history. Generic P0307 behavior is covered on the main P0307 page. Confirm with a scan tool before buying parts.
P0307 on your Silverado 1500?
Every problem becomes a Case. Tell Redline what your Silverado 1500 is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
“Inner pad ~1 mm. Outer pad 3 mm.”
Next: check the slide pins move freely before buying parts.