OBD codes / P0301 / Chevrolet Silverado 1500
P0301 on a Chevrolet Silverado 1500
Cylinder 1 Misfire Detected
5.3L V8 with AFM/DoD (cylinder 1 is an AFM cylinder), plus 4.8L, 6.2L, and 4.3L.
What P0301 usually means on a Silverado 1500
P0301 isolates the misfire to cylinder 1, and on the AFM 5.3L Silverado that detail matters, because cylinder 1 is one of the four cylinders that deactivates under Active Fuel Management. A hard misfire on cylinder 1 with a ticking noise points toward a collapsed AFM lifter on that cylinder rather than a simple ignition part. On non-AFM engines or milder cases, it is more likely that cylinder's coil, plug, or injector. The presence or absence of a lifter tick is the key branch in the diagnosis.
Most likely causes on this model
- Collapsed AFM lifter on cylinder 1 (5.3L)
Cylinder 1 is an AFM cylinder, so a hard misfire there with a tick is a prime AFM-lifter suspect. This is internal mechanical failure, not an ignition issue.
- Failed coil or worn plug on cylinder 1
The ordinary single-cylinder misfire cause. Swap the coil to another cylinder to see if the misfire follows, and inspect the plug for fouling or wear.
- Oil-fouled plug from AFM oil consumption
On oil-consuming 5.3L engines, cylinder 1's plug can foul from burnt oil, misfiring until the consumption is addressed.
- Injector or compression issue on cylinder 1
A leaking injector or low compression (including a lifter that has damaged the cam lobe) produces a misfire that ignition parts will not cure; test compression to confirm.
What it costs on a Silverado 1500
If cylinder 1 just needs a coil and plug, it is an inexpensive fix. If it is a collapsed AFM lifter, you are into intake and valvetrain teardown, a four-figure job, and it is worth inspecting the camshaft lobe for that cylinder since a failed lifter can score it. Determining lifter versus ignition before disassembly is what protects your wallet.
Fixing it
Listen for a tick and check compression on cylinder 1 before buying ignition parts. If the coil and plug test fine and the cylinder is an AFM cylinder with a tick, plan for lifter work and inspect the cam lobe.
For the full step-by-step diagnosis order (any vehicle), see the main P0301 guide.
Year, engine and mileage change the answer. Get a diagnosis for your Silverado 1500 — it weighs these causes against your exact configuration and real complaint data.
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Based on widely reported patterns for this model; individual causes vary by year, engine and history. Generic P0301 behavior is covered on the main P0301 page. Confirm with a scan tool before buying parts.