P0307 on Cadillac
Cylinder 7 Misfire Detected
P0307 on Cadillac vehicles indicates cylinder 7 misfire detected. Au7o has documented this code across 1 Cadillac model — most commonly on Escalade. P0307 means the engine computer detected a misfire on cylinder number 7 — that cylinder isn't burning its air/fuel mixture completely or at the right moment. The PCM senses this by watching for tiny slowdowns in crankshaft speed each time cylinder 7 should fire. A misfire wastes fuel, can dump raw fuel into the exhaust, and may damage the catalytic converter over time, which is why a persistent or severe misfire often makes the check engine light flash. You may feel rough idle, shaking, hesitation, or a loss of power. Typical repair costs on Cadillac range from $3,000 to $6,000, depending on the specific model and root cause.
Common Causes of P0307
- •Worn, fouled, or incorrectly gapped spark plug on cylinder 7
- •Failed ignition coil or coil-on-plug for cylinder 7
- •Faulty, clogged, or leaking fuel injector
- •Vacuum or intake air leak affecting that cylinder
- •Low compression (worn rings, burnt/leaking valve, head gasket)
- •Damaged spark plug wire or boot (on applicable engines)
- •Carbon buildup or sticking valve
P0307 on Cadillac by Model
Cadillac Escalade(1 issue)
- AFM/DOD Lifter Failure - V8 Cylinder Deactivation System2007-2020
The Escalade's 5.3L and 6.2L V8 engines with Active Fuel Management (AFM) / Dynamic Fuel Management (DFM) use collapsible hydraulic lifters to deactivate cylinders for fuel savings. These AFM lifters are prone to premature failure, causing misfires, rough running, and potential catastrophic engine damage from collapsed lifters. The issue is most common on cylinders 1, 4, 6, and 7 (the deactivation cylinders). Failed lifters can damage camshaft lobes, pushrods, and even score cylinder walls. This is arguably the most common and expensive Escalade issue, affecting 2007-2020 models with the Gen IV and Gen V V8.
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What does P0307 mean on Cadillac?▼
P0307 stands for "Cylinder 7 Misfire Detected." P0307 means the engine computer detected a misfire on cylinder number 7 — that cylinder isn't burning its air/fuel mixture completely or at the right moment. The PCM senses this by watching for tiny slowdowns in crankshaft speed each time cylinder 7 should fire. A misfire wastes fuel, can dump raw fuel into the exhaust, and may damage the catalytic converter over time, which is why a persistent or severe misfire often makes the check engine light flash. You may feel rough idle, shaking, hesitation, or a loss of power. On Cadillac specifically, this code is documented across 1 model.
What causes P0307 on Cadillac vehicles?▼
Common causes on Cadillac: Worn, fouled, or incorrectly gapped spark plug on cylinder 7, Failed ignition coil or coil-on-plug for cylinder 7, Faulty, clogged, or leaking fuel injector, Vacuum or intake air leak affecting that cylinder, Low compression (worn rings, burnt/leaking valve, head gasket). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0307 on a Cadillac?▼
Repair costs on Cadillac range from $3,000 to $6,000, depending on the specific model and root cause.
Which Cadillac models have P0307 documented?▼
Au7o has documented P0307 on 1 Cadillac model: Escalade.