P0300 on a 2017 Ford Explorer
Random or Multiple Cylinder Misfire
P0300 on a 2017 Ford Explorer indicates random or multiple cylinder misfire. Stop driving and diagnose it before continuing — it can signal an unsafe condition. The most common cause is worn or fouled spark plugs (all cylinders due for replacement) (typically $60–$350). Confirm the root cause before replacing parts.
What does P0300 mean on a 2017 Ford Explorer?
P0300 is set when the engine control module's misfire monitor detects that combustion is failing in more than one cylinder, or that misfires are occurring randomly across cylinders rather than being isolated to a single one. The misfire monitor works by measuring tiny variations in crankshaft rotational speed — a missed combustion event causes the crankshaft to decelerate by a detectable amount. When the ECM cannot attribute the event to a single cylinder, it sets P0300.
This guide covers P0300 across the 2015-2019 Ford Explorer generation — the symptoms, causes, and diagnostic steps below apply to every model year from 2015 through 2019.
Is it safe to drive a 2017 Ford Explorer with P0300?
No. P0300 is a high-severity code on the 2017 Ford Explorer — avoid driving until it is diagnosed and repaired, as it can indicate an unsafe condition or risk further damage.
What are the symptoms of P0300 on a 2017 Ford Explorer?
- Check Engine Light flashing (severe misfire) or steady (minor misfire)
- Rough idle and noticeable engine shake at a stop
- Hesitation or stumble under load
- Loss of power, especially at higher RPM or on hills
- Reduced fuel economy
- Smell of raw fuel from the exhaust
- Possible catalytic converter damage with prolonged operation
What causes P0300 on a 2017 Ford Explorer?
| Cause | Likelihood | Estimated repair (USD) |
|---|---|---|
| Worn or fouled spark plugs (all cylinders due for replacement) Especially common past 80,000 miles on platinum or iridium plugs. | Most common | $60–$350 |
| Failing ignition coils — coil-on-plug systems | Most common | $80–$600 |
| Vacuum leak causing lean misfire across all cylinders | Common | $80–$500 |
| Low fuel pressure (weak pump, clogged filter) | Common | $80–$900 |
| Clogged or leaking fuel injectors | Occasional | $150–$1,500 |
| Carbon-fouled intake valves (direct-injection engines) | Occasional | $400–$900 |
| Low engine compression (worn rings, burnt valve, head gasket) | Rare | $1,500–$5,000 |
| Failed crankshaft or camshaft position sensor causing timing issues | Rare | $150–$550 |
How to diagnose this on a 2017 Ford Explorer
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Pull every code, including pending and freeze-frame data
Read all stored, pending, and permanent codes. Note which cylinder(s) show misfire counts in mode 6 or the manufacturer-specific misfire PID. Freeze-frame data tells you the engine load, RPM, and temperature when the misfire occurred — critical for narrowing down the cause.
Tools: Scan tool with mode 6 / misfire counters
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Swap ignition coils between cylinders
On a coil-on-plug system, move the coil from a suspect cylinder to a known-good cylinder. Clear codes, drive, and re-read. If the misfire follows the coil, the coil is bad. If it stays in the same cylinder, the coil is not the cause.
Tools: Socket set, Torque wrench (for plug torque on reassembly)
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Inspect spark plugs visually
Remove all spark plugs. Compare their appearance. A black, sooty plug indicates a rich condition for that cylinder. A wet, fuel-smelling plug means no spark or no compression on that cylinder. White or blistered ceramic indicates an overly lean condition. Replace the full set if any are out of spec or past service interval.
Tools: Spark plug socket, Extension and ratchet, Anti-seize and torque wrench
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Test fuel pressure under load
Connect a fuel pressure gauge and observe pressure at idle, snap-throttle, and steady cruise. A weak pump may hold pressure at idle but drop under load — the time pattern matters as much as the absolute reading.
Tools: Fuel pressure gauge
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Perform a cylinder compression or relative-compression test
If misfires persist after ignition and fuel system work, perform a compression test on each cylinder, or use a scan tool's relative compression function. Cylinders more than 15 % below the rest indicate a mechanical problem (rings, valves, or head gasket).
Tools: Compression tester, Scan tool with relative compression
NHTSA complaints & recalls for the 2017 Ford Explorer
Owner-reported safety complaints and official recalls filed with the U.S. National Highway Traffic Safety Administration for the 2017 Ford Explorer. Use these to gauge how common a problem is on your specific vehicle before you start chasing Ford Explorer diagnostics.
- ENGINE 232
- POWER TRAIN 120
- ENGINE AND ENGINE COOLING 76
- STRUCTURE 633
- UNKNOWN OR OTHER 366
13 active recalls
- SEATS Sep 2019
Ford Motor Company (Ford) is recalling certain 2017 Ford Explorer vehicles equipped with power front seats. The seat frames may have sharp edges.…
NHTSA campaign 19V651000 - SUSPENSION:REAR Jun 2019
Ford Motor Company (Ford) is recalling certain 2011-2017 Explorer vehicles. The rear suspension toe links may fracture due to stress on the rear suspension.…
NHTSA campaign 19V435000 - WHEELS:HUB Aug 2017
Ford Motor Company (Ford) is recalling certain Wheel Hub Bearing assemblies, part number HB5Z-1104-C, incorrectly listed as being for installation on the rear axles of 2011-2017 Ford Explorer 4X2 vehicles. These bearings assemblies were manufactured without a self retention feat…
NHTSA campaign 17E048000 - STEERING Aug 2017
Ford Motor Company (Ford) is recalling certain 2017 Explorer, Taurus and Police Interceptor Utility and Sedan vehicles. The steering gear heat shield fasteners may corrode, allowing the heat shield to detach.…
NHTSA campaign 17V530000
How do I fix P0300 on a 2017 Ford Explorer?
- Replace all spark plugs as a set with the OEM-specified part
- Replace failed ignition coil(s)
- Repair any vacuum leaks found by smoke test
- Replace fuel pump, fuel filter, or pressure regulator
- Walnut-blast intake valves (carbon buildup, direct-injection engines)
- Replace failed crankshaft or camshaft sensor
About the 2015-2019 Ford Explorer
The 2015-2019 Ford Explorer was commonly sold with the following powertrains: 2.3L EcoBoost I4, 3.5L V6, 3.0L EcoBoost V6. Common trims include Base, XLT, Limited, ST, Platinum.
Is it safe to drive with a P0300?
If the Check Engine Light is flashing, no — pull over and tow the vehicle. A flashing light means raw fuel is reaching the catalytic converter, where it will combust and destroy the substrate within minutes. Replacement catalysts are $600–$2,400. Driving home is not worth that risk.
If the light is steady, the misfire is intermittent or minor. The vehicle can usually be driven short distances to a repair shop, but every mile adds risk of catalyst damage.
Why P0300 with no cylinder-specific code is harder to diagnose
P0301 through P0308 narrow the problem to a single cylinder. P0300 alone means the misfire is jumping cylinders or affecting all of them — which points to a systemic cause: ignition system, fuel system, vacuum, or mechanical. Always start with mode 6 misfire counts to see if any cylinder is statistically worse, even if no per-cylinder code has matured yet.
When to suspect compression vs. ignition vs. fuel
| Symptom pattern | Likely root cause |
|---|---|
| Cold start misfire that clears warm | Carbon-fouled valves or worn plugs |
| Misfire only under load | Weak ignition coils or low fuel pressure |
| Misfire only at idle | Vacuum leak or dirty injectors |
| Misfire on the same cylinder despite coil/plug swap | Compression problem (valve or rings) |
| Random multi-cylinder misfire after fuel-up | Bad fuel |
P0300 on a 2017 Ford Explorer: frequently asked questions
What does diagnostic trouble code P0300 mean on a 2017 Ford Explorer?
P0300 is set when the engine control module's misfire monitor detects that combustion is failing in more than one cylinder, or that misfires are occurring randomly across cylinders rather than being isolated to a single one. The misfire monitor works by measuring tiny variations in crankshaft rotational speed — a missed combustion event causes the crankshaft to decelerate by a detectable amount. When the ECM cannot attribute the event to a single cylinder, it sets P0300.
What are the symptoms of P0300 on a 2017 Ford Explorer?
Check Engine Light flashing (severe misfire) or steady (minor misfire). Rough idle and noticeable engine shake at a stop. Hesitation or stumble under load. Loss of power, especially at higher RPM or on hills. Reduced fuel economy. Smell of raw fuel from the exhaust. Possible catalytic converter damage with prolonged operation
What causes P0300 on a 2017 Ford Explorer?
Worn or fouled spark plugs (all cylinders due for replacement) (most-common). Failing ignition coils — coil-on-plug systems (most-common). Vacuum leak causing lean misfire across all cylinders (common). Low fuel pressure (weak pump, clogged filter) (common). Clogged or leaking fuel injectors (occasional). Carbon-fouled intake valves (direct-injection engines) (occasional). Low engine compression (worn rings, burnt valve, head gasket) (rare). Failed crankshaft or camshaft position sensor causing timing issues (rare)
Is it safe to drive a 2017 Ford Explorer with P0300?
No. P0300 is a high-severity code on the 2017 Ford Explorer — avoid driving until it is diagnosed and repaired, as it can indicate an unsafe condition or risk further damage.