Symptoms of P0335
- A no-start or intermittent stalling.
- Hard starting or hesitation.
- Check-engine light.
Common causes of P0335
- A failed crankshaft-position sensor.
- Sensor wiring or connector faults.
- A damaged crank reluctor ring.
- Heat-related sensor dropout when hot.
Useful checks before replacing parts
- Check crank-sensor connector, power or reference feed, ground, signal circuit, and harness routing near heat or moving parts.
- Look for RPM signal during cranking and compare crank/cam synchronization data if available.
- Inspect sensor mounting, tone wheel or reluctor damage, and recent engine or transmission work.
How serious is P0335, and can you keep driving?
- Urgency
- High when the lamp is flashing
- Safe to drive?
- A flashing check-engine light means stop — a steady one means drive gently and get it looked at.
This is the one code family where the lamp itself tells you the urgency. A steady light means the misfire was detected and logged. A flashing light means it is happening right now and is severe enough to be dumping raw fuel into the catalytic converter, which can overheat and be destroyed in minutes rather than months. Pull over, switch off, and get the car recovered rather than driving it on. A converter costs many times what a coil or a plug does.
Clearing P0335, and making it stay gone
Clearing P0335 with a scan tool switches the lamp off; it does not fix anything, and it throws away the freeze-frame snapshot the car saved when the fault set. That snapshot is the most useful diagnostic evidence you have, because it records the load, RPM and temperature at the moment the test failed. Read it before you erase it.
Left alone, the lamp goes out on its own once the monitor that failed runs and passes on three consecutive driving cycles. The code stays in history after that, which is how a workshop can still see it. Disconnecting the battery is not a shortcut — it clears the stored codes and every learned fuel-trim value with them, so the car relearns from scratch and the underlying fault simply sets the code again.
On vehicles from roughly 2010 onward there is also a permanent DTC, which no scan tool can erase at all. It clears only when the monitor genuinely passes. That is deliberate: it stops a code being wiped in the car park outside an emissions test.
What P0335 costs to put right
There is no honest single figure for P0335, and any page that gives you one is guessing. The code names a circuit or a failed monitor, not a part — the same code can be a chafed wire, a connector full of water, or the component itself, and those are three very different bills.
The number worth budgeting for is diagnostic time. An hour of it is almost always cheaper than the second part you buy after the first one does not fix it, and parts fitted on a guess are rarely refundable once installed. If you are getting a quote, ask what the diagnosis found rather than what is being replaced — a ignition / misfire fault traced to a specific cause is a repair, and a list of parts is a hopeful shopping list.
Questions people ask about P0335
What does P0335 mean?
P0335 indicates a crankshaft-position sensor A circuit malfunction. Since crank signal is central to timing and RPM calculation, symptoms can include no-start, stalling, or misfire-like behavior.
Can I drive with P0335?
A flashing check-engine light means stop — a steady one means drive gently and get it looked at. This is the one code family where the lamp itself tells you the urgency. A steady light means the misfire was detected and logged. A flashing light means it is happening right now and is severe enough to be dumping raw fuel into the catalytic converter, which can overheat and be destroyed in minutes rather than months. Pull over, switch off, and get the car recovered rather than driving it on. A converter costs many times what a coil or a plug does.
What causes P0335?
The usual candidates are a failed crankshaft-position sensor; sensor wiring or connector faults; a damaged crank reluctor ring; heat-related sensor dropout when hot. The code tells you which test failed, not which of those did it — that is what the checks on this page are for.
Will P0335 clear itself?
Left alone, the lamp goes out on its own once the monitor that failed runs and passes on three consecutive driving cycles. The code stays in history after that, which is how a workshop can still see it. Disconnecting the battery is not a shortcut — it clears the stored codes and every learned fuel-trim value with them, so the car relearns from scratch and the underlying fault simply sets the code again.
Does P0335 mean I need to replace a part?
Do not replace the sensor without checking signal integrity and mechanical trigger condition; a damaged reluctor or wiring fault can set the same code.
How much does it cost to fix P0335?
There is no honest single figure for P0335, and any page that gives you one is guessing. The code names a circuit or a failed monitor, not a part — the same code can be a chafed wire, a connector full of water, or the component itself, and those are three very different bills.
Related OBD-II codes
These nearby ignition / misfire entries can help compare wording and pin down the fault area.