P0334
Fix within a few daysThe engine computer is receiving an inconsistent or erratic signal from the Crankshaft Position Sensor 'B' circuit.
Code P0334 means your engine computer is getting an erratic signal from the crankshaft position sensor. Common causes: Faulty CKP sensor (70%), wiring issues (25%). Drivability: Limit driving, fix within a few days. Repair cost: $50-$200 DIY, $150-$650 professional.
Can I Drive With P0334?
Limit driving, fix within a few days
Essential trips under 10 miles, avoid highways and heavy traffic due to risk of stalling.
Stop driving immediately if: Engine stalls repeatedly, significant power loss, or the Check Engine Light begins flashing.
Symptoms of P0334
- 1Check Engine Light is on
- 2Engine stalls unexpectedly
- 3Engine cranks but won't start
- 4Rough idle or engine misfires
- 5Reduced engine power or poor acceleration
- 6Engine hesitates or surges
Common Causes of P0334
Parts most likely causing this code, ranked by probability
The sensor itself has failed internally, sending an unreliable signal to the engine computer.
70% of P0334 cases are fixed by replacing this part
Damaged, corroded, or loose wiring or connectors in the CKP sensor circuit cause intermittent signal loss.
25% of P0334 cases are fixed by repairing wiring or connectors
A bent, damaged, or debris-covered reluctor wheel prevents the CKP sensor from getting an accurate reading.
5% of P0334 cases are fixed by addressing the reluctor wheel
Check These First (Before Buying Parts)
- Visually inspect the crankshaft position sensor's wiring harness for any obvious damage, fraying, or loose connections.
- Ensure the sensor's electrical connector is fully seated and free of corrosion.
- Clear the code with an OBD-II scan tool and see if it immediately returns or if symptoms persist.
How to Diagnose P0334
- 1Visually inspect the crankshaft position sensor and its wiring harness for any obvious damage, fraying, or loose connections.
- 2Check the sensor's electrical connector for corrosion or bent pins.
- 3If accessible, inspect the crankshaft reluctor wheel for damage or debris.
- 4Use a multimeter to test the CKP sensor's resistance and signal output according to your vehicle's service manual.
- 5Check for proper voltage supply and ground at the CKP sensor connector.
P0334 on Popular Vehicles
Honda Accord
2003-2024Crankshaft position sensor failures are common on these models, often causing intermittent starting issues or sudden stalling. Access can be challenging depending on the engine.
75% fixed by replacing the CKP sensor
Ford F-150
2004-2024P0334 on F-150s frequently indicates a failing CKP sensor. Wiring harness issues due to heat or vibration are also a factor, especially on higher mileage trucks.
65% fixed by replacing the CKP sensor
Toyota Camry
2007-2024While less common than on some other makes, P0334 on a Camry usually points to the CKP sensor itself. Wiring integrity should be thoroughly checked, as Toyota harnesses are generally robust.
70% fixed by replacing the CKP sensor
Frequently Asked Questions
What does P0334 mean?
P0334 indicates that the engine's computer has detected an intermittent or erratic signal from the 'B' circuit of the crankshaft position sensor. This sensor is crucial for determining engine speed and piston position.
Can I drive with P0334?
Limit driving, fix within a few days. An erratic crankshaft position sensor signal can cause your engine to stall unexpectedly, which is a significant safety hazard. It can also lead to no-start conditions.
Will P0334 clear itself?
No, P0334 will not clear itself. This code points to a hard fault with a critical sensor or its circuit. The underlying issue must be diagnosed and repaired before the code will clear, either manually with a scan tool or after several drive cycles once the problem is resolved.
How do I fix P0334 myself?
Start by visually inspecting the crankshaft position sensor and its wiring for damage. If the wiring looks good, replacing the crankshaft position sensor is the most common fix. Ensure the new sensor is correctly installed and the connector is secure.
How much does it cost to fix P0334?
DIY repair costs for P0334 typically range from $50 to $200 for a new crankshaft position sensor. Professional repair at a shop will cost between $150 and $650, including parts and labor.
P0334 keeps coming back - why?
If P0334 keeps returning, it's likely due to an undiagnosed wiring issue (frayed wire, poor connection), a damaged reluctor wheel that the sensor reads, or a rare engine computer problem. A thorough electrical diagnosis is necessary.
Will P0334 fail emissions/smog test?
Yes, P0334 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on is an automatic failure in most jurisdictions, and an erratic CKP signal can also affect engine performance and emissions output.
What's the difference between P0334 and P0335?
P0334 indicates an 'intermittent/erratic' signal from the crankshaft position sensor 'B' circuit, meaning the signal is inconsistent. P0335 indicates 'no signal' from the crankshaft position sensor 'A' circuit, meaning the computer isn't receiving any signal at all.
P0334 on Honda Accord?
On many Honda Accord models, P0334 often points directly to a failing crankshaft position sensor. These sensors are known to become erratic with age, leading to stalling or no-start conditions. Inspecting the wiring is still important, but the sensor itself is the prime suspect.
Questions to Ask Your Mechanic
Did you test the crankshaft position sensor's signal output with an oscilloscope?
Good answer: Yes, the waveform showed significant dropouts/spikes, confirming an erratic signal from the sensor itself.
Did you check the wiring harness for continuity and resistance from the sensor to the PCM?
Good answer: Yes, I checked the wiring for opens, shorts, and excessive resistance, and the circuit is good. The problem is definitely the sensor.
Repair Cost Estimate
DIY Repair
Parts only
$50-$200
Shop Repair
Parts + labor
$150-$650
Save $100-$450 by doing it yourself
Difficulty
intermediate
Time
1-3 hours
Intermediate - requires basic hand tools, an OBD-II scan tool, and potentially a multimeter for accurate diagnosis. Access to the sensor can be difficult on some vehicles.
Cost of Waiting
Ignoring P0334 can lead to your engine stalling unexpectedly, creating dangerous driving conditions. Continued erratic signals can also cause misfires, potentially damaging your catalytic converter, which is an $800-$2,500 repair. A $50-$200 sensor replacement now prevents a much larger bill and ensures your safety.
While You're In There...
If the CKP sensor is located near the crankshaft seal and requires significant disassembly to access, replacing the seal can prevent future oil leaks and repeat labor.
Tools You'll Need
- OBD-II Scan Tool
- Socket Set
- Wrenches
- Multimeter
- Wire Strippers/Crimpers (if wiring repair needed)
- Flashlight
P0334 is a common engine code that points to a critical but usually straightforward sensor issue. Most repairs are under $200 for parts, and your engine will run reliably again once fixed.
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Your Next Steps
Step 1: Perform a thorough visual inspection of the crankshaft position sensor and its wiring. Look for any signs of damage, corrosion, or loose connections.
Step 2: If the visual inspection doesn't reveal an obvious issue, use a multimeter to test the sensor's resistance and signal output. Compare readings to your vehicle's service manual specifications.
Step 3: If the sensor tests faulty or the wiring is damaged, you'll likely need a new crankshaft position sensor or a wiring repair kit.