P0319
Fix within a few daysIndicates a problem with the engine's misfire detection system or a rough road sensor, which helps the computer accurately identify misfires. This code does NOT mean your engine has 19 cylinders or a misfire on cylinder 19.
Code P0319 means your engine's misfire detection system or rough road sensor has a fault. Common causes: Crankshaft Position Sensor (40%), Rough Road Sensor (30%), PCM fault (15%). Drivability: Yes, safe to drive, but fix soon. Repair cost: $100-$400 DIY, $200-$800 professional.
Can I Drive With P0319?
Yes, safe to drive
No restrictions, but monitor for actual misfire symptoms.
Stop driving immediately if: Flashing Check Engine Light (indicating active misfires), significant power loss, loud engine noises, or a burning smell.
Symptoms of P0319
- 1Check Engine Light is on
- 2No noticeable driving symptoms (engine runs normally)
- 3Engine misfires that are not accompanied by a P030X code (if the detection system is faulty)
- 4Rough idle or hesitation (less common, but possible if a real misfire is masked)
Common Causes of P0319
Parts most likely causing this code, ranked by probability
The CKP sensor is critical for the engine computer to detect misfires by monitoring crankshaft speed variations. A faulty sensor or its wiring can cause misfire detection errors.
40% of P0319 cases are fixed by replacing the CKP sensor or repairing its circuit
Many vehicles use a rough road sensor (or accelerometer) to distinguish between engine misfires and vibrations caused by driving over rough terrain. A fault here can lead to incorrect misfire reporting.
30% of P0319 cases are fixed by replacing the rough road sensor or repairing its circuit
The PCM is responsible for interpreting sensor data and setting misfire codes. A software glitch or internal hardware failure can cause this code.
15% of P0319 cases are fixed by PCM repair or replacement
Some generic or inexpensive scan tools may incorrectly display P0319, especially if it's a manufacturer-specific code they don't fully support. The actual code might be different.
10% of P0319 cases are resolved by using a professional scan tool to confirm the actual code
Damaged, corroded, or loose wiring to the CKP sensor, rough road sensor, or PCM can disrupt signals, leading to misfire detection system faults.
5% of P0319 cases are fixed by repairing wiring harness issues
Check These First (Before Buying Parts)
- Use a professional-grade scan tool to confirm P0319 and check for any other related codes (P0300, P0335). Generic scanners can sometimes misinterpret manufacturer-specific codes.
- Visually inspect the wiring harness and connectors for the Crankshaft Position Sensor (CKP) and, if present, the Rough Road Sensor. Look for any signs of damage, fraying, corrosion, or loose connections.
How to Diagnose P0319
- 1Verify the code with a professional-grade scan tool to ensure it's not a misinterpretation by a generic scanner.
- 2Check for any other related misfire codes (P0300, P0301-P0312) or CKP sensor codes (P0335, P0336).
- 3Inspect the Crankshaft Position Sensor (CKP) and its wiring for any visible damage, corrosion, or loose connections.
- 4If equipped, locate and inspect the Rough Road Sensor (often mounted on the firewall or frame) and its wiring for damage.
- 5Use a scan tool to monitor CKP sensor live data (RPM signal) and rough road sensor data (if available) while driving to check for erratic readings.
- 6Perform a wiggle test on the CKP and rough road sensor connectors and wiring while monitoring live data to identify intermittent connections.
- 7If all sensors and wiring appear good, consider a PCM software update or further PCM diagnostics by a specialist.
P0319 on Popular Vehicles
Ford F-150
2004-2024On Ford trucks, P0319 is frequently linked to the Rough Road Sensor (RRS) or the misfire monitor's performance. The RRS is crucial for preventing false misfire detections due to road vibrations. Check the RRS and its wiring first.
60% fixed by Rough Road Sensor replacement or wiring repair
Chrysler/Dodge
2003-2024For Chrysler and Dodge vehicles, P0319 can indicate a general misfire detection system malfunction, often related to the Crankshaft Position Sensor (CKP) signal integrity or the PCM's internal misfire monitoring logic. Focus on CKP sensor diagnostics and verifying PCM software.
55% fixed by CKP sensor replacement or PCM update
Honda Accord
2003-2024P0319 is less common on Honda vehicles as a specific misfire detection code. If it appears, it's often a generic scan tool misinterpretation of another code, or it points to a very subtle issue with the CKP sensor signal that affects misfire monitoring. Always re-scan with a Honda-specific tool.
40% fixed by using a professional scan tool to confirm the actual code
Frequently Asked Questions
What does P0319 mean?
P0319 indicates a problem with your vehicle's misfire detection system or a rough road sensor. This code does not mean your engine has 19 cylinders or a misfire on cylinder 19; it's a manufacturer-specific code often related to how the engine computer monitors for misfires.
Can I drive with P0319?
Yes, you can drive safely, but fix this within a few days. The primary concern is that if the misfire detection system is faulty, real engine misfires might go undetected, potentially leading to more severe engine damage or catalytic converter failure if ignored.
Will P0319 clear itself?
No, P0319 will not clear itself. The engine computer stores this code until the underlying issue with the misfire detection system or sensor is resolved and the system passes its self-test. You will need to diagnose and fix the problem, then clear the code with a scan tool.
How do I fix P0319 myself?
Start by verifying the code with a reliable scan tool. Inspect the Crankshaft Position Sensor (CKP) and its wiring, and if your vehicle has one, the Rough Road Sensor and its wiring for damage or loose connections. Replacing a faulty CKP sensor or rough road sensor is a common DIY fix once the problem is identified.
How much does it cost to fix P0319?
DIY repair costs for P0319 typically range from $100-$400, mainly for a new Crankshaft Position Sensor ($50-$200) or Rough Road Sensor ($50-$250). Professional shop costs range from $200-$800, including diagnosis and labor, with potential higher costs if a PCM replacement is needed.
P0319 keeps coming back - why?
If P0319 keeps returning, it often means the initial diagnosis was incomplete, or the wrong part was replaced. Common reasons for recurrence include an intermittent wiring issue, a faulty PCM that wasn't addressed, or a misdiagnosis where a different underlying problem is causing the misfire detection system to fault.
Will P0319 fail emissions/smog test?
Yes, P0319 will cause your vehicle to fail an emissions or smog test. Any active Check Engine Light, especially one related to engine performance or monitoring systems, prevents the vehicle from passing inspection.
What's the difference between P0319 and P0300?
P0319 indicates a fault with the *system* that detects misfires (like a sensor or the monitoring logic itself), while P0300 indicates a *random or multiple cylinder misfire* has actually occurred. P0319 means the computer might not be able to accurately *tell* you if a misfire is happening, whereas P0300 means it *knows* misfires are happening but can't pinpoint a single cylinder.
P0319 on Ford F-150
On many Ford F-150s, P0319 often points to an issue with the Rough Road Sensor or the misfire monitor's ability to compensate for road conditions. This sensor helps the PCM distinguish between engine misfires and vibrations from rough roads. Diagnosis should focus on this sensor and its circuit.
Questions to Ask Your Mechanic
Did you verify the P0319 code with a professional scan tool, or is it from a generic scanner?
Good answer: Yes, I used a factory-level scan tool, and P0319 is confirmed. It's not a misinterpretation.
What are the live data readings for the Crankshaft Position Sensor and Rough Road Sensor (if applicable)?
Good answer: The CKP signal is stable, but the rough road sensor shows intermittent dropouts, or the misfire counter is behaving erratically without actual misfires.
Have you checked for any technical service bulletins (TSBs) related to P0319 for my specific vehicle?
Good answer: Yes, I found a TSB for a PCM software update that addresses misfire detection logic for your model year, and we've applied it.
Repair Cost Estimate
DIY Repair
Parts only
$100-$400
Shop Repair
Parts + labor
$200-$800
Save $100-$400 by doing it yourself
Difficulty
intermediate
Time
1-3 hours
Intermediate - diagnosing P0319 requires a good scan tool and understanding of sensor diagnostics, making it more challenging than a simple part swap.
Cost of Waiting
Ignoring P0319 means your engine's ability to detect misfires is compromised. If actual misfires occur, they could go unnoticed, leading to unburned fuel entering and damaging your catalytic converter. A $100-$400 sensor fix now prevents a $800-$2,500 catalytic converter replacement later.
Tools You'll Need
- OBD-II scan tool (professional grade recommended)
- Socket set
- Wrench set
- Multimeter (for wiring checks)
- Wire strippers/crimpers (if wiring repair is needed)
P0319 is a tricky code because it doesn't point to a specific misfiring cylinder, but rather a problem with the detection system. Most repairs involve replacing a sensor or fixing wiring, and your engine will be accurately monitored afterward.
- Family-owned since 1957
- 990,000+ happy customers
- Fast nationwide shipping
- Easy returns
Your Next Steps
Step 1: Confirm the P0319 code with a professional scan tool. Check for any other misfire or CKP sensor codes that might be present.
Step 2: Inspect the Crankshaft Position Sensor (CKP) and its wiring. If your vehicle has a Rough Road Sensor, inspect it and its wiring as well. Look for physical damage, corrosion, or loose connections.
Step 3: If visual inspection doesn't reveal the issue, use a multimeter to test the CKP sensor's resistance and signal, and check for proper voltage and ground at its connector. Monitor live data from the CKP and rough road sensor (if available) with a scan tool while driving to identify intermittent faults.