P0373
Fix within a few daysThe engine computer detects an intermittent or erratic signal from the high-resolution timing reference sensor, which is usually the Crankshaft Position Sensor (CKP) or Camshaft Position Sensor (CMP). This means the engine isn't getting a consistent signal about its exact rotational position.
Code P0373 means your engine computer is getting an inconsistent signal from a timing sensor. Common causes: Crankshaft Position Sensor (60%), Camshaft Position Sensor (25%). Drivability: Limit driving, potential for stalling. Repair cost: $50-$150 DIY, $150-$600 professional.
Can I Drive With P0373?
No, stop driving
Immediate repair needed
Stop driving immediately if: Flashing CEL, engine stalls, significant power loss, loud noises.
Symptoms of P0373
- 1Engine stalls unexpectedly while driving
- 2Engine cranks but won't start
- 3Rough idle or misfires
- 4Reduced engine power or hesitation
- 5Check Engine Light is on, possibly flashing
Common Causes of P0373
Parts most likely causing this code, ranked by probability
A faulty crankshaft position sensor sends an inconsistent signal to the engine computer, disrupting engine timing and fuel delivery.
60% of P0373 cases are fixed by replacing this part
A failing camshaft position sensor provides erratic data about valve timing, causing the engine computer to lose synchronization.
25% of P0373 cases are fixed by replacing this part
Damaged, corroded, or loose wiring and connectors to the CKP or CMP sensor can cause intermittent signal loss.
10% of P0373 cases are fixed by repairing wiring
Damage or debris on the tone ring (the notched wheel the sensor reads) can cause an erratic signal.
5% of P0373 cases are fixed by addressing tone ring issues
Check These First (Before Buying Parts)
- Visually inspect the wiring harnesses and connectors for the Crankshaft Position Sensor and Camshaft Position Sensor for any signs of damage, fraying, or corrosion. Ensure they are securely plugged in.
- Check for any obvious debris or foreign objects near the sensor tips that might interfere with their readings.
How to Diagnose P0373
- 1Visually inspect the Crankshaft and Camshaft Position Sensors and their wiring for damage, corrosion, or loose connections.
- 2Use a scan tool to monitor live data from the CKP and CMP sensors while cranking or running the engine, looking for erratic readings.
- 3Check for proper voltage supply and ground at the sensor connectors using a multimeter.
- 4Inspect the tone rings (reluctor wheels) for damage or debris, which may require removing the sensor or other components.
- 5If all else checks out, test the sensor's resistance or signal output directly according to manufacturer specifications.
P0373 on Popular Vehicles
Ford F-150
2004-2024Crankshaft Position Sensor failures are common, often leading to intermittent stalling or no-start conditions. Inspect the sensor and its wiring carefully.
65% fixed by replacing the CKP sensor
Honda Accord
2003-2024Both Crankshaft and Camshaft Position Sensors can fail, sometimes due to oil leaks contaminating the sensor or connector. Check for oil residue.
70% fixed by replacing CKP or CMP sensor
Toyota Camry
2007-2024While less frequent, CKP or CMP sensor failures can occur. Wiring integrity is crucial; ensure connectors are fully seated and free of corrosion.
60% fixed by replacing CKP or CMP sensor
Frequently Asked Questions
What does P0373 mean?
P0373 indicates that your engine's computer is receiving an intermittent or erratic signal from one of the critical engine timing sensors, typically the Crankshaft Position Sensor or Camshaft Position Sensor. This signal tells the computer the exact position and speed of the engine.
Can I drive with P0373?
No, stop driving. This code signals a serious issue with engine timing. Driving with P0373 can lead to sudden engine stalling, making your vehicle unsafe. It can also cause misfires that damage your catalytic converter.
Will P0373 clear itself?
No, P0373 will not clear itself. The underlying issue, usually a faulty sensor or wiring, needs to be physically repaired. The engine computer will continue to detect the erratic signal until the problem is fixed.
How do I fix P0373 myself?
Start by visually inspecting the Crankshaft and Camshaft Position Sensors and their wiring for any obvious damage or loose connections. If no issues are found, you'll need a scan tool to monitor live data from these sensors. If a sensor is confirmed faulty, replacing it is often a straightforward DIY task, requiring basic hand tools.
How much does it cost to fix P0373?
DIY repair for P0373 typically costs $50-$150 for a new Crankshaft or Camshaft Position Sensor. If you take it to a shop, expect to pay $150-$600, which includes parts and 1-3 hours of labor.
P0373 keeps coming back - why?
If P0373 keeps returning, it's likely due to an overlooked issue. Common reasons include: a faulty replacement sensor, underlying wiring damage that wasn't fully repaired, a damaged tone ring, or in rare cases, an issue with the engine computer itself.
Will P0373 fail emissions/smog test?
Yes, P0373 will cause your vehicle to fail an emissions or smog test. The Check Engine Light will be on, and the intermittent timing signal can lead to increased emissions due to improper engine operation.
What's the difference between P0373 and P0335?
P0335 indicates a general malfunction in the Crankshaft Position Sensor circuit, meaning the computer isn't seeing any signal or a continuous incorrect signal. P0373 specifically means the signal is intermittent or erratic, coming and going, or being inconsistent, rather than a complete failure or constant incorrect signal.
P0373 on Ford F-150
On Ford F-150s, P0373 is frequently caused by a failing Crankshaft Position Sensor. These sensors can degrade over time, especially with exposure to engine heat and road debris. Always check the wiring harness for chafing or corrosion near the sensor.
Questions to Ask Your Mechanic
Did you check the live data from both the Crankshaft and Camshaft Position Sensors for erratic readings?
Good answer: Yes, I monitored both sensor signals on the oscilloscope and saw the signal drop out intermittently from the CKP sensor. That confirms the sensor is failing.
What did you find when inspecting the wiring harness and connectors for the timing sensors?
Good answer: I found some corrosion in the CKP sensor connector, which I cleaned, but the signal was still intermittent. The wiring itself looks good, so the sensor is the next step.
Repair Cost Estimate
DIY Repair
Parts only
$50-$150
Shop Repair
Parts + labor
$150-$600
Save $100-$450 by doing it yourself
Difficulty
intermediate
Time
1-3 hours
Intermediate - requires careful inspection and potentially a scan tool to confirm the faulty sensor, but the physical replacement is often straightforward.
Cost of Waiting
Ignoring P0373 can lead to your engine stalling unexpectedly, creating a dangerous driving situation. Continued misfires or incorrect timing can also send unburned fuel into your catalytic converter, causing it to overheat and fail. A $50-$150 sensor replacement now prevents a $1,200-$2,500 catalytic converter replacement later.
While You're In There...
On some vehicles, these sensors are in close proximity or share wiring harnesses, making it efficient to inspect or replace if related issues are present.
Tools You'll Need
- Basic hand tools (sockets, wrenches)
- Multimeter
- OBD-II scan tool with live data capability
- Flashlight
P0373 is a common sensor issue that directly impacts engine timing. While it can cause frustrating symptoms like stalling, replacing the faulty sensor is a direct fix that will restore your engine's reliability.
- Family-owned since 1957
- 990,000+ happy customers
- Fast nationwide shipping
- Easy returns
Your Next Steps
Step 1: Perform a thorough visual inspection of the Crankshaft and Camshaft Position Sensors and their wiring. Look for cuts, chafing, corrosion, or loose connections. Clean any visible corrosion.
Step 2: If the visual inspection doesn't reveal the problem, use an OBD-II scan tool to monitor live data from both sensors. Look for erratic RPM readings or signal dropouts while the engine is running or cranking.
Step 3: If live data confirms an intermittent signal from one sensor, replace that specific sensor. Parts you'll likely need: a new Crankshaft Position Sensor or Camshaft Position Sensor.