P0338
Fix within a few daysThe engine computer detects a voltage signal from the crankshaft position sensor that is too high, indicating an electrical problem with the sensor or its circuit.
Code P0338 means the crankshaft position sensor signal is too high. Common causes: Crankshaft position sensor (70%), wiring issues (25%). Drivability: Limit driving, fix within a few days. Repair cost: $30-$150 DIY, $130-$450 professional.
Can I Drive With P0338?
No, stop driving
Immediate repair needed
Stop driving immediately if: Engine stalls, won't start, or Check Engine Light is flashing
Symptoms of P0338
- 1Engine cranks but won't start
- 2Engine stalls unexpectedly while driving
- 3Rough idle or engine hesitation
- 4Reduced engine power
- 5Check Engine Light is on
Common Causes of P0338
Parts most likely causing this code, ranked by probability
The sensor itself has failed internally, sending an incorrect high voltage signal to the engine computer.
70% of P0338 cases are fixed by replacing this part
Damaged, corroded, or loose wiring and connectors between the sensor and the engine computer can cause an erratic or high voltage reading.
25% of P0338 cases are fixed by repairing the wiring or connector
A rare internal fault within the engine computer's input circuit for the crankshaft position sensor can cause this code.
5% of P0338 cases are fixed by replacing the ECM/PCM
Check These First (Before Buying Parts)
- Visually inspect the crankshaft position sensor's electrical connector for looseness, corrosion, or bent pins.
- Examine the wiring harness leading to the sensor for any signs of damage, fraying, or rodent chewing.
How to Diagnose P0338
- 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.
- 3Using a multimeter, test the voltage at the crankshaft position sensor connector to ensure proper power and ground supply.
- 4Test the resistance of the crankshaft position sensor itself (if applicable for your sensor type) and compare it to factory specifications.
- 5If possible, use a scan tool with live data to monitor the crankshaft position sensor signal while cranking the engine.
P0338 on Popular Vehicles
Honda Accord
2003-2024Honda Accords are known to experience crankshaft position sensor failures, often due to heat exposure or internal sensor degradation. Wiring issues are less common but should be checked.
75% fixed by replacing the crankshaft position sensor
Toyota Camry
2007-2024For Toyota Camrys, P0338 is frequently resolved by replacing the crankshaft position sensor. Access can vary by engine, but the repair is generally straightforward.
70% fixed by replacing the crankshaft position sensor
Ford F-150
2004-2024On Ford F-150s, while the sensor itself fails, pay close attention to the wiring harness near the sensor. It can be exposed to road debris or engine heat, leading to chafing or corrosion.
60% fixed by replacing the crankshaft position sensor, 30% by wiring repair
Frequently Asked Questions
What does P0338 mean?
P0338 indicates that the engine's computer has detected an abnormally high voltage signal from the crankshaft position sensor, which is critical for engine timing.
Can I drive with P0338?
No, stop driving. This code can cause your engine to stall unexpectedly or not start at all, creating a dangerous situation. Get it fixed immediately.
Will P0338 clear itself?
No, this code will not clear itself. The underlying electrical fault or sensor failure requires diagnosis and repair before the code will go away.
How do I fix P0338 myself?
Start by inspecting the crankshaft position sensor and its wiring for damage. If the wiring is good, replacing the crankshaft position sensor is the next step. You'll need basic hand tools and possibly a multimeter.
How much does it cost to fix P0338?
DIY repair costs $30-$150 for a new crankshaft position sensor. Professional repair at a shop typically costs $130-$450, including parts and labor.
P0338 keeps coming back - why?
If P0338 returns, it often means the initial diagnosis missed something. Re-check the wiring harness thoroughly for intermittent breaks or corrosion, or consider that the engine computer itself might have a rare internal fault.
Will P0338 fail emissions/smog test?
Yes, P0338 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on is an automatic failure, and the underlying issue affects engine operation.
What's the difference between P0338 and P0335?
P0338 indicates a 'high input' signal from the crankshaft position sensor, meaning the voltage is too high. P0335 indicates a 'circuit malfunction,' which is a more general fault suggesting the sensor isn't sending any signal or an incorrect one.
P0338 on Honda Accord
P0338 on a Honda Accord often points directly to a faulty crankshaft position sensor. These sensors can fail due to heat or age. Always inspect the wiring for rodent damage, which is also common.
Questions to Ask Your Mechanic
Did you check the voltage at the crankshaft position sensor connector, and did you test the sensor's resistance?
Good answer: Yes, I confirmed proper power and ground at the connector, and the sensor's resistance was outside factory specifications, indicating an internal fault.
What did you find when you inspected the wiring harness for the crankshaft position sensor?
Good answer: I thoroughly inspected the wiring from the sensor all the way back to the ECM connector. There were no signs of chafing, corrosion, or breaks.
Repair Cost Estimate
DIY Repair
Parts only
$30-$150
Shop Repair
Parts + labor
$130-$450
Save $100-$300 by doing it yourself
Difficulty
intermediate
Time
1-3 hours
Intermediate - requires careful inspection, basic electrical testing with a multimeter, and potentially replacing a sensor that might be in a tight spot.
Cost of Waiting
Ignoring P0338 means your engine can stall at any time, which is a major safety hazard. Continued driving with an intermittent signal can also cause misfires, sending unburned fuel to your catalytic converter. A $30-$150 sensor job now prevents a $1,200-$2,500 converter replacement later.
While You're In There...
Cleaning the electrical connector ensures a good connection and prevents future intermittent issues, especially if corrosion is present.
Applying dielectric grease to the connector pins after cleaning helps prevent corrosion and ensures a reliable electrical connection.
Tools You'll Need
- Basic hand tools (sockets, wrenches)
- Multimeter
- Wire strippers/crimpers (if wiring repair is needed)
- Scan tool (for clearing codes and live data)
P0338 is a common sensor code. While it can cause serious drivability issues, the repair is usually straightforward and your engine will run reliably once fixed.
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Your Next Steps
Step 1: Perform a thorough visual inspection of the crankshaft position sensor and its wiring harness. Look for any obvious damage, loose connections, or corrosion.
Step 2: If the visual inspection doesn't reveal the issue, use a multimeter to test the voltage at the sensor connector and the resistance of the sensor itself. Compare readings to your vehicle's service manual.
Step 3: If the sensor tests faulty or the wiring is damaged, replace the crankshaft position sensor or repair the wiring. Clear the code with a scan tool and test drive the vehicle.