P0338: Crankshaft Position Sensor A Circuit High Input
Can you still drive? Not recommended. The engine may stall unexpectedly or fail to start, creating a safety hazard especially in traffic.
What Does P0338 Mean?
Code P0338 is set when the crankshaft position sensor circuit produces a voltage higher than the ECM expects. This could indicate a short to power in the wiring, an incorrect sensor type installed, or a failing sensor with an erratic output. The engine may run erratically or not start.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Short to voltage in sensor wiring
- Incorrect crankshaft position sensor installed
- Internally shorted sensor
- Damaged wiring harness near exhaust or moving parts
Symptoms
- Check engine light on
- Engine runs erratically
- Intermittent no-start condition
- Rough idle
- Engine stalling at random
Diagnostic Steps
- 1Measure sensor circuit voltage with key on, engine off
- 2Inspect wiring harness for shorts to power sources
- 3Verify correct sensor part number for the vehicle
- 4Test sensor output signal with an oscilloscope
- 5Check for wiring damage near exhaust manifold or accessories
Recommended Parts & Tools
crankshaft position sensor
wiring harness repair kit
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $75 - $400 |
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Chat with AI About P0338Commonly Affected Vehicles
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Frequently Asked Questions
Can an aftermarket crank sensor cause P0338?
Yes, some aftermarket sensors have different output characteristics than OEM parts. Always verify the correct part number for your specific vehicle.
Is P0338 dangerous to drive with?
Yes, because the engine can stall without warning. This is particularly dangerous at highway speeds or in heavy traffic.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
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