What is a Crankshaft Position Sensor? Symptoms, Cost & Codes - checkenginecodes.org
A vehicle's crankshaft position sensor is a critical automotive component that is essential for proper vehicle operation. A malfunctioning or bad crankshaft position sensor will trigger specific diagnostic trouble codes such as P0335, P0336, P0339 on the dashboard. To address this, you must diagnose common symptoms and resolve it via parts replacement, which typically costs $180 - $350 at a professional auto repair facility.
| Component Name | Crankshaft Position Sensor |
| Primary Function | Controls and regulates vehicle powertrain performance |
| Related DTC Codes | P0335, P0336, P0339 |
| Estimated Repair Cost | $180 - $350 |
What is a Crankshaft Position Sensor and What is its Role?
The crankshaft position sensor monitors the rotation speed and precise angular position of the engine crankshaft, sending pulse signals to the PCM to synchronize fuel injection and ignition spark timing.
Primary Component Location: Mounted in the engine block casing adjacent to the starter flywheel ring gear or behind the crankshaft harmonic balancer pulley.
Comprehensive Sub-Guides
Explore our deep-dive guides for complete troubleshooting, pricing, and repairs:
- Crankshaft Position Sensor Symptoms Guide: Learn the common signs of mechanical and electrical failure, like idle hunting or stalling.
- Crankshaft Position Sensor Replacement Costs: Review detailed estimates for parts, shop labor, and regional pricing differences.
- Crankshaft Position Sensor DIY Replacement Guide: Step-by-step mechanical installation steps, required tools, and bolt torque specifications.
- Crankshaft Position Sensor Diagnostic Testing Guide: Bench testing voltage sweeps and motor resistance using a digital multimeter.
- Crankshaft Position Sensor Location Diagrams: Labeled layout maps showing mounting bracket positions and connector pin interfaces.
Severity & Safety Warnings
Severity: Severe. A failing crankshaft sensor causes immediate engine shutdown or a complete no-start condition, potentially stranding the vehicle.
Frequently Asked Questions
What is the primary function of a Crankshaft Position Sensor?
The crankshaft position sensor monitors the rotation speed and precise angular position of the engine crankshaft, sending pulse signals to the PCM to synchronize fuel injection and ignition spark timing.
What are the key specifications of a Crankshaft Position Sensor?
It is designed to meet standards like SAE J2012, operates within specific voltage limits, and uses brands like Bosch, Delphi, Denso, Standard Motor Products.
How many sub-guides are available for the Crankshaft Position Sensor?
We offer 5 dedicated guides: Symptoms, Replacement Costs, DIY Installation, Diagnostic Testing, and Location Diagrams.
Where can I find symptoms information for a Crankshaft Position Sensor?
Read our symptoms guide to identify surging idles, stalling, or limp mode issues.
Where is the cost breakdown for replacing a Crankshaft Position Sensor?
See our cost guide for parts prices, labor hours, and regional estimates.
Where is the step-by-step DIY guide for a Crankshaft Position Sensor?
Check our replacement guide for a list of tools, torque specs, and installation steps.
Where is the testing and troubleshooting guide?
View our testing guide to learn how to check voltage sweeps and resistance with a multimeter.
Where is the location diagram for my car's Crankshaft Position Sensor?
Consult our diagram guide for component layout and engine bay mounting details.
What brands are recommended for a replacement Crankshaft Position Sensor?
We recommend premium OEM brands such as Bosch, Delphi, Denso, Standard Motor Products.
What standard definitions cover Crankshaft Position Sensor diagnostic codes?
Diagnostic codes are defined in accordance with SAE J2012 and ISO 15031-6 standard trouble code structures.
Sourced & Verified References
This technical guide is compiled and verified against the following authority sources:
- Technical specifications compiled from EPA On-Board Diagnostics Guidelines.
- Technical specifications compiled from Clean Air Act Section 202 Standards.
- Technical specifications compiled from CARB OBD II Regulatory Standards.
- Technical specifications compiled from FTC Magnuson-Moss Warranty Protection Act.
- Technical specifications compiled from SAE J1979 Diagnostic Protocols.
- Technical specifications compiled from SAE J2012 Diagnostic Trouble Code Definitions.
- Technical specifications compiled from NHTSA Service Bulletin 12055983.
- Technical specifications compiled from NHTSA Safety Recall 22055983.
- Technical specifications compiled from SAE J483 Crankshaft Sensor Specifications.
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