P1347 — Crank / Cam Sensor Range / Performance

Is it safe to drive with P1347?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

What is the most common cause of P1347?

The most common causes are: blown fuse feeding the circuit, open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit.

Will P1347 clear itself?

Sometimes P1347 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

How do I diagnose P1347 myself?

Start with a scan: confirm P1347, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the sensor and actuator circuits, and verify the suspect component against live data before buying parts.

How much does it cost to fix P1347?

Replace the faulty sensor or actuator — $150–$500; Control module repair — $300–$1,000; Repair wiring or connectors — $80–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

The engine control unit constantly monitors the performance of sensors and actuators throughout the powertrain. When it detects readings that fall outside the expected range from the crankshaft or camshaft position sensor circuit, it logs OBD2 trouble code P1347. This specific fault relates to the range and performance characteristics of those critical timing sensors, which means the module has compared the sensor signal against known-good parameters and found a mismatch.

Your vehicle's crankshaft and camshaft position sensors work together to tell the ECU exactly where each engine component sits during the combustion cycle. The crankshaft sensor tracks engine rpm and crank position, while the camshaft sensor identifies which cylinder is approaching its firing stroke. These two signals must remain synchronized for proper fuel injection timing, ignition timing, and emissions control. When the signal from either sensor behaves erratically, drops out entirely, or shows values that do not match expected engine conditions, the ECU flags P1347.

The module will not illuminate the check engine light based on a single anomalous reading. Internal diagnostics require the fault condition to occur repeatedly under specific driving conditions before the warning activates. This threshold helps prevent false triggers from minor electrical noise. The freeze frame data stored alongside P1347 is particularly valuable—it records engine load, rpm, coolant temperature, and vehicle speed at the moment the fault was detected, giving you a precise starting point for your investigation.

Common Symptoms of P1347

• The check engine light illuminates and remains on until the fault clears
• Noticeable increase in fuel consumption compared to normal driving patterns
• Engine may enter limp-home mode with reduced power output depending on which sensor is affected
• Affected system operates intermittently or fails to function entirely
• In some vehicles, the starter may not engage properly due to lost cam/crank correlation

What Causes P1347?

The underlying issue most commonly originates with the sensor itself or the electrical pathway feeding it:

• The crankshaft or camshaft position sensor has failed or degraded over time
• Poor electrical ground at the sensor or control module causing signal interference
• Faulty output driver inside the engine control module that cannot properly process the signal
• Connector damage from corrosion, moisture intrusion, or physical loosening of terminals
• Wiring problems including broken strands, insulation chafing, or accidental shorts to ground or power
• In rare cases, mechanical issues affecting the reluctor wheel or tone ring that the sensor reads

How to Diagnose P1347

Working through this fault systematically prevents unnecessary parts replacement:

1. Connect an OBD2 scanner and confirm P1347 is currently stored. Record the freeze frame data before clearing anything—this snapshot shows exactly what conditions triggered the code, and you should replicate those conditions during your road test.
2. Check for any additional trouble codes stored in the system. Related codes often point toward the root cause rather than just the symptom. Review manufacturer technical service bulletins for your specific make and model, as many P0xxx codes have documented software updates or known fixes.
3. Perform a thorough visual inspection of the wiring harness and connectors associated with the crank and cam sensor circuits. Look for damaged insulation, corroded pins, pushed-out terminals, and any signs of heat damage or melted plastic.
4. Test reference voltage, ground circuit integrity, and signal wire continuity at the sensor connector using a multimeter. Compare your readings against specifications from the service manual.
5. Conduct a wiggle test on the harness while monitoring live data on your scanner. Any signal dropouts or erratic readings indicate an intermittent wiring fault that may not be visible during static inspection.
6. Clear the code, complete a full drive cycle that reproduces the freeze frame conditions, and verify that P1347 does not return. If it reappears, you have confirmed an active fault rather than a historical one.

Repair Options and Costs for P1347

Address the least expensive likely causes before considering component replacement:

• Replace faulty crankshaft or camshaft position sensor: $150–$500
• Repair or replace engine control module: $300–$1,000
• Repair damaged wiring harness or connectors: $80–$250

The total bill for resolving P1347 typically falls between $80 and $1,000 depending on the actual failure point. Spending time on accurate diagnosis upfront keeps costs reasonable—jumping straight to an expensive control module replacement rarely solves the problem when the fault lies in simpler wiring or a $200 sensor.

Driving Safety Verdict for P1347

Severity Level: Low (Short Distance Okay)

Most vehicles remain driveable with P1347 stored, though you may notice sluggish acceleration or slightly elevated fuel usage. The engine typically maintains normal operation without entering fail-safe mode. However, if the vehicle exhibits stalling, fails to start, or displays warnings related to braking or power steering assistance, treat this as a priority repair rather than a wait-and-see situation.

Related OBD2 codes

• P1300: Multi-faults - Bank 1 - With Low Side Shorts
• P1301: Multi-faults - Bank 2 - With Low Side Shorts
• P1302: Injector High Sides Shorted Together
• P1303: IDM Failure
• P1304: Cylinder Head Overtemperature Protection Active
• P1305: Boost Calibration Fault