P0347 — Camshaft Position Sensor “A” Circuit Low #

Note: The description for DTC P0347 can vary depending on the vehicle manufacturer.

• Ford: Camshaft Position Sensor “A” Circuit Low Input (Bank 2)
• Chrysler: CMP Sensor Circuit Low Input Bank 2 Sensor 1
• GM: Camshaft Position (CMP) Sensor Circuit Low Voltage Bank 2 Sensor 1
• Toyota: Camshaft Position Sensor “A” Low Input (Bank 2)

Summary for code P0347 #

P0347 indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected a low voltage signal from the Camshaft Position Sensor “A” circuit on bank 2 of the engine. The camshaft position sensor is a device that monitors the position and rotational speed of the camshaft, transmitting this data to the PCM for precise fuel injection and ignition timing. When the signal drops below a manufacturer-specific threshold, the PCM sets this code. This issue can cause drivability problems, rough running, or make the engine hard to start. Addressing this code promptly is essential for optimal engine performance.

Common symptoms for code P0347 #

When code P0347 is present, the vehicle may exhibit a variety of symptoms. These symptoms often relate to engine timing and performance, since the camshaft position sensor is crucial for synchronizing fuel injection and ignition. Drivers may notice anything from mild hesitation to severe performance loss.

• Illuminated check engine light
• Hard starting or extended cranking
• Rough idle or fluctuating RPM
• Decreased engine power
• Poor fuel economy
• Engine may stall unexpectedly

Most likely causes for code P0347 #

There are several potential causes for a P0347 fault, but some are more common than others. Most issues originate from electrical faults or sensor wear, but mechanical problems can also play a role.

1. Faulty camshaft position sensor (Bank 2, Sensor “A”)
2. Wiring issues (open, short to ground, corroded connectors)
3. Poor connection at the sensor or PCM/ECM
4. Failed PCM/ECM (rare)
5. Mechanical timing issues (stretched timing chain or belt)

Step-by-step diagnostic for code P0347 #

Diagnosing P0347 requires a systematic approach to avoid replacing parts unnecessarily. Use a scan tool and basic electrical test equipment to check each component in sequence.

• Verify the code and clear it; see if it returns after a short test drive.
• Inspect the camshaft position sensor and harness for visible damage or corrosion.
• Check connector pins for looseness, corrosion, or bent terminals.
• Using a multimeter, measure voltage and ground at the sensor connector (with ignition on).
• Check sensor signal output while cranking or running the engine.
• Test continuity of the wiring between the sensor and PCM/ECM.
• If all checks pass, consider a faulty PCM/ECM or internal engine timing issues.

Possible repairs for code P0347 #

Once the root cause is identified, repairs for P0347 can range from simple to complex. It’s important to address both the symptoms and the underlying issue to prevent recurrence.

• Replace the camshaft position sensor (Bank 2, Sensor “A”) if faulty.
• Repair or replace damaged wiring or connectors in the sensor circuit.
• Clean corroded terminals and ensure a secure connection.
• Repair or replace PCM/ECM (only after all other avenues are exhausted and verified).
• If mechanical timing is off, repair the timing chain or belt as needed.

Is it safe to drive with code P0347? #

Limited. You may be able to drive for short distances with code P0347 set, but it is not recommended. This code can cause unpredictable engine performance, including stalling or hard starting. Prolonged driving could lead to further damage or leave you stranded. Prompt diagnosis and repair are highly recommended.

Vehicles most commonly affected by code P0347 #

While P0347 can appear on any OBD-II compliant vehicle, it’s more frequently reported on specific models. This may be due to sensor location, design, or wiring harness routing.

• Ford F-Series (F-150, F-250, etc.)
• Chevrolet Silverado and GMC Sierra (V8 engines)
• Chrysler/Dodge RAM trucks (Hemi V8)
• Toyota Tundra/Sequoia (V8 engines)
• Nissan Titan (V8 engines)

Common mistakes & best practices for code P0347 #

Technicians and DIYers sometimes make avoidable mistakes when troubleshooting P0347. Following best practices helps ensure a correct and lasting repair.

• Replacing the sensor without checking wiring or connectors first
• Overlooking corroded or loose connector pins
• Not verifying the repair by rescanning and road testing
• Ignoring possible engine timing issues
• Assuming all sensors are identical—always use OEM (Original Equipment Manufacturer) parts when possible

Express FAQ for code P0347 #

Code P0347 can raise a lot of questions. Here are quick answers to the most frequent ones.

• Q: Can a bad camshaft position sensor cause my car not to start?
  A: Yes, a faulty camshaft position sensor can prevent the engine from starting or cause extended cranking.
• Q: Will resetting the code fix the problem?
  A: Clearing the code will turn off the check engine light temporarily, but unless the underlying issue is fixed, the code will return.
• Q: Do aftermarket sensors work as well as OEM?
  A: Aftermarket sensors may not always meet OEM specifications. For critical sensors, using OEM parts is highly recommended for best reliability.