P0347 code: Camshaft Position Sensor A Circuit Low (Bank 2)
P0347 means camshaft Position Sensor A Circuit Low (Bank 2). The code says where to look, not what failed — the fix depends on which cause your car actually has.
What P0347 means
P0347 is the Bank 2 version of a cam-sensor circuit-low fault: the camshaft position sensor on the bank opposite cylinder 1 — which only exists on V-type and flat engines — is reading stuck at or below its minimum expected level. The computer uses each bank's cam signal (with the crank signal) to time fuel injection and identify cylinders, so a flatlined signal usually means a failed sensor, a wire shorted to ground, or a corroded connector; a damaged reluctor or metal debris on the sensor tip can also kill the signal. Many engines still start and run on the remaining sensors, but hard starting, rough running, stalling, and on some engines a no-start are all on the table, so this belongs in the fix-promptly category.
P0347 symptoms
- Hard starting or extended cranking
- Stalling or rough running
- Hesitation and reduced power
- Occasional no-start on some engines
- Check-engine light
What it costs to fix P0347
Typical range: $80–$350 · about ~0.2–1 hrs of labor
| If the cause is… | Part | Labor |
|---|---|---|
| Camshaft position sensor (Bank 2) | $30–$120 | ~0.2–1 hrs |
| Wiring / connector repair | $10–$120 | ~0.5–1.5 hrs |
Usually a quick, inexpensive sensor swap — though on some V-type engines the Bank 2 sensor sits toward the firewall and is more awkward to reach than its Bank 1 twin, adding a bit of labor.
The price swings on which cause it turns out to be — so confirm the cause before paying. Diagnose P0347 for my exact vehicle →
How to fix P0347
Moderate — doable at home with common tools and patience
- Check whether Bank 1's cam sensor complains too
Bank 2 only exists on V and flat engines, on the side without cylinder 1. If P0342, the Bank 1 equivalent, set together with P0347, both sensors are probably losing a shared reference, ground, or harness splice — check those before touching either sensor. P0347 on its own points at the Bank 2 sensor, its pigtail, or the wire between it and the computer.
- Unplug the sensor and watch what the signal does
Back-probe the Bank 2 signal pin with the key on and note the voltage, then disconnect the sensor and measure the harness side. If the signal rises to the computer's pull-up once the sensor is off, the sensor was internally dragging it to ground; if it stays near zero with the sensor unplugged, the wire itself is shorted to ground or open back to the computer.
- Confirm reference and ground at the connector
With the sensor still unplugged and the key on, the reference pin should show the voltage in the service manual — commonly 5 volts, sometimes battery voltage — and the ground pin should have near-zero resistance to engine ground. A missing reference reads as a dead, low signal even when the sensor is perfect.
- Trace the Bank 2 harness for chafe to ground
Follow the Bank 2 sensor lead along the head, across brackets, and past the exhaust crossover where fitted, looking for insulation worn through to bare copper or missing clips that let the loom sag onto hot metal. With the sensor unplugged, flex suspicious sections while watching the pull-up voltage; a sudden drop to zero pins down the spot.
- Inspect the old sensor, then fit the replacement
Look for swarf on the tip or a cracked body, and peer at the reluctor through the bore for damage. Snug the new sensor's bolt without overtightening, clip the lead back into its original routing away from heat, then confirm cranking time is back to normal on both a cold start and a warm restart.
DIY or shop? The voltage checks are straightforward with a multimeter and back-probe pins, and they usually tell you whether you're buying a sensor or repairing a wire. The hard part is reaching the Bank 2 sensor: on many V6 and flat engines it's at the back of the far head and may need a cowl, intake plenum, or wheel-well liner out of the way. Let a shop take it when the short is inside a harness you can't see, the sensor is out of reach, or a new sensor didn't help — and if the car has stalled, tow it.
Tools for the DIY steps: Digital multimeter · Back-probe pins · Wiring diagram · Socket set with swivel joints · Flashlight and inspection mirror · Electrical contact cleaner
Not sure which step applies to your car? Get the likely cause for your exact vehicle before buying anything for P0347.
Start a case with P0347 and your car. Redline weighs these causes against what your car shows, and names the check that would settle it before you buy parts.
Can I drive with P0347?
Redline can’t determine from a symptom or code alone whether your car is safe to drive.
P0347: common questions
What does P0347 mean in plain terms?
The cam sensor on Bank 2 — the cylinder bank without cylinder 1, so V-type and flat engines only — has a signal stuck low. That's almost always electrical: a dead sensor, a wire shorted to ground, or a corroded connector. The Bank 1 equivalent is P0342.
Will my car still start with P0347?
Usually — most engines can run using the crank sensor and the other bank's cam sensor, just with longer cranking or rougher running. Some engines are stricter and may intermittently refuse to start, so don't bank on it continuing to start.
Is it the sensor or the wiring?
The sensor is the most common failure, but the wiring to the Bank 2 side often routes through hotter, tighter spaces, and shorts or corrosion there mimic a dead sensor exactly. A quick circuit test before replacement avoids buying the wrong fix.
How much does it cost to fix P0347?
Typically inexpensive — the sensor is a cheap part and the swap usually takes under an hour, a bit more if the Bank 2 sensor is tucked against the firewall. Wiring repairs are similar once the fault is found.
Related trouble codes
Don’t have a scanner yet? A ~$25 Bluetooth adapter reads codes like P0347 from your phone. See our guide to the best OBD2 Bluetooth adapters. Run a repair shop? See Redline for shops.
Generic OBD-II reference. Manufacturer-specific behavior varies. Confirm with a scan tool and, for safety-related codes, a professional inspection. Cost ranges are reference ranges, not quotes.
Seeing P0347 on your car?
Every problem becomes a Case. Tell Redline what the car is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
“Inner pad ~1 mm. Outer pad 3 mm.”
Next: check the slide pins move freely before buying parts.