P0343 on Nissan vehicles
Cam Position Sensor High Input (Bank 1) — what it means on a Nissan, whether it's safe to drive, and the fixes by model and year.
P0343 on a Nissan means cam position sensor high input (bank 1). Most vehicles stay drivable short-term, but diagnose it promptly. The most common cause is open circuit in the cam sensor signal wire or its ground (typically $80–$350). Pick your Nissan model below for its known failure patterns, recalls, and TSBs.
What does P0343 mean on a Nissan?
P0343 is set when the ECM sees the Bank 1 "A" camshaft position sensor circuit sitting above its calibrated maximum voltage. On most engines "A" is the intake camshaft, or the single cam sensor on engines with only one. Because a Hall-effect cam sensor normally idles near reference voltage and pulls the line low as each reluctor tooth passes, a circuit stuck high usually means the sensor is not pulling at all: an open signal or ground circuit, a short to a power source, or a dead sensor. P0343 is the mirror image of P0342.
P0343 is a standardized OBD-II code, so its definition is the same on every Nissan. What differs by model and engine is which cause is most likely — pick your Nissan model below for a diagnosis tuned to its known failure patterns, recalls, and TSBs.
Is it safe to drive a Nissan with P0343?
In most cases a Nissan stays drivable for short trips with P0343 active, but diagnose and repair it promptly. This is a high-severity code — ignoring it can lead to further damage or a failed emissions test. Exact tolerance depends on the model and engine.
What causes P0343 on a Nissan?
| Cause | Likelihood | Estimated repair (USD) |
|---|---|---|
| Open circuit in the cam sensor signal wire or its ground | Most common | $80–$350 |
| Failed camshaft position sensor (output stuck high) | Most common | $100–$400 |
| Cam sensor signal wire shorted to a power source | Common | $80–$350 |
| Corroded connector adding resistance to the signal or ground path | Common | $50–$250 |
| Loose or incorrectly torqued sensor leaving the air gap too large — Costs nothing to check — a sensor backed out of its bore reads high because it never sees the reluctor. | Occasional | $20–$100 |
| Damaged or missing teeth on the camshaft reluctor / tone wheel | Occasional | $300–$1,200 |
| Failed PCM input for the cam sensor circuit | Rare | $400–$1,500 |
Repair costs are typical US ranges and vary by Nissan model, model year, and labor rate. A diagnostic trouble code is a symptom, not a guaranteed failed part — confirm the root cause before replacing anything.
P0343 by Nissan model
Select your Nissan model and year for a P0343 diagnosis tuned to that vehicle's failure patterns, recalls, and TSBs.
Nissan Altima
823 NHTSA owner complaints · 7 recalls on record across the years covered below.
Nissan Sentra
484 NHTSA owner complaints · 5 recalls on record across the years covered below.
Nissan Rogue
1,132 NHTSA owner complaints · 13 recalls on record across the years covered below.
Complaint and recall counts are NHTSA totals for the model years covered on this site, not counts specific to P0343.
P0343 on other makes
Other codes on Nissan vehicles
P0343 on a Nissan: frequently asked questions
What does diagnostic trouble code P0343 mean on a Nissan?
P0343 is set when the ECM sees the Bank 1 "A" camshaft position sensor circuit sitting above its calibrated maximum voltage. On most engines "A" is the intake camshaft, or the single cam sensor on engines with only one. Because a Hall-effect cam sensor normally idles near reference voltage and pulls the line low as each reluctor tooth passes, a circuit stuck high usually means the sensor is not pulling at all: an open signal or ground circuit, a short to a power source, or a dead sensor. P0343 is the mirror image of P0342. P0343 is a standardized OBD-II code, so the definition is the same on every Nissan — which cause is most likely varies by model and engine.
What are the symptoms of P0343 on a Nissan?
Check Engine Light is illuminated. Hard start with extended cranking. Possible complete no-start condition. Stalling, sometimes intermittent. Rough running and reduced power. Hesitation under acceleration. Reduced fuel economy
What causes P0343 on a Nissan?
Open circuit in the cam sensor signal wire or its ground (most-common). Failed camshaft position sensor (output stuck high) (most-common). Cam sensor signal wire shorted to a power source (common). Corroded connector adding resistance to the signal or ground path (common). Loose or incorrectly torqued sensor leaving the air gap too large (occasional). Damaged or missing teeth on the camshaft reluctor / tone wheel (occasional). Failed PCM input for the cam sensor circuit (rare)
Is it safe to drive a Nissan with P0343?
In most cases a Nissan stays drivable for short trips with P0343 active, but it should be diagnosed and repaired promptly — this is a high-severity code. Ignoring it can lead to further damage or a failed emissions test. Exact tolerance depends on the model and engine.