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P0345 on a 2017 Honda Civic

Camshaft Position Sensor Circuit (Bank 2)

P0345 on a 2017 Honda Civic indicates camshaft position sensor circuit (bank 2). It usually stays drivable short-term but should be diagnosed promptly. The most common cause is failed bank 2 camshaft position sensor (typically $100–$400). Confirm the root cause before replacing parts.

Severity: high Safe to drive (short term) Compact Sedan

Reviewed by MECH AI Editorial · Last verified · Includes 20 active NHTSA TSBs

What does P0345 mean on a 2017 Honda Civic?

P0345 is the Bank 2 counterpart of P0340. The ECM cannot interpret the camshaft position sensor signal on the Bank 2 "A" camshaft — the signal is missing, out of phase with the crankshaft signal, or carrying electrical noise. Bank 2 is the cylinder bank that does NOT contain cylinder number 1, so P0345 only appears on engines with two banks: V6, V8, V10, V12, and flat / boxer layouts. An inline engine has a single bank and cannot set this code.

The symptoms, causes, and diagnostic steps below describe P0345 itself, so they read the same on nearby Honda Civic model years. Powertrain and trim details vary year to year — confirm the specifics against your own vehicle before buying parts.

Is it safe to drive a 2017 Honda Civic with P0345?

In most cases a 2017 Honda Civic stays drivable for short trips with P0345 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.

What are the symptoms of P0345 on a 2017 Honda Civic?

What causes P0345 on a 2017 Honda Civic?

Cause Likelihood Estimated repair (USD)
Failed Bank 2 camshaft position sensor Most common $100–$400
Damaged or corroded Bank 2 sensor connector Common $50–$250
Chafed or broken Bank 2 sensor wiring Common $80–$350
Oil leaking into the cam sensor port through a failed o-ring Common $80–$350
Loose, slipped, or damaged Bank 2 camshaft reluctor wheel Occasional $300–$1,200
Timing chain stretch on the Bank 2 side causing cam-crank correlation drift Occasional $800–$3,000
Failed PCM input for the Bank 2 cam sensor circuit Rare $400–$1,500

Cost ranges are editorial estimates for parts and labor at an independent U.S. shop — not quotes. What you actually pay moves with your region, the shop's hourly rate, which engine you have, and how much diagnostic time the job takes. Dealer service departments typically sit above these ranges.

How to diagnose this on a 2017 Honda Civic

  1. Identify which bank is Bank 2 on this engine

    Bank 2 is the bank without cylinder number 1. On a transverse V6 that is usually the bank nearest the firewall, but "usually" is not good enough — manufacturers vary, and getting this backwards means replacing a healthy sensor on the wrong side of the engine. Confirm the cylinder numbering in the service information for this specific engine before you buy anything.

    Tools: Vehicle-specific service information

  2. Inspect the connector and wiring

    Unplug the Bank 2 sensor and check for corrosion, bent or pushed back pins, oil in the connector body, and chafing where the harness routes past brackets. On transverse engines the rear-bank harness is the one that gets pinched during other repairs, so look carefully if the engine has had recent work.

    Tools: Connector unlock tool, Flashlight, Inspection mirror

  3. Confirm power and ground at the connector

    Key on with the sensor unplugged, verify the supply voltage the wiring diagram specifies and a clean low-resistance ground path. Missing power or a poor ground produces P0345 with a perfectly good sensor installed, and no amount of parts swapping will fix it.

    Tools: Multimeter, Wiring diagram

  4. Scope or graph the Bank 2 sensor signal

    Capture the signal while cranking or running. The Bank 2 sensor should produce the same clean pattern as Bank 1 — which gives you a free reference waveform on the same engine. Comparing the two banks side by side is the fastest way to confirm one is bad.

    Tools: Oscilloscope, or scan tool with raw sensor PIDs, Back-probe pins

  5. Check cam-crank correlation on the Bank 2 side

    Watch the Bank 2 cam signal against the crank signal in live data. They should hold a fixed relationship. An offset that drifts as RPM rises suggests chain stretch on that bank rather than a sensor fault — and replacing the sensor will not resolve it.

    Tools: Scan tool with dual-PID graphing

Known Technical Service Bulletins for the 2015-2019 Honda Civic

Manufacturers publish Technical Service Bulletins (TSBs) when a known issue affects a specific vehicle. These bulletins come from the NHTSA database for your Honda Civic.

+14 more TSBs available in MECH AI's TSB explorer for this vehicle.

NHTSA complaints & recalls for the 2017 Honda Civic

Owner-reported safety complaints and official recalls filed with the U.S. National Highway Traffic Safety Administration for the 2017 Honda Civic. Use these to gauge how common a problem is on your specific vehicle before you start chasing Honda Civic diagnostics.

569 owner complaints
22 involved a crash
6 involved a fire
11 reported injuries
  • ENGINE 65
  • STEERING 161
  • UNKNOWN OR OTHER 160
  • ELECTRICAL SYSTEM 99
  • SERVICE BRAKES 35

6 active recalls

  • STEERING:ELECTRIC POWER ASSIST SYSTEM Sep 2018

    Honda (American Honda Motor Co.) is recalling certain 2017-2018 Honda Civic and CR-V vehicles. The magnet that controls the torque sensor output signal for the electronic power steering system may not be properly secured, allowing the magnet to become dislodged. During a full…

    NHTSA campaign 18V663000
  • EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL Nov 2018

    Honda (American Honda Motor Co.) is recalling certain 2017-2018 Honda Civic Hatchback and Civic Type R vehicles. The owners guide in these vehicles may not have been included or if included, the owner's guide may not have been properly provided required information. As such, t…

    NHTSA campaign 18V817000
  • AIR BAGS Apr 2018

    Honda (American Honda Motor Co.) is recalling certain 2017 Honda Civic Hatchback and Civic Type R vehicles. Driver and front passenger seatback pads sold as replacement service parts were made without slit openings for the seat-mounted side air bags. In the event of a crash nece…

    NHTSA campaign 18V266000
  • POWER TRAIN:DRIVELINE:DRIVESHAFT Nov 2017

    Honda (American Honda Motor Co.) is recalling certain 2017 Honda Civic Sedan and Coupe vehicles. The right halfshaft may have been improperly heat treated, reducing its strength.…

    NHTSA campaign 17V706000

How do I fix P0345 on a 2017 Honda Civic?

Engines in the 2017 Honda Civic

The 2017 Honda Civic was offered with the 1.5L 4-cylinder and 2.0L 4-cylinder engines. Which one you have changes where P0345 is most likely to originate, so confirm your engine before ordering parts.

Engine data: EPA fueleconomy.gov.

If your engine is an inline-4, this code is not yours

P0345 refers to Bank 2 — the cylinder bank that does not contain cylinder number 1. Engines with a single bank (inline-3, inline-4, inline-5, inline-6) have no Bank 2 and cannot legitimately set this code. If a scan tool reports P0345 on a four-cylinder, the most likely explanations are a generic code lookup table in the tool showing you the wrong description, or a manufacturer-specific code that shares the P0345 number. Check the code against the manufacturer’s own definition before you go looking for a sensor that does not exist.

The free reference waveform

A two-bank engine gives you something a single-bank engine cannot: an identical known-good sensor sitting on the other side of the same engine, running in the same conditions, at the same age. Scope both cam sensors together. If Bank 1’s trace is clean and Bank 2’s is noisy, missing pulses, or flat, you have your answer without needing a service manual waveform to compare against.

Bank 2 access is often the real cost

The part itself is the same price on either bank. The labour frequently is not. On transverse V6s the rear bank sits against the firewall, and reaching its cam sensor can mean removing the intake manifold or lifting the engine on its mounts. Before assuming this is the same job as the Bank 1 sensor you replaced two years ago, look up the labour time for your specific engine — it is a fair question to ask a shop for a quote on even if you would normally do the work yourself.

When P0345 is really a timing chain

On engines with documented chain-stretch histories, a cam sensor code can be the first visible symptom of a chain that has worn past spec. The sensor reports the cam’s position accurately; the cam is simply not where the ECM expects it to be. The tell is cam-crank correlation that drifts as RPM climbs, usually paired with a rattle from the timing cover on cold start. If you see both, replacing the sensor buys you nothing — and a chain that skips a tooth on an interference engine turns a timing job into an engine rebuild.

P0345 on a 2017 Honda Civic: frequently asked questions

What does diagnostic trouble code P0345 mean on a 2017 Honda Civic?

P0345 is the Bank 2 counterpart of P0340. The ECM cannot interpret the camshaft position sensor signal on the Bank 2 "A" camshaft — the signal is missing, out of phase with the crankshaft signal, or carrying electrical noise. Bank 2 is the cylinder bank that does NOT contain cylinder number 1, so P0345 only appears on engines with two banks: V6, V8, V10, V12, and flat / boxer layouts. An inline engine has a single bank and cannot set this code.

What are the symptoms of P0345 on a 2017 Honda Civic?

Check Engine Light is illuminated. Hard start with extended cranking. Intermittent stalling, often when hot. Possible complete no-start condition. Rough running and reduced power. Engine cuts out and restarts after a brief delay. Reduced fuel economy

What causes P0345 on a 2017 Honda Civic?

Failed Bank 2 camshaft position sensor (most-common). Damaged or corroded Bank 2 sensor connector (common). Chafed or broken Bank 2 sensor wiring (common). Oil leaking into the cam sensor port through a failed o-ring (common). Loose, slipped, or damaged Bank 2 camshaft reluctor wheel (occasional). Timing chain stretch on the Bank 2 side causing cam-crank correlation drift (occasional). Failed PCM input for the Bank 2 cam sensor circuit (rare)

Is it safe to drive a 2017 Honda Civic with P0345?

In most cases a 2017 Honda Civic stays drivable for short trips with P0345 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.

Related diagnostic codes

P0345 on other Honda Civic model years