P0345 on Honda: How to Diagnose & Fix
Camshaft Position Sensor Circuit Malfunction (Bank 2)
1 Honda model · 1 documented issue · 1 critical · $40-$300 repair
P0345 on Honda by model: symptoms, diagnosis and fix
Honda Passport owners report the Idle Stop (automatic engine start-stop) feature causing dangerous stalling issues. When the engine auto-stops at red lights or in traffic, it fails to restart when the brake is released, leaving the vehicle stranded in traffic. The "Collision Mitigation System" warning light often appears during these incidents. The Idle Stop system is overly aggressive and doesn't account for battery health, A/C load, or hot weather conditions. Unlike some competitors, Honda doesn't have a shift interlock, so the vehicle can roll if stalled on a hill. Many owners permanently disable Idle Stop to avoid this issue.
Common Symptoms
- Engine fails to restart after auto-stop at red light
- Vehicle stalls in traffic when Idle Stop engages
- Collision Mitigation System warning light during stall
- Multiple restart attempts needed after auto-stop
- Engine cranks but won't start after Idle Stop
- Vehicle rolls backward when stalled on hill
- Battery warning light after failed restart
How to Fix
Temporary: Press Idle Stop button to disable every time you start the vehicle (annoyingly resets each ignition cycle). Permanent disable (DIY): Install Idle Stop Eliminator plug-in module ($40-80) that automatically disables the feature every startup - very popular on PassportForums. If stalling occurs: Shift to Park, turn off ignition, wait 10 seconds, restart engine. Battery related: If Idle Stop frequently won't engage or causes stalling, have battery tested (weak battery confuses system). Honda has released software updates but they don't fully address the issue.
Owner tips & cautions
- WarningCRITICAL: If Idle Stop fails on a hill, vehicle will roll backward (no shift interlock) - keep foot firmly on brake and shift to Park immediately.
- TipIf you prefer manual disable, lightly tap brake pedal when stopped - Idle Stop won't engage. Less annoying than pressing button every startup.
- TipWeak battery makes Idle Stop unreliable - if system is acting weird, get battery load tested before chasing gremlins.
P0345 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0345 mean on a Honda?
P0345 stands for "Camshaft Position Sensor Circuit Malfunction (Bank 2)." P0345 means the engine computer detected a malfunction in the camshaft position sensor circuit on bank 2 (the cylinder bank not containing cylinder number one). The camshaft position sensor tells the computer where the camshaft is in its rotation, which it uses for precise fuel injection and ignition timing and to manage cylinder identification. When the signal is missing, erratic, or out of range, the computer can't reliably track cam position, which may cause hard starting, rough running, stalling, or a no-start. The fault is usually in the sensor, its wiring, or the connector rather than the camshaft itself. On Honda it is documented across 1 model: Passport.
What are the most common causes of P0345?
The most common causes of P0345 are: Failed camshaft position sensor (bank 2), Damaged wiring, connector, or corrosion in the sensor circuit, Metal debris or oil contaminating the sensor tip, Faulty reluctor/tone wheel on the camshaft, Open or short in the sensor signal or power circuit, Loose timing chain/belt or VVT issue affecting cam timing, Poor ground or low reference voltage to the sensor. The specific cause varies by vehicle.
How much does it cost to fix P0345 on a Honda?
Published repair estimates on Honda range from $40 to $300 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0345 on a different make?
View P0345 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.