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DTC codes / Honda codes / P1337

P1337 · HondaCKP Sensor B Low Input

P1337 on a Honda means the powertrain control module (PCM) has detected a low input voltage on the Crankshaft Position Sensor B circuit, which is the sensor that reports engine speed and crankshaft position. The PCM compares this signal against expected values and flags the code when the voltage stays below the acceptable threshold for a calibrated period.

SystemPowertrain
Code typeHonda specific
SeverityMedium
Fix difficultyIntermediate
AreaIgnition system and misfire

Symptoms you may notice

  • Illuminated check engine light, often with no other noticeable symptoms
  • Intermittent or complete engine stall, especially when the engine is warm
  • Extended cranking before the engine starts or a no-start condition
  • Rough running, misfire, or loss of power under acceleration
  • Tachometer needle fluctuating or dropping to zero while driving
  • Reduced fuel economy or poor throttle response

Common causes, most likely first

  1. Faulty crankshaft position sensor B (internal short or open circuit)
  2. Damaged or corroded wiring harness or connector at the sensor
  3. Poor ground connection for the sensor circuit
  4. Metal debris or damage on the sensor tip or reluctor wheel
  5. PCM internal fault on the sensor input circuit
  6. Electrical interference from aftermarket accessories or poor shielding

How to diagnose and fix it

  1. Scan all modules for stored and pending codes, then record freeze-frame data for P1337
  2. Visually inspect the sensor, connector, and wiring for damage, corrosion, or loose pins
  3. Measure sensor resistance and compare to Honda specifications for the engine
  4. Back-probe the sensor signal wire and check for a low voltage or short to ground with a multimeter
  5. Check the sensor ground circuit for excessive resistance and repair as needed
  6. Replace the crankshaft position sensor B if electrical tests confirm it is faulty
  7. Clear codes and perform a road test to verify the repair and ensure the code does not return

What Honda Techs Check Before Replacing the Sensor

  • A low input code often results from a short to ground in the signal wire rather than a failed sensor, so always check the harness before condemning the part.
  • Metal shavings or a damaged reluctor wheel can mimic a bad sensor by disrupting the magnetic signal, which is easy to overlook during a quick visual inspection.
  • Aftermarket electrical accessories or a poorly installed remote starter can introduce interference on the CKP circuit and set P1337 intermittently.
  • On some Honda engines, a failing sensor may only act up when hot, so a cold resistance test can pass while the sensor is still faulty.
  • P1337 can be stored alongside misfire codes if the PCM loses the crank signal momentarily, so diagnose the root cause rather than chasing misfires first.

Can I keep driving with P1337?

You can usually drive the vehicle to a repair shop if the engine runs normally, but avoid hard acceleration and long trips because a failing crank sensor can cause sudden stalling. If the engine stalls or fails to restart, stop driving and arrange a tow to prevent a safety hazard.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Honda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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