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DTC codes / Honda codes / P1316

P1316 · HondaSpark Plug Voltage Detection Circuit Malfunction Front Bank

P1316 on Honda vehicles means the powertrain control module (PCM) has detected an abnormal signal in the spark plug voltage detection circuit for the front bank of cylinders. The PCM monitors the ignition coil feedback to confirm each spark event, and this code sets when the voltage pattern falls outside the expected range.

SystemPowertrain
Code typeHonda specific
SeverityMedium
Fix difficultyIntermediate
AreaIgnition system and misfire

Symptoms you may notice

  • Illuminated check engine light, often with no other symptoms besides the warning light
  • Rough idle or misfire sensation, especially when the engine is cold or under light load
  • Slight hesitation or stumble during acceleration from a stop
  • Reduced fuel economy as the PCM adjusts fuel delivery to compensate
  • Intermittent flashing check engine light if the misfire becomes severe enough to threaten the catalytic converter

Common causes, most likely first

  1. Faulty ignition coil on one or more front bank cylinders, causing an erratic voltage feedback signal
  2. Worn or incorrectly gapped spark plugs that alter the voltage waveform the PCM expects to see
  3. Damaged or corroded wiring in the spark plug voltage detection circuit between the coil and the PCM
  4. Loose or contaminated electrical connector at the ignition coil or PCM
  5. Failed PCM driver circuit for the spark plug voltage detection input
  6. Aftermarket ignition components that do not produce the voltage signature the Honda PCM expects

How to diagnose and fix it

  1. Connect a scan tool and record all stored and pending codes, then check for freeze-frame data to see the conditions when P1316 set
  2. Inspect the front bank ignition coils, spark plugs, and coil connectors for physical damage, corrosion, or looseness
  3. Measure the resistance of the spark plug voltage detection circuit wiring between the coil connector and the PCM, looking for opens or high resistance
  4. Swap a known-good ignition coil from another cylinder to the front bank and see if the code follows the coil
  5. Replace spark plugs with the correct Honda-specified type and gap if they are worn or fouled
  6. Perform a wiggle test on the harness and connectors while watching live misfire or voltage data to catch intermittent faults
  7. If all wiring and components test good, diagnose the PCM input circuit and replace the PCM only after confirming the fault is internal

What the voltage detection circuit really monitors

  • P1316 is often set by a failing ignition coil that still fires well enough to avoid a hard misfire code, so the coil can pass a simple spark test and still be the culprit.
  • A loose or corroded ground strap between the engine and chassis can corrupt the voltage feedback signal and set this code without any faulty ignition component.
  • Technicians sometimes replace all coils when only the front bank detection circuit is affected, but the rear bank has a separate circuit and its own related code.
  • Aftermarket spark plugs with the wrong heat range or gap can change the ionization voltage enough to trigger P1316 even though the engine runs smoothly.
  • The PCM may set P1316 intermittently when battery voltage is low during cranking, so always check the battery and charging system before chasing ignition faults.

Can I keep driving with P1316?

You can usually drive short distances to a repair shop, but avoid heavy acceleration and prolonged driving if the check engine light is flashing. A persistent misfire can overheat and damage the catalytic converter, so schedule diagnosis soon.

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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