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Trouble code libraryIgnition and misfires

P0325 Knock sensor circuit problem

Generic SAE definitionKnock sensor 1 circuit (Bank 1 or single sensor)

Drive gentlyYou can drive it, but take it easy and get it looked at soon – waiting usually makes the repair bigger.

Check this first

Have the wiring checked at the sensor first – the sensor sits on the engine and cooks its own connector.

What usually fixes it

In the order a good shop checks them. Typical total: $119–$575 at $130 an hour.

  1. Wiring or connector

    $119–$282

    Heat-damaged wiring breaks the signal.

  2. Knock sensor

    $248–$575

    The sensor fails and the computer pulls timing to be safe, so it feels flat.

Code titles are the generic SAE definitions. Prices are typical US parts and labor for a common car or light truck – a guide for judging a quote, not a quote. Always confirm a repair against the vehicle in front of you.

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The Trouble codes screen in Drive DTC: stored, pending and permanent counts, then C0040-13 explained in plain English with what to check first, likely fixes in order and typical cost ranges

More in Ignition and misfires

All 25 codes in this group
P0309Cylinder 9 misfire detected P0310Cylinder 10 misfire detected P0315Crankshaft position system variation not learned P0330Knock sensor 2 circuit (Bank 2) P0335Crankshaft position sensor A circuit P0340Camshaft position sensor A circuit (Bank 1 or single sensor)