Powertrain, generic (extended)

P2345 Cylinder 10 Above Knock/Combustion Vibration Sensor Threshold

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2345 is the knock code for cylinder 10, the last cylinder of a V10, so it appears mainly on engines such as Ford's 6.8L Triton truck V10, the Viper V10 used by Dodge, and the V10s of BMW M5/M6, Audi and Lamborghini. It sets when the knock signal belonging to cylinder 10's firing window stays over the calibrated limit; the module then keeps that cylinder's spark retarded. On a heavily loaded truck V10, towing, heat and low-octane fuel make real knock more likely, while on high-revving sports engines valve train noise can be mistaken for it. No manufacturer was found that documents P2345 publicly, and GM and Saab use P0324 for the same situation. Misfire on cylinder 10 is reported separately as P0310.

Likely causes

High load, towing or high intake temperature with marginal fuel
Carbon deposits in cylinder 10
Valve train noise interpreted as knock

Symptoms

  • Check engine light on
  • Pinging when towing or climbing
  • Loss of power

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–4,000
Time0.5–8 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

knock sensorknock sensor wiringcylinder 10 combustion

Related codes

P2344P2346P0324P0330P0310

References: en.wikipedia.org, saabwisonline.com, en.wikipedia.org, law.cornell.edu.