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Discussion Starter · #1 ·
2003 2.4 Non-Turbo, getting persistent error P2305 Ignition Coil B Secondary Circuit.

Replaced Plugs
Replaced IGN Wires
Replaced Coil
Checked connections to coil, checked for bent or broken wires, bad pins, cleaned.
Swapped ASD Relay
Checked ground to engine

When you start the vehicle it is fine, after running for about 10 mins, it feels like there is a misfire on one or more cylinders, only getting the code above, no other code present. Not even the P30x misfire code. The issue doesn't appear until you drive, few miles then the misfires, turn the car off and start it up, runs fine for a little while. Few minutes then back again.

Any ideas other than an issue with the PCM?

I read several posts and even swapped in a new Crank Pos Sensor but same issue.

Any feedback is greatly appreciated.
 

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. . . 2003 2.4 Non-Turbo, getting persistent error P2305 Ignition Coil B Secondary Circuit. . . . .
The 4 cylinder engine uses a waste spark system. Plugs #1 and #4 fire together and #2 and #3 fire together. The opposite spark plug fires on its exhaust stroke and thus does not create an issue. I don't know which pair is considered A or B.

. . . .
Replaced Plugs
Replaced IGN Wires
Replaced Coil
Checked connections to coil, checked for bent or broken wires, bad pins, cleaned.
Swapped ASD Relay
Checked ground to engine . . .
P2305-IGNITION COIL #2 SECONDARY CIRCUIT-INSUFFICIENT IONIZATION
When Monitored: Engine Running.
Set Condition: If PCM detects that the secondary ignition burn time is incorrect or not
present an error is detected. One Trip Fault

Possible Causes
INTERMITTENT CONDITION
SPARK PLUG
IGNITION WIRE
IGNITION COIL OPERATION
IGNITION COIL


You have replaced all the components (other than PCM) which could contribute to the problem. Check the 2 primary control wires for rub through or short to ground or another wire. Check the electrical noise suppression (aka capacitor) wired into the system. Check splices S102 and S103 for corrosion, excessive resistance. See attached image.

Ignition Coil Wiring.gif

. . . .When you start the vehicle it is fine, after running for about 10 mins, it feels like there is a misfire on one or more cylinders, only getting the code above, no other code present. Not even the P30x misfire code. The issue doesn't appear until you drive, few miles then the misfires, turn the car off and start it up, runs fine for a little while. Few minutes then back again. . . .
This could be a heat related issue internal to the PCM. A connection or solid state device heats up and then starts to cause a problem. If this is the situation then replacing the PCM may be the only solution. Explore all other possible solutions before condemning the PCM.
 

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When you replaced the spark plugs, did you use Champion copper plugs, RE16MC (#443) gapped at 0.040 inches? The 2.4l runs best on these. There was a TSB revision to the plug and gap that may be different from the sticker under the hood.
 

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This is a link to a previous discussion of code P2305 from several years ago.

 

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As Allan points out, the PCM is not on the list of Possible Causes for P2305. An advanced scan tool could tell you if there has been any 'good trips' (making it intermittent problem) since the fault was set.
Otherwise, this is all a secondary (high voltage) ignition issue. On a scope, insufficient ionization would show up as a short spark burn line (secondary short to ground?).
Rule out the Possible Causes one-by-one.
Ign. coil #2 fires the #2 & #3 (middle two) cylinders.

 

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Discussion Starter · #6 ·
When you replaced the spark plugs, did you use Champion copper plugs, RE16MC (#443) gapped at 0.040 inches? The 2.4l runs best on these. There was a TSB revision to the plug and gap that may be different from the sticker under the hood.
The first set of plugs were NGK, the second set I tried are Champion but I believe they are platinum plugs and not the standard copper.
 
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