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Old 03-10-2007, 06:42 PM   #1 (permalink)
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Angry Check Engine Light on code:P0325

I was driving my 300C today, enjoying the nice weather, and all of the sudden my check engine light comes on! Ruined my day! I only have 8,500 miles on it!
I looked up the code and P0325 is : Knock sensor 1 circuit (bank 1).
How can the knock sensor go bad this quick?!

The only thing I can think of is the gas around here fouling it up. We have the ethanol mix here.

Has anyone had this problem?
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Old 03-10-2007, 07:34 PM   #2 (permalink)
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Lady, I could be wrong but I seem to remember reading in the manual that you should not run the ethanol mix gas..I don't have my manual in front of me so maybe someone else can confirm this for me
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Old 03-10-2007, 08:44 PM   #3 (permalink)
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Sorry to hear the code put a damper on your nice, sunny drive. I suppose a new sensor could go bad or maybe there is some lose wire. Regardless of the reason, the good news is that your vehicle is under warranty. I don't know if the ethanol fuel mixture would be the cause. We've been using that blend in Cali. for years. I just make sure to fill my 300c with 89 octane as recommended.

Good luck and let us know about your repair.

Last edited by bruno; 03-10-2007 at 08:46 PM.
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Old 03-11-2007, 09:40 AM   #4 (permalink)
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I hope it is not the gas. I live in MD too and I don't want to have that happen to me.
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Old 03-11-2007, 03:18 PM   #5 (permalink)
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Lady,

There are two ethanol formulas out there. Most states have a blend that contains 10% ethanol. That will not harm your vehicle.

On the other hand a few stations have an 85% blend. That blend should only be used in a flex fuel vehicle.
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Old 03-11-2007, 08:10 PM   #6 (permalink)
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Hello all,
I found out that the gas doesn't have anything to do with it. Here is some info I received.......

The code: P0325-KNOCK SENSOR 1 CIRCUIT
  • When Monitored: This monitor runs above 2000 rpm, under open throttle conditions. The high voltage test runs all the times the engine is running.
  • Set Condition: The High voltage fault will set at 4.8 volts. Two Trip Fault. Three good trips to turn off the MIL.
Possible Causes
(K42) KNOCK SENSOR NO.1 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
(K42) KNOCK SENSOR NO.1 SIGNAL CIRCUIT OPEN
(K942) KNOCK SENSOR NO.1 RETURN CIRCUIT OPEN
(K42) KNOCK SENSOR NO.1 SIGNAL CIRCUIT SHORTED TO (K942) KNOCK SENSOR NO.1 RETURN CIRCUIT
(K42) KNOCK SENSOR NO.1 SIGNAL CIRCUIT SHORTED TO GROUND
KNOCK SENSOR
PCM

from FSM:
Two knock sensors are used; one for each cylinder bank. When the knock sensor detects a knock in one of the cylinders on the corresponding bank, it sends an input signal to the Powertrain Control Module (PCM). In response, the PCM retards ignition timing for all cylinders by a scheduled amount.
Knock sensors contain a piezoelectric material which constantly vibrates and sends an input voltage (signal) to the PCM while the engine operates. As the intensity of the crystal's vibration increases, the knock sensor output voltage also increases.
The voltage signal produced by the knock sensor increases with the amplitude of vibration. The PCM receives the knock sensor voltage signal as an input. If the signal rises above a predetermined level, the PCM will store that value in memory and retard ignition timing to reduce engine knock. If the knock sensor voltage exceeds a preset value, the PCM retards ignition timing for all cylinders. It is not a selective cylinder retard.
The PCM ignores knock sensor input during engine idle conditions. Once the engine speed exceeds a specified value, knock retard is allowed.

So....hopefully the 3 good runs will do the trick...didn't have time to drive it today, I was out buying a 63' impala ss parts car to help with my restoration! (If anyone has any SS items for a 63', PM me!)

Hope this info helps anyone having the same code!
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