P0302 Code then....overheating. HELP!

[DodgeBruhBoy]

Hey whats up everyone,

I'm having a few issues and hoping someone can guide me on what to do next, I turned on the car last week and the engine vibrated for like 30 seconds and then a check engine light came on. It's a 2019 Dodge Journey SE 4cyl 2.4

 

I got 3 codes.

 

-P0302 CNF MD00

Cylinder 2 Misfire detected 

 

-P0302 PND M0D00

Cylinder 2 Misfire detected 

 

-P0302 PRM M0D00 

Cylinder 2 Misfire detected 

 

So I took it to my local mechanic and we replaced all 4 spark plugs, 2 were really bad. But a few days later the car started overheating after 30 mins of driving. I checked the radiator fan, and it comes on when the temperature is reached (approx 200-220), no smoking or etc. My dad and I also inspected the hoses for leaks, tears, all clamps and connections....no issue.  

 

Any ideas on what this could be or what we should check for next? 

[DodgeBruhBoy]

Forgot to mention...approx 74K miles, and no issues with the vehicle ever.

[2late4u]

your plugs should be changed every 30 k ,iles also only use OEM plugs they are cheap and easy to replace as far as the overheating exactly what happened how hot did it get? did you lose any coolant? probally you just need to replace the thermostat unit on your journey I believe there are 2 of them in the plastic unit as I have the 3.6 and it is a different type that is used instead of the 2.4 only use Mopar coolant when adding to your cooling system...good luck

[DodgeBruhBoy]

13 hours ago, 2late4u said:

your plugs should be changed every 30 k ,iles also only use OEM plugs they are cheap and easy to replace as far as the overheating exactly what happened how hot did it get? did you lose any coolant? probally you just need to replace the thermostat unit on your journey I believe there are 2 of them in the plastic unit as I have the 3.6 and it is a different type that is used instead of the 2.4 only use Mopar coolant when adding to your cooling system...good luck

 

We did use the OEM spark plugs (copper), as for how it happened it just popped up. We were just driving a few days later and the overheating sound and dashboard light came on. I pulled over and waited 20 minutes and drove it home. As soon as I got on to the block, the over heating light came on again. The car runs and drives fine with no issue, but as soon as it gets to 25-30 mins.....over heats.  But just to clarify there is no leaks, smoke, loose connections or etc.

[5rebel9]

I'm not sure which size engine is in your car. IF a 4 cyl, then a possible stuck shut thermostat{it has 2}. BUT I also suspect you may have a blown head gasket.

[Dean H]

2016 DJ, Code definition

2.4L engine.

 

P0302-CYLINDER 2 MISFIRE

When Monitored and Set Conditions.

 

When Monitored: This diagnostic runs continuously when the following conditions are met:

 

• The engine is running.

• The adaptive numerator has been successfully updated.

 

Set Conditions:

 

• The Powertrain Control Module (PCM) detects that the variation in crankshaft speed between each cylinder exceeds a calibrated value, based on engine rpm and load.

 

The Powertrain Control Module (PCM) detects that the variation in crankshaft speed between each cylinder exceeds a calibrated value, based on engine rpm and load

 

Default Actions:

 

• The MIL light will illuminate.

 

POSSIBLE CAUSES

 

FUEL DELIVERY SYSTEM

 

IGNITION COIL, WIRING, OR CONNECTORS

 

ECT SENSOR, WIRING, OR CONNECTORS

 

MAP SENSOR, WIRING, OR CONNECTORS

 

02 SENSOR, WIRING, OR CONNECTORS

 

ENGINE MECHANICAL SYSTEM

 

POWERTRAIN CONTROL MODULE (PCM)

 

2. DIAGNOSTIC INSPECTION

 

NOTE: Anything that affects the speed of the crankshaft can cause this DTC to set.

 

NOTE: When a misfire is detected, the PCM will shut down the injector control circuit for the misfiring cylinder.

 

NOTE: Misfire may occur and may not be caused by component failure. Any of the following conditions can cause a misfire:

 

Worn serpentine belt.

 

Misalignment or binding water pump, P/S pump or A/C compressor pulleys.

 

Improper CKP, CMP, MAP, or TPS Sensor mounting.

 

Poor connector/terminal to component connection for CKP sensor, CMP sensor, MAP sensor, TPS sensor, fuel injector, ignition coil, etc.

 

Corroded PCM power or ground circuits.

 

Vacuum leaks.

 

Restriction in the air induction or exhaust system.

 

Internal engine component malfunction.

 

Moisture on ignition system components.

 

Insufficient fuel.

 

Low quality fuel.

 

Manual transmission bog.

 

Towing overload. 

 

[DodgeBruhBoy]

22 hours ago, 5rebel9 said:

I'm not sure which size engine is in your car. IF a 4 cyl, then a possible stuck shut thermostat{it has 2}. BUT I also suspect you may have a blown head gasket.

It's the 4cylinder 2.4L model, and I'm REALLY hoping its not a blown head gasket.  Any signs I should look for if its a blown head gasket?

Edited Monday at 07:25 PM by DodgeBruhBoy

[DodgeBruhBoy]

19 hours ago, Dean H said:

2016 DJ, Code definition

2.4L engine.

 

P0302-CYLINDER 2 MISFIRE

When Monitored and Set Conditions.

 

When Monitored: This diagnostic runs continuously when the following conditions are met:

 

• The engine is running.

• The adaptive numerator has been successfully updated.

 

Set Conditions:

 

• The Powertrain Control Module (PCM) detects that the variation in crankshaft speed between each cylinder exceeds a calibrated value, based on engine rpm and load.

 

The Powertrain Control Module (PCM) detects that the variation in crankshaft speed between each cylinder exceeds a calibrated value, based on engine rpm and load

 

Default Actions:

 

• The MIL light will illuminate.

 

POSSIBLE CAUSES

 

FUEL DELIVERY SYSTEM

 

IGNITION COIL, WIRING, OR CONNECTORS

 

ECT SENSOR, WIRING, OR CONNECTORS

 

MAP SENSOR, WIRING, OR CONNECTORS

 

02 SENSOR, WIRING, OR CONNECTORS

 

ENGINE MECHANICAL SYSTEM

 

POWERTRAIN CONTROL MODULE (PCM)

 

2. DIAGNOSTIC INSPECTION

 

NOTE: Anything that affects the speed of the crankshaft can cause this DTC to set.

 

NOTE: When a misfire is detected, the PCM will shut down the injector control circuit for the misfiring cylinder.

 

NOTE: Misfire may occur and may not be caused by component failure. Any of the following conditions can cause a misfire:

 

Worn serpentine belt.

 

Misalignment or binding water pump, P/S pump or A/C compressor pulleys.

 

Improper CKP, CMP, MAP, or TPS Sensor mounting.

 

Poor connector/terminal to component connection for CKP sensor, CMP sensor, MAP sensor, TPS sensor, fuel injector, ignition coil, etc.

 

Corroded PCM power or ground circuits.

 

Vacuum leaks.

 

Restriction in the air induction or exhaust system.

 

Internal engine component malfunction.

 

Moisture on ignition system components.

 

Insufficient fuel.

 

Low quality fuel.

 

Manual transmission bog.

 

Towing overload. 

 

Thank you for sharing, I appreciate that. I'll review everything and report the results soon. 

[5rebel9]

1 hour ago, DodgeBruhBoy said:

It's the 4cylinder 2.4L model, and I'm REALLY hoping its not a blown head gasket.  Any signs I should look for if its a blown head gasket?

Being the 4 cyl. the easiest way is to pull the spark plugs again and compare #2 plug to the other 3 looking for tip damage or clean wash compared to slight darkening of the others.

I learned this "trick" WAY BACK in my YOUTH.

IF all look the same, then you may have a coil going out and a stuck shut T-stat.  I would suggest replacing BOTH stats at same time.

[DodgeBruhBoy]

6 hours ago, 5rebel9 said:

Being the 4 cyl. the easiest way is to pull the spark plugs again and compare #2 plug to the other 3 looking for tip damage or clean wash compared to slight darkening of the others.

I learned this "trick" WAY BACK in my YOUTH.

IF all look the same, then you may have a coil going out and a stuck shut T-stat.  I would suggest replacing BOTH stats at same time.

Ok, thank you very much for the response. Ill check tomorrow when I get in.