Sponsored
sox3
Well-Known Member
- Joined
- Jun 2, 2019
- Threads
- 12
- Messages
- 979
- Reaction score
- 1,485
- Location
- Newark, Delaware
- First Name
- George
- Vehicle(s)
- 2019 GT 350 Performance Blue
Lots of posts on this, I'm sure others will chime in.
Found this on a search:
DTCs from the '16 Helm:
P0300 - Random Misfire Detected
Description: This DTC sets when the misfire detection monitor detects an engine misfire in multiple cylinders or the PCM cannot identify which cylinder is misfiring.
Possible Causes:
Damaged camshaft position (CMP) sensor
Low fuel (less than 1/8 tank)
Stuck open exhaust gas recirculation (EGR) valve
Restricted EGR passages
Misfire monitor neutral profile correction has not been relearned since the last mechanical repair
Diagnostic Aids: One or more EGR passages may be restricted.
(@honeybadger experienced this code -found it was due to a pinched/loose wire in a coil pack connector)
Found this on a search:
DTCs from the '16 Helm:
P0300 - Random Misfire Detected
Description: This DTC sets when the misfire detection monitor detects an engine misfire in multiple cylinders or the PCM cannot identify which cylinder is misfiring.
Possible Causes:
Damaged camshaft position (CMP) sensor
Low fuel (less than 1/8 tank)
Stuck open exhaust gas recirculation (EGR) valve
Restricted EGR passages
Misfire monitor neutral profile correction has not been relearned since the last mechanical repair
Diagnostic Aids: One or more EGR passages may be restricted.
(@honeybadger experienced this code -found it was due to a pinched/loose wire in a coil pack connector)
kyle7000
Well-Known Member
- Thread starter
- #3
@honeybadger how did you find out what was causing it? My dealership said I need a new harness which sounds a little bizarre.
Postal Bob
Well-Known Member
- Joined
- Dec 28, 2020
- Threads
- 7
- Messages
- 700
- Reaction score
- 781
- Location
- Long Island, NY
- First Name
- Bob
- Vehicle(s)
- 2019 Shelby GT350
Because for a dealer, replacing the whole harness is easier and faster than trying to track down which specific wire/connection is bad.
Sponsored
ice445
Well-Known Member
- Joined
- Apr 13, 2020
- Threads
- 34
- Messages
- 6,171
- Reaction score
- 7,346
- Location
- Salt Lake City, UT
- First Name
- Ryan
- Vehicle(s)
- 2020 Mustang GT 6MT
Start with Cylinder #2. Examine the coil connector carefully, make sure the pins are both seated equally in the connector and that there's no corrosion. Also make sure the wire integrity is solid as far as you can trace it back. Any tears in the insulation are bad obviously.
honeybadger
Just don't care
Sorry for the delay. Have been traveling to pick up an RV.
I traced the wires and found out it was a pinched wire that was shorting out right where it bends coming out of the connector.
If I had to guess, it’s likely the CPS wire being pinched (I’ve broken 3 and helped numerous others). It could also be the connector at the #2 coil. Either way, I’ll give it a 98% probability it’s the harness. I roll around with a spare now. Been through 3
I traced the wires and found out it was a pinched wire that was shorting out right where it bends coming out of the connector.
If I had to guess, it’s likely the CPS wire being pinched (I’ve broken 3 and helped numerous others). It could also be the connector at the #2 coil. Either way, I’ll give it a 98% probability it’s the harness. I roll around with a spare now. Been through 3