P0351 (M) Ignition Coil #1 Primary Circuit Peak Primary circuit current not achieved with maximum dwell time.

Truck was running a little rougher than usual. Pulled this code as well as P1281 Engine Is Cold Too Long Engine coolant temperature remains below normal operating temperatures during vehicle travel (thermostat).
It's got a new radiator, 180* therm. a new water-pump-to-intake hose... also has a modded kegger, as well as a few other things.... any ideas guys?

 

SYMPTOM
P0351-IGNITION COIL # 1 PRIMARY CIRCUIT

WHEN MONITORED
With battery voltage greater than 8 volts during engine cranking or greater than 12 volts with engine running, engine rpm less than 2016 , and none of the Coils in dwell when checked.

SET CONDITION
Peak current is not achieved with battery based dwell plus 1.5 msec of diagnostic offset. It takes less than 3 seconds during cranking or up to 6 seconds while running to set.

POSSIBLE CAUSES


Intermittent condition
ASD relay output circuit
Ignition coil resistance
Ignition coil
Ignition coil driver circuit open
Ignition coil driver circuit shorted to ground
PCM

 

 

as for the p1281, check for proper coolant level. if that is good, then it is either your coolant temp senser ,or the engine really isnt warming up, youll have to look at other systems to figure out why.

SYMPTOM
P1281-ENGINE IS COLD TOO LONG

WHEN MONITORED
The ignition key ON, engine running.

SET CONDITION
The engine does not warm to 176 deg. F while driving for 20 minutes after start.

POSSIBLE CAUSES


Engine cold too long

 

Hmm. Thanks for the informative replies, I'm kind of confused... the coil is only 20 bucks from O'reilly, maybe I will replace it and see if that helps... that stuff about the pcm is kinda spooky.

 

Huh, just found that I'm also rocking a p0141 and a p0161,and I found a post of steve's where he appeared to have the same codes... https://dodgeforum.com/forum/2nd-gen...-failures.html

Wonder if it's because I'm only running the two upstream sensors.... I should probably pull the ProFlo Edelbrock if it might backfire through the TB... Fire=BAD.

 

the tests for the p0351 are really simple, you can do all of them with a multimeter. it isnt complicated when you get in there.