Gm p1351

unfortunately it could still be the icm. a bad connection, or a wiring short somewhere. Does your truck have long crank times to start? if so, It could be a fuel related issue. sounds crazy but it can happen. If you are having this issue it wouldn't hurt to check the fuel pressure to make sure it is within specs.

Possible causes p1351:>.......... - Faulty Ignition Control Module - Ignition Control Module harness is open or shorted - Ignition Control Module circuit poor electrical connection What does this mean? What does this mean? When is the code detected? The Powertrain Control Module (PCM) detects an open in the Ignition Control Module (ICM) Possible symptoms - Engine Light ON (or Service Engine Soon Warning Light) P1351 Gmc Description The Ignition Control Module (ICM) has independent power and ground circuits. The circuits between the ICM and the Powertrain Control Module (PCM) consists of the following circuits: -The ignition control (IC) timing signal -The IC timing control -The low resolution engine speed signal -The medium resolution engine signal -The camshaft position signal -The low reference The ICM sends 3X signals to the PCM, and controls the timing advance during engine cranking. The timing advance changes to PCM control after the following actions occur: The PCM receives the second 3X signal The PCM applies 5 volts to the ignition control (IC) timing signal circuit. The ICM monitors the CKP sync signal when the engine is cranking. The CKP sync signal is passed from the CKP sensor to the ICM on the CKP sensor 2 signal circuit. The CKP sync signal is used to determine the correct cylinder pair and initiate the ignition coil firing sequence. The 18X reference pulses are passed from the CKP sensor to the ICM on the CKP sensor 1 circuit. The 18X reference pulses are used for fuel injection and ignition control. After the ICM receives both signals, the ICM passes the 18X and 3X reference signals to the PCM. The CMP and the CKP sensors share a 12 volt reference and low reference circuit. The CKP sensor consists of the following circuits: -A 12 volt reference -A low reference -A CKP sensor 1 signal -A CKP sensor 2 signal

just thought I would ad that the reason the fuel could be an issue is if the truck wont hold fuel pressure then it is a leaky injector causing longer crank times co clear out excess fuel. this can cause a false 1351 code. If that's not the issue the I think rowe covered just about everything else!

So I would start by checking grounds.

And nothin wrong with verifying the fuel pressure as mike suggests. 56 to 63 lbs it should be..

fuel pressure should "hold" for a while key off. I bet you are on the right track though a bad ground could also throw that code.

Thanks for the help guys I'll get to checking some stuff out it doesn't take long to start might be a loose ground or something

This is don I have no answers I got a 1996 gmc 1500 4x4 5.0 got fuel just put new pump in and strider injectors and ing control moguls and map sensor still starts and dies any answers

Well I think i resolved the problem wit a P1351 trouble code, ICM High Voltage!!! Ready??!!! Just under the contact of the distributor rotor was a small burnt pin-hole so the spark never got to the sparkplugs. There it is!

I got same issue replaced everything

Icm only thing ain’t checked is fuel pressure and cap n rotor but when I spray ether in intake it tries fire so I think it’s something fuel related idk but I need helpppppp corona got my Gm dealer closed I’m screwed

I’ve Got The Same Problem But Every Thing Is New Coil Module Map Sensor Distributor Fuel Pump And All But I’m Still Getting The Same Code But Like Tommy Said I Can Poor Gas In My Intake And It Starts Right Up But Dies Right Back

Could my 1998 Chevrolet Silverado throwing both the code for bad gas cap and the cost for ignition control module high voltage be related somehow? I ask in the risk of sounding stupid only cuz I just read in this thread someone say not maintaining fuel pressure can cause the icm issue. Thank u