1996 chevy silverado has hard time starting. Put it on a computer and it told me (p1351 ignition control, circuit voltage high). What do i need to do to fix the problem?

not told is engine misfiring still,? (besides DTC errors)

1996, 350V8 engine, 5.7L new name today.
C1500 right with C in front? not K1500>?
VIN R coded Automatic trans.
1351 (no front letter told) why post DTC lacking full and complete DTC????
answering for USA spec, cars only me.
i get only 1 hit

Trouble Code: P1351 (5.7L V8 VIN R Auto)
ICM Ignition Control Circuit High Input so after replacing the part
we reset all DTC errors using the scan tool (a button on it)
and drive and see if it comes back or otere pop up.
if does p1351 again,
the wiring is bad to it.
the SM states this

• ICM control circuit is open, shorted to ground or shorted to B+
• ICM power circuit is open (check power from the ECM1 fuse)
• ICM is damaged or has failed
• PCM has failed

bad grounds to all that.
the ICM step 4 in the manual told you the ICM must be mounted
not just nakked(sic) ever but with thermal compound.
like seen on computers today,(called heat sink grease (SLANG)
MUST, OR IT OVERHEATS, FOR SURE, LIKE CLOCK WORK
BEST IS NEW DISTRIBUTOR THIS OLD. IMO
AND ALL Wiring to to it clean and tight , no rust or bad connections.
even loose fuse or one that is damaged, ENG1 and ECU1.


zzzzzzzzzzzzzzzzzzzzzzz

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lots of help in the link

https://www.google.com/search?q=citroen+P1351

..

its --ignition control module circuit high voltage
P1351 Chevrolet Ignition Control Module Circuit High Voltage

DTC P1351 Ignition Coil Control Circuit High Voltage
The enhanced ignition system uses the crankshaft position (CKP) sensor in order to provide a timing input to the control module. Ignition control (IC) spark timing for each cylinder is based on this input. The control module provides the ignition timing signal to the ignition control module (ICM) to control the ignition coil. Each timing pulse detected by the ICM allows it to energize the ignition coil. A large secondary ignition voltage is induced in the secondary coil by the primary coil. This high voltage is switched to the correct spark plug by the distributor.
This diagnostic trouble code (DTC) will set if the VCM- (vehicle control module ) detects an unusually high voltage on the ignition timing signal circuit.
Diagnostic Aids
Intermittent test -- If the connections and the harness check OK, monitor a digital voltmeter connected between VCM terminal C3 pin 9 and C4 pin 18 while moving related connectors and wiring harness. If the failure is induced, the voltage reading will change. This may help to isolate the location of the malfunction.
An intermittent may be caused by any of the following conditions:
?€¢
A poor connection

?€¢
Rubbed through wire insulation

?€¢
A broken wire inside the insulation
Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Wiring Systems.
Check out this guy's video on GM fuel pump electrical circuit diagnosis !

GM Fuel Pump Relay Testing

P1352 - Ignition Coil 'A' Primary Circuit Malfunction P1481 - Fan Secondary Low With High Fan On P1335 - Crankshaft Position Sensor P0180 - Fuel Temperature Sensor 'A' Circuit Malfunction

P1351 - IDM Input Circuit Malfunction/ Ignition Coil Control Circuit High Voltage P1350 - Fuel Level Sensor 'B' Intermittent/Bypass Line Monitor P0115 - Engine Coolant Temperature Circuit Malfunction

Ignition coil control circuit high voltage. P1351 Chevrolet Ignition Coil Control Circuit High Voltage

Your ICM ignition circuit may be open/failed or shorted, also check power from the PCM1 fuse, it may have failed

Four digit codes are brand specific, in your case code 1351 means the computer is finding high voltage in the control circuit for the coil which does go to the ICM. The ICM grounds the coil like a set of points once did.
My guess would be a faulty coil or a ground connection somewhere. The coil may be grounding thru the ICM instead of thru the block. Or the ICM ground is not strong enough to carry the current from the coil.

p0440 is a evap system code and p1351 isthe same code im getting ignition coil control circuit high voltage. im still trying to figure out why mine wont start. so far looks like a fuel pressure issue

No this is not a timing chain
P1351 CHEVROLET - Ignition Coil Control Circuit High Voltage

Conditions for Setting P1351:

The voltage on the ignition control circuit exceeds 4.9 volts, and the engine speed is less than 250 RPM.

Bottom line?

Most likely its a bad Ignition Control Module.