Thread: P1350 Code

Did you check that connection you pictured a few posts back? If not, check that. If it looks bad, resolder it and heat shrink it. If all else fails........i'd call the person who did your tune.

I'd call intense and walk through it with them. Or wait until tomorrow to see what Bill has to say about this issue. I think it is those hideous tails that are causing the issue. :hide:

Let's make sense of this and reason it out:
What leads you to think it's the plugs? Quickest way to find out is pull a couple and see if they look bad
Did you lay that #6 plug wire on the wiring for the upstream O2? Hmmm Just sayin.......
You are getting a P1350 code, what does AllData and the GM manuals say about this? I know I've suggested GM ESI (you can find it on google too) and use the diagnostic aids. Typically I find my answer in the aids and not the actual walk through.

Since we all know you are "too busy" (probably buffing your bumper) to look this up. I did the work for you. I typed that code into Google and read three quick things to come up with this.

DTC P1350 Bypass Line Monitor
Refer to Ignition Control, Knock Sensors.

Circuit Description
The Ignition ControlModule (ICM) sends signals that the PCM requires for fuel controland spark advance calculations. At the start of engine crank, the ICM controls spark advance (Bypass mode.) When the second 3X reference pulse is recognized by the PCM, the PCM applies 5 volts to the Bypass circuit, commanding the ICM to switch spark advance to PCM control(IC mode). An open in the IC circuit or a short to voltage in the Bypass circuit at startup will cause the PCM to monitor IC pulses during crank, when the ICM should be grounding the IC circuit. This condition will set DTC P1350. The engine may be started but will run on Bypass mode timing.

Conditions for Setting the DTC
The PCM monitors IC pulses during crank while Bypass mode spark advance is commanded

Action Taken When the DTC Sets
The PCM will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed.
The PCM will store conditions which were present when the DTC set as Freeze Frame and Failure Records data.
Conditions for Clearing the MIL/DTC
The PCM will turn OFF the MIL during the third consecutive trip in which the diagnostic has been run and passed.
The History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
The DTC can be cleared by using the scan tool.
Diagnostic Aids
Check for the following conditions:

Poor connection at the PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
Damaged harness. Inspect the wiring harnessfor damage. If the harness appears to be OK, disconnect the ICM, turn the ignition ON and observe a digital multimeter connected between the IC circuit and B+ while moving connectors and wiring harnesses related to the ICM. A change in voltage will indicate the location of the malfunction.
Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

Test Description
Number(s) below refer to the step number(s) on the Diagnostic Table.

This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed.

It tells you to check your wiring. Go do it.

ok q and a time for me lol

is that a L67 coil bracket? and wheres your icm ground bolted down? and why does it look like your missing a bolt in the bracket?

make sure its clean and free of rust and tight. maybe move it.

change it then, used junk yard parts rule.

well that will mess things up. solder them back together.