How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask ironmike Your Own Question
ironmike
ironmike, ASE Master tech
Category: Chevy
Satisfied Customers: 3377
Experience:  30 years ASE Master L1 GM certified
11302663
Type Your Chevy Question Here...
ironmike is online now
A new question is answered every 9 seconds

2004 Chevy suburban 5.3 z 1500 Code 342 comes up History:

Customer Question

2004 Chevy suburban 5.3 z 1500 Code 342 comes up
History: 3 years ago 250k miles code displayed changed cam position sensor NO CHANGE
Now 400k miles changed engine and trans (used) NO CHANGE
Seems like it could be wiring connection
Submitted: 7 months ago.
Category: Chevy
Expert:  ironmike replied 7 months ago.
greetings, did you try to do a crankshaft relearn? did you check the wires for the cam sensor?
Customer: replied 7 months ago.
How to do crank relearn? Have different harness was going there last.
Expert:  ironmike replied 7 months ago.
crank relearn is easy to do with a scanner. I have never done the relearn without, let me see if I can find the procedure without a scanner.
Expert:  ironmike replied 7 months ago.
did not find a relearn procedure without a scan tool on the GM site. I did see procedures but they were for the monitors(drive cycle) If the wires for the cam sensor test good from the sensor to the PCM it would point to the PCM. You can take a multi meter and make sure there is no open wires or high resistance.
Expert:  ironmike replied 7 months ago.
​make sure the harness or wires for the cam sensor are not too close to the secondary ignition(coils).
Expert:  ironmike replied 7 months ago.
GM has several tests ,data for the sensor to watch that all point to circuit faults or the PCM. other causes are mechanical but since you swapped an engine I would say chances are very low.

Related Chevy Questions