Question about 2001 GMC Jimmy

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2001 jimmy no pcm communication

Obd port

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  • joe covelli Feb 20, 2012

    have eng lite on pcm there is no communicating with obd when pluged in to port

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Check the cigar fuse located in the fuse block in the drivers side fuse block ( on the end of the dash). Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

Posted on Feb 21, 2012

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Fuses are all fine. Also my rpms are jumping all crazy when I give it gas. And it jerks bad.

Posted on Jun 21, 2015

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Obd2 scan tool don't comunicate with the pcm, what to do?


Carlos, see if there is a fuse blown to the OBD2 port, the obd port some time shares with other accessories/things like cigarette lighter.
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02 sensor circuit low voltage ---answer is copied from obd-codes .com you can visit this site for more information if necessary Usually rear o2 sensor problems won't cause drivability issues since they are an input that measures catalyst efficiency (unlike front o2 sensors). However if you have other codes present, like lean codes or pre-o2 sensor codes, then they may cause drivability problems as well as P0143. The following symptoms may be present: MIL (Malfunction Indicator Lamp) illumination Engine performance issues Engine running rough Engine running rich (only if PCM is trying to add fuel to compensate for low o2 sensor voltage reading) Engine running lean (only if vacuum leak is large enough that PCM can't compensate by adding fuel) Poor idle Causes If you have reason to believe that your engine is running lean, fix that problem first, then clear codes and see if the P0157 code resets. An engine that is running lean could set this code, but usually there will be lean codes (P0171, P0174) present. The following could be causes: Air leaks in exhaust in front of o2 sensor giving false reading Engine running excessively lean O2 sensor connector damaged/corroded O2 sensor signal circuit is shorted to ground O2 sensor ground circuit is open O2 sensor has failed (it may be contaminated with fuel or coolant) PCM has failed

Read more at: http://www.obd-codes.com/p0157
Copyright © OBD-Codes.com

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1 Answer

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If your trying to retireve codes using the OBD II port and it says something like "unable to communicate" then you need to check the fuse. On most vehicles it is the same fuse as the one for a cigarette lighter or aux power port. If the fuse is good then the PCM might be failing.

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2001 Jimmy. Changed out the ECM, now it won't start. Anyone know the procedure to follow for afterwards of replacement?


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a blown fuse will also cause the obd to not communicate

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