Question about 2002 GMC Envoy XL

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I have a 2004 GMS Envoy xl that is putting out the codes P0136 (twice) and then P0606. What do they mean?

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P0136 - O2 sensor malfunction, Bank 1 sensor 2." Drivers side exhaust down pipe after the Catalytic converter O2 sensor needs to be replaced."

P0606 - Control Module Internal Performance " Internal PCM failure." Replace the PCM.
For Electronic Throttle Control applications, an internal PCM failure, or an ETC system FMEM condition exists. Repairing the other DTCs can fix the P0606.

Good luck and hope this helps, keep me posted. Be glad to know you got your GMC running 100% again.

Posted on Nov 13, 2009

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Find what a code means


Code 606 is for a problem with the engine computer.

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We have 5 codes, po141,po172,po606,po014,po016 on a 2004 gmc envoy xuv. Can you help.


Here is a brief description of the codes;
P0141 - rear O2 sensor
P0172 - system too rich
P0606 - PCM internal failure
P0014 - Camshaft phasing off
P0016 - Camshaft position and crankshaft position off

This going to require a qualified technician to diagnose. The PCM issue may require a reflash of its memory or a replacement.
The other codes could be related to each other. One suspect item is the camshaft position actuator, sometimes it gets clogged with oil and make it fail.

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I have a 2004 Gmc Envoy putting out a code of 0128 what does this mean?


It means the car has not reached operating temp. The computer wants the engine a certain temp so it can go into "closed loop" where it fine tunes the fuel mix for optimum economy and emissions. If it cannot reach that temp it sets that code. You either have a low coolant level or a stuck open/missing thermostat.

Jan 10, 2010 | 2002 GMC Envoy XL

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Diagnosis codes when on p0606,p0700,p0133,p0128,p0302,p0299 when on during an inspection of my car


Start with the first code first. The P0606 code essentially means the PCM has failed - more info @ http://www.obd-codes.com/p0606

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2004 gmc envoy code 0128


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