2006 Chevy Colorado "loss of power" light comes on, shuts truck off nearly ever 8-10 minutes...
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Highly likely...
This doesn't look unreasonable:
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I've been doing some digging - recommend you try to get your existing PCM reprogrammed. ROM in these boxes is actually EPROM (electronically reprogrammable ROM), so if its only a corrupted data load (cross fingers), maybe the programming can be restored.
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Another day... Wednesday... Did another "hard reset" on the PCM module after I took off to get numbers off back for replacement. They said disconnect negative cable, then turn headlights on... I assume this would drain some type of capacitior in the PCM? Cleaned (contact cleaner) 3 plugs "again" and re-seated them... Tried re-learn again and the PASSLOCK light stayed "solid" ON the whole time and never went off after 10-11 minutes as everyone said it would! Still I continued the on/off procedure and the truck started, the light never blinked, not went off with the ignition on... Is the PASSLOCK chip in the round ignition black part or in the key tumbler end under the metal cover? I ask only because I never had a PASSLOCK issue till I put in the new complete ignition assy. at $102... I can swap it back out... Thoughts?
Still have P0449 (vent blah blah code)... The "sum error code" ONLY comes on when the truck shuts off while driving... I'm going ahead with the PCM module... Ebay has a wide array of them from $119 (with 17 years of reb'd experience) to many at $149! Is one better than other? The $119 states they get takeoffs and reprograms them and else to you VIN number... There is no core charge or return w/1 year warranty... The $149 ers it depends! Thoughts? Do I need to think BCM also? Thanks again!
Joined
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53 Posts
Another day... Wednesday... Did another "hard reset" on the PCM module after I took off to get numbers off back for replacement. They said disconnect negative cable, then turn headlights on... I assume this would drain some type of capacitior in the PCM? Cleaned (contact cleaner) 3 plugs "again" and re-seated them... Tried re-learn again and the PASSLOCK light stayed "solid" ON the whole time and never went off after 10-11 minutes as everyone said it would! Still I continued the on/off procedure and the truck started, the light never blinked, not went off with the ignition on... Is the PASSLOCK chip in the round ignition black part or in the key tumbler end under the metal cover? I ask only because I never had a PASSLOCK issue till I put in the new complete ignition assy. at $102... I can swap it back out... Thoughts?
Still have P0449 (vent blah blah code)... The "sum error code" ONLY comes on when the truck shuts off while driving... I'm going ahead with the PCM module... Ebay has a wide array of them from $119 (with 17 years of reb'd experience) to many at $149! Is one better than other? The $119 states they get takeoffs and reprograms them and else to you VIN number... There is no core charge or return w/1 year warranty... The $149 ers it depends! Thoughts? Do I need to think BCM also? Thanks again!
Joined
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53 Posts
So define ignition switch... The key lock (aluminum housing) or the black (2 screws) end w/wire plug? I have already swapped the black plastic housing w/contacts internal and "no change". If it's the aluminum housing then it's another job ahead... Thanks!
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I sure hope so! I ordered the PCM last night and they email to say it was the wrong VIN number for truck! I volleyed back & forth with 4 emails only to find they were at fault! Sent them BMV registration with VIN & sent photo of windshield plate and door post sticker! Man, this is a long journey!Keep you posted... Thanks!
Another interesting description of the P0601:
"Possible causes of OBD code P0601 GM: A code P0601 GM in most cases means the PCM has gone bad. This is possibly due to a short-circuit inside the PCM. Or, if you disconnect the wires/connector from the PCM while the battery is still connected, that may also cause this code. "
Having a bad/loose connection from the PCM (e.g. the wiring of the aftermarket remote starter) is a known cause of this problem.
"Possible causes of OBD code P0601 GM: A code P0601 GM in most cases means the PCM has gone bad. This is possibly due to a short-circuit inside the PCM. Or, if you disconnect the wires/connector from the PCM while the battery is still connected, that may also cause this code. "
Having a bad/loose connection from the PCM (e.g. the wiring of the aftermarket remote starter) is a known cause of this problem.
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53 Posts
Got my new PCM module today and installed... Followed procedure sent by company to the "T"... I reinstalled my new ignition switch (black plastic part)... The relearn for PASSLOCK "started" the truck after the 3rd 20 minute w/30 second off routine... The initial crank did NOT allow the truck to start... The 2nd it just sputtered... The light remains on still! I also now have a crankshaft position system variation not learned code 315? The PCM company says that a dealer will have to "hookup" to fix this! I am shocked and disappointed... I also still have PO449 emission vent valve issues. I am considering ordering the purge valve solenoid as they are not that expensive. Thoughts anyone?
Joined
·
53 Posts
Got my new PCM module today and installed... Followed procedure sent by company to the "T"... I reinstalled my new ignition switch (black plastic part)... The relearn for PASSLOCK "started" the truck after the 3rd 20 minute w/30 second off routine... The initial crank did NOT allow the truck to start... The 2nd it just sputtered... The light remains on still! I also now have a crankshaft position system variation not learned code 315? The PCM company says that a dealer will have to "hookup" to fix this! I am shocked and disappointed... I also still have PO449 emission vent valve issues. I am considering ordering the purge valve solenoid as they are not that expensive. Thoughts anyone?
Joined
·
53 Posts
Got my new PCM module today and installed... Followed procedure sent by company to the "T"... I reinstalled my new ignition switch (black plastic part)... The relearn for PASSLOCK "started" the truck after the 3rd 20 minute w/30 second off routine... The initial crank did NOT allow the truck to start... The 2nd it just sputtered... The light remains on still! I also now have a crankshaft position system variation not learned code 315? The PCM company says that a dealer will have to "hookup" to fix this! I am shocked and disappointed... I also still have PO449 emission vent valve issues. I am considering ordering the purge valve solenoid as they are not that expensive. Thoughts anyone?
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436 Posts
P0315 is common after a replacement of the PCM. Unfortunately a dealer or mechanic needs to do the CASE relearn procedure for you.
Have you determined if the loss of power issue is resolved at least?
I too would have expected the security light to stay out after the Passlock process.
Have you determined if the loss of power issue is resolved at least?
I too would have expected the security light to stay out after the Passlock process.
Which light is remaining on? The security light? or the CEL? Did you fix the wiring? Did you find the wire that gets cut to bypass the PASSLOCK system? If that wire is (still) cut, the truck will be fine, but the security light will always be on.
Since it started, the PASSLOCK system is not inhibiting the fuel injection system, so that is "good". You might have had no fuel in the system lines since it's been sitting for a few days (it drained back to the tank), which meant the starting attempts were bringing up fuel to the rail and then building up pressure.
The P0449 code is the vent valve, not the purge valve. The vent valve is back by the charcoal canister under the bed, by the gas tank. It's cheap as well - for the effort to remove it, might as well replace it - it tends to take a beating.
From the tech manual: "If the PCM detects the CKP system variation values are not stored in the PCM memory, DTC P0315 sets." So since this is a new PCM, the learning process has not been performed to adjust to the specifics of your truck, so this code would be expected. It's not really a "fix" - it's a tuning. The question I have is if only a dealer can do this...or can a local mechanic with the right scanner make a "house call" for a fair price. Or can you drive on this code to a local mechanic?
You're close to winning this battle!
Ken
Since it started, the PASSLOCK system is not inhibiting the fuel injection system, so that is "good". You might have had no fuel in the system lines since it's been sitting for a few days (it drained back to the tank), which meant the starting attempts were bringing up fuel to the rail and then building up pressure.
The P0449 code is the vent valve, not the purge valve. The vent valve is back by the charcoal canister under the bed, by the gas tank. It's cheap as well - for the effort to remove it, might as well replace it - it tends to take a beating.
From the tech manual: "If the PCM detects the CKP system variation values are not stored in the PCM memory, DTC P0315 sets." So since this is a new PCM, the learning process has not been performed to adjust to the specifics of your truck, so this code would be expected. It's not really a "fix" - it's a tuning. The question I have is if only a dealer can do this...or can a local mechanic with the right scanner make a "house call" for a fair price. Or can you drive on this code to a local mechanic?
You're close to winning this battle!
Ken
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