used pcm


Asked by Nov 16, 2014 at 08:10 AM about the 1999 Chevrolet Malibu LS

Question type: Maintenance & Repair

i have a 99 malibu 3.1 vin j which is
california emissions ive re placed all the
problem parts an the codse dont go away
im thinking its the computer do i have to
have a junkyard computer flashed? what
numbers have to match?

7 Answers


if you get a junkyard computer that works, you are lucky. the numbers have to match. really difficult. hope it works for ya!


vin nubers or computer numbers


Computer numbers. Have you tried a hard reset on the ECM?

1 out of 1 people think this is helpful.

no how do i do that


The best way to insure a complete reset is to remove a battery cable from the battery and electrically disconnect the ECM, but some ECM's are a bear to get to, so if you can't get to yours easily, then after you have disconnected a cable turn on the headlight switch and wait at least 30 seconds to 1 minute, turn off the headlight switch and reconnect the battery cable, set the park brake and apply regular brakes, start engine and place in drive, turn on all electrical ie headlights, heater fan, radio etc. Allow engine's idle to stablize, then turn everything off and look for a check engine light, if no light is present then drive as you normally would for about 20 minutes, this is a relearn drive cycle, at the end of the cycle if there is another problem the check engine light will turn on. If the check engine light turned on before the drive cycle then there is a cold hard fault that will have to be checked out before the drive cycle can be performed. Clear as mud, Right


ok i did a hard reset no light as of yet. hoping it stays away it kept trowing same 9 codes after i replaced problem parts all emmission codes, s.a.i.s., o2 heater, egr close performance, random miss, ect


Good that means that the ECM is functioning as it should if a check engine light did not come on during the relearn. Hope you got all the problems.

Your Answer

Add photo

Related Questions


Looking for a Used Malibu in your area?

CarGurus has 72,184 nationwide Malibu listings starting at $1,300.


Search Chevrolet Malibu Questions

Chevrolet Malibu Experts

#1 tenspeed
Reputation 1,820
#2 T_S_T
Reputation 1,450
#3 Tom Demyan
Tom Demyan
Reputation 1,120
View All

Related Models For Sale

Used Chevrolet Impala"
891 Great Deals out of 35,538 listings starting at $795
Used Honda Accord"
1,282 Great Deals out of 78,152 listings starting at $1,395
Used Nissan Altima"
1,397 Great Deals out of 87,430 listings starting at $1,195
Used Toyota Camry"
1,597 Great Deals out of 97,672 listings starting at $895
Used Nissan Maxima"
449 Great Deals out of 23,905 listings starting at $1,500
Used Hyundai Sonata"
977 Great Deals out of 51,509 listings starting at $1,200
Used Chevrolet Camaro"
813 Great Deals out of 39,041 listings starting at $2,650
Used Honda Civic"
1,133 Great Deals out of 57,877 listings starting at $1,295

Used Cars For Sale

2017 Chevrolet Malibu LS For Sale
7,239 listings starting at $15,168
2016 Chevrolet Malibu LS For Sale
45 Great Deals out of 4,477 listings starting at $15,395
2015 Chevrolet Malibu LS For Sale
31 Great Deals out of 888 listings starting at $11,989
2014 Chevrolet Malibu LS For Sale
30 Great Deals out of 867 listings starting at $8,900
2013 Chevrolet Malibu LS For Sale
63 Great Deals out of 1,547 listings starting at $8,500