what causes loss of communication with transmission?

Asked by Jul 29, 2013 at 06:47 PM about the 2007 Chevrolet Cobalt

Question type: Maintenance & Repair

speedometer stoped working and it will not change gear. check engine light is on and it also indicates a problem with the power steering. I had a diagnostics test ran at auto zone and that's what it read loss of communication to transmission. what can cause this and how do I fix it?

5 Answers

hate to sound like a stuck parrot here on cargurus....but the black cable that connects to the chassis must be wirebrushed with a coarse wirebrush so that solid ground can be achieved...this connection must handle 300 cold cranking amps and also the delicate 750 mA of the ECU...so it is imperative this one be free of corrosion or anything what may cause "brown power" to happen creating an ECU failure~

5 out of 5 people think this is helpful.

get a NEW battery if five years old or older~ could mean trouble for your alternator and charging system as batteries will stop accepting a charge 10%/yr. get a good one NAPA, prestolite, Interstate....make us proud~

2 out of 2 people think this is helpful.

on a side note this connection when pulling the 300-700 cold cranking amps will "weld" the connection...just like an arc welder works...and will leave you with a corroded with electrical action (corrosion) to create this condition in the first place...normally it is alright as the ECU can see thru the corrosion to the good power, but varying amperages and voltages is the stuff ECU failures are made of~

2 out of 2 people think this is helpful.
100

i had the same problem disconnect the battery in the trunk for 30 minutes take out two fuses #25 10 amp and the 2amp above it replace them both then clean the fuse holder the computer is next to the fuse box check every wire in the connector by touching and moving it this is the fuse panel in the passenger side of the console when you are finished it will be fine

2 out of 2 people think this is helpful.

im haveing the same problem with no engine light on it says power steering and air bag service watch a couple movies to see if it will help did't back to sqaure one any anwsers

Your Answer

Add photo

Related Questions

Cobalt

Looking for a Used Cobalt in your area?

CarGurus has 4,809 nationwide Cobalt listings starting at $2,000.

ZIP:

Search Chevrolet Cobalt Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Chevrolet Cobalt Experts

#1 lightGear
lightGear
Reputation 1,080
#2 FordNut
FordNut
Reputation 1,060
#3 dandyoun
dandyoun
Reputation 900
View All

Related Models For Sale

Used Honda Civic
936 Great Deals out of 68,320 listings starting at $1,500
Used Chevrolet Malibu
1,126 Great Deals out of 82,799 listings starting at $1,800
Used Ford Focus
965 Great Deals out of 59,072 listings starting at $1,395
Used Ford Mustang
582 Great Deals out of 41,215 listings starting at $1,699
Used Chevrolet Impala
935 Great Deals out of 35,463 listings starting at $1,995
Used Honda Accord
1,081 Great Deals out of 76,805 listings starting at $1,395
Used Toyota Corolla
1,077 Great Deals out of 64,179 listings starting at $1,595
Used Nissan Altima
1,069 Great Deals out of 82,298 listings starting at $1,900
Used Toyota Camry
1,196 Great Deals out of 93,143 listings starting at $700
Used Pontiac G6
98 Great Deals out of 5,154 listings starting at $999
Used Dodge Charger
468 Great Deals out of 29,730 listings starting at $2,275

Used Cars For Sale

2010 Chevrolet Cobalt For Sale
28 Great Deals out of 868 listings starting at $2,499
2009 Chevrolet Cobalt For Sale
7 Great Deals out of 784 listings starting at $2,000
2008 Chevrolet Cobalt For Sale
863 listings starting at $2,900
2007 Chevrolet Cobalt For Sale
3 Great Deals out of 938 listings starting at $2,995
2006 Chevrolet Cobalt For Sale
911 listings starting at $2,395