Car will not shift out low 3 not higher or lower

PENNYRITCHIE22

MEMBER
2007 CHEVROLET MALIBU
2WD
AUTOMATIC
140,000 MILES

Even when in drive it wont shift once approximately 55 cars rpm's are 3 1/2. And more depending how fast I go The side button on top of auto shifter wont click to change from the low 3 to low 2 or low 4 it just doesn't do anything. Where is TCM fuse located? Wheres TCM located? Is it difficult to change either of them?

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi.

I don't think the TCM is an issue just yet. I need to know a few things. First, when you place the shifter in D (not 3rd), does the indicator show D or does it stay in 3? Also, when you shift through the gears, does the indicator show all gears such as park, reverse and so on?

The TCM is an expensive component, so that is a last choice at this point. If the fuse was blown, it wouldn't be shifting. I have a feeling (only a theory at this point) that the transmission range sensor may be bad. This component is what tells the TCM gear selection.

Let me know about the indicator. Also, if you have had the computer scanned for diagnostic trouble codes, let me know what codes were found.

Take care,
Joe

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Monday, November 18th, 2019 AT 6:51 PM

PENNYRITCHIE22

MEMBER
2 POSTS

It shifts Park Reverse Drive& L3 will not go low 2 low 1. Or 4 only Stays in L 3 But Rpms are same whether I drive in D or In L3 Rpm s just stay higher and moter Will not shift. Above 50 mph or down shift when in passing lane have 2 different computer reads 1st done about month ago stated P0700 Transmission Conyrol System (Mil Request) P0974 Shift Solenoid A Control Circuit High. Now did Computet test again A few days ago and it red only this. Shorted or Open Circuit with in Tramsmission Control Module(TCM) & Failure of Transmission Control Mpdule (TCM) Thank You So Very Much For Takeing the Time To Help Me I Appreciate it More Then U Could Even Know or Imagine. God Bless U

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Tuesday, November 19th, 2019 AT 1:16 PM

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi again,

You are very welcome. I just hope to be able to help from here. What was the last code you got that indicated the TCM?

I'm not completely sure of the code you found, but if that is what it read, then I suspect the TCM is bad. However, before we jump to that conclusion, I want you to check the connector at the TCM to make sure it isn't corroded, loose, or have any damaged pins.

The TCM is located under the hood on the driver's side. It mounts to the frame rail. See pic 1.

Before you disconnect or reconnect the TCM, the battery must be disconnected. Failure to do that (if it's good) can damage the module.

Check that and let me know what it looks like.

Take care,
Joe

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