Question about 2005 Gmc Sierra 2500 Hd Allison Automatic Transmission Shift

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Why does't my allison AT545 go into reverse?

The engine is warmed up the fluid levels are good and the pressure is good in the transmission. All of the forward gears work fine.

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Disconnect the battery . Take off the plugs on the trans and clean the connectors with electrical cleaner spray ck all the wires to make sure none are broken , put plugs back on , how long has this been going on could be bad reverse clutches r u pulling a lot of trailer weight around and backing up with it and lugging it ,it is not a tank if so ,

Posted on Jan 22, 2015

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Posted on Jan 02, 2017

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Related Questions:

1 Answer

Transmission fluid hose burst, fixed it, add fluid now the car won't move...


Two litres? Unless you are outside the USA, transmission fluid generally comes in quart containers. If you only added 2 quarts, yes, it's very possible the fluid level is low. However, you don't want to add too much. There should be a dip stick for checking fluid level. Run the vehicle until the engine is good a warm, about 15-20 minutes, and then check the fluid level. Add as needed. But remember, don't add too much. Add a little at a time, as you get close to full.

Feb 05, 2013 | 1999 Oldsmobile Alero

2 Answers

After transmission filter replacement the car lost reverse


Loss of reverse is a symptom of a failed transmission.

Oct 22, 2012 | 2006 Chevrolet Impala

1 Answer

ALLISON AT545 NO REVERSE


Shift solenoids on the valve body inside the transmission or the transmission control module will cause that if it's electrical. Clutch packs if it turns out to be mechanical.

Sep 23, 2012 | Cars & Trucks

1 Answer

1999 grand cherokee engine starts butwill not move in any of the gear selections. Scanned with autoenginuity scantool shows dtc codes p1767 and p1784


P1784 low reverse pressure switch sense circuit.
Start by checking fluid level and condition. then check electrical connections. if all ok, probably solenoid in the valve body assembly.

P1767 Transmission Relay Always On. Transmission Range Sensor Circuit Malfunction (PRNDL Input)

Start with the simple and Check your fuses and transmission fluid level, if the level is good and the condition of the fluid is good. There may be an issue with your solenoid or your transmission pump. You can check your pump buy checking your transmission fluid level with the engine not running and take note where the level is. Then start the engine and check the fluid level again, if the level has gone down. The your pump is good, if it does not go down. Then your pump has gone bad and your going to have to rebuilt the transmission or replace the pump.

You better of replacing the whole transmission of the pump has gone bad, since the low transmission fluid pressure would have worn out most for your clutches throughout the transmission.

Thank you for using Fixya and hope is just a simple Solenoid that has gone bad or a wire harness that has shorted out.

Nov 24, 2010 | 1999 Jeep Grand Cherokee

1 Answer

2000 Silverado 4x4 transmision problems 1. Will not go into reverse. 2. High pitched whine when put in gear. 3. When starting from stop, does not shift out of first gear until speed reaches 25 mph and rpm...


Before guessing at transmission problems, check the fluid level (car warmed up, engine running in Park on level ground) and have the PCM scanned for trouble codes FIRST.
Secondly, put a line pressure gauge (or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.500" boost valve (easy fix in pan)
Possible causes to your transmission issue:
1. Slow, slipping or no reverse: “lo-reverse” clutches are worn out, fluid leak in the reverse apply circuit, or broken sunshell. It is possible to remedy a fluid problem by removing the checkball from its cage in the case in the rear of the trans may help (must remove valvebody), or adding a high-viscosity additive such as Lucas Transmission additive or other seal restorer product. May also have worn boost valve (can replace in the pan).
2.1st and 3rd only, no 2,4 or R; sunshell is fractured or splines are sheared off. R&R. Try not to run or drive the car or further damage could result.
The transmission will default to max line pressure causing the whine you describe.
Thank you for using fixya and good luck.

Mar 24, 2010 | 2000 Chevrolet Silverado

1 Answer

I have a 1997 chevy 1500. The Trans (4l60e) is bad i think


Before guessing at transmission problems, check the fluid level (car warmed up, engine running in Park on level ground) and have the PCM scanned for trouble codes FIRST.
Secondly, put a line pressure gauge (or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.500" boost valve (easy fix in pan).
Slow, slipping or no reverse: “lo-reverse” clutches are worn out, fluid leak in the reverse apply circuit, or broken sunshell. It is possible to remedy a fluid problem by removing the checkball from its cage in the case in the rear of the trans may help (must remove valvebody), or adding a high-viscosity additive such as Lucas Transmission additive or other seal restorer product. May also have worn boost valve (can replace in the pan).
Soft shifting, gradual performance degradation: Poor line pressure rise due to leaking boost valve, clogged EPC filter screen, failing EPC solenoid, or worst case: leaky seals throughout. Transgo HD2-C kit fixes first two without removing trans. Seal restorer may fix last problem, but probably R&R. Also try a transmission flush with BG brand products (Firestone stocks it).
No movement in any gear: pump failure, or total loss of fluid. R&R, or refill pan and find the leak. If out of fluid, avoid running the engine until the trans is refilled to avoid pump damage. To check for pump failure, check fluid level with the engine off, then start the engine and recheck fluid level. If level does not go down when engine is running, the pump is broken.
1-2 or 2-3 shift is slow/soft above part throttle: Trans is on its way out. R&R
Good luck and start with checking your transmission fluid level. Thank you for using Fixya

Mar 16, 2010 | 1997 Chevrolet Suburban

1 Answer

I have no reverse on my 1998 chevey blazer 2x2


Before guessing at transmission problems, check the fluid level (car warmed up, engine running in Park on level ground) and have the PCM scanned for trouble codes FIRST.

Secondly, put a line pressure gauge (or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a 0.490 or 0.500" boost valve (easy fix in pan).

Slow, slipping or no reverse: “lo-reverse” clutches are worn out, fluid leak in the reverse apply circuit, or broken sunshell. It is possible to remedy a fluid problem by removing the checkball from its cage in the case in the rear of the trans may help (must remove valvebody), or adding a high-viscosity additive such as Lucas Transmission additive or other seal restorer product. May also have worn boost valve (can replace in the pan).

Good luck and this should be a easy fix unless it's your sunshell that has gone bad, and call around for a transmission shop you can trust.

Feb 03, 2010 | 1998 Chevrolet Blazer

2 Answers

I put in a used transmission into my 2000 gmc sierra 1500 4x4 why wont it shift into any gear and the shift indicator doesnt work now?


Hi there,

I would firstly suspect a problem with the Park/Neutral Position Switch, as this switch is connected directly to your dash gear indicator.


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1st test: attempt to START the engine in each of the following gears: P, R, N, D, 3, 2, 1 (or L, C etc).

1) Engine should start in P & N ONLY
2) Engine should NOT start in other gears

- If engine does not start in any gear, then ensure switch is connected properly.
- If engine starts in both P & N ONLY, then switch is working OK.
- If engine starts in P, but not in N....then switch requires correct alignment on the transmission.



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Should this still not resolve the problem, then you will need to have your local dealership access your vehicle's on-board diagnostics/trouble codes - this will immediately identify where the the fault lies (as all transmission electronics are monitored by the OBDII system).

Cheers,


"If this information has helped you in any way, please rate this solution"

Jan 27, 2010 | 2000 GMC New Sierra 1500

2 Answers

1998 dodge caravan 3.3 l L tranny slips in 1st and reverse


the first thing is to check the fluid level. engine on and in nutreal then check level and if thats not it have the bands adjusted inside the pan

Nov 20, 2009 | 1998 Dodge Grand Caravan

2 Answers

Car cuts out when reversing


this could possibly be a bad motor mount letting the engine rock to pinch hoses for vacume and or wiring . if you can watch the engine with the hood up and the car running with the brake peddle depressed and the parking brake on move the gear selector from D to R if automatic if manual let out the clutch just enough to put a little pressure on the engine and watch for excessive movement in the engine.

Aug 29, 2009 | 1993 Ford Festiva

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