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My H3 wont shift out of first gear or go over 30 mph. Its…

Customer Question
My H3 wont shift...

My H3 wont shift out of first gear or go over 30 mph

Mechanic's Assistant: How old is the transmission? Have you checked the brake switch?

Its orginal trans no I haven't checked the brake switch

Mechanic's Assistant: What year is your H3?

06 Straight 5

Mechanic's Assistant: Are you fixing your H3 yourself? What have you tried so far?

Tried resetting it out of limp mode I did notice the trans fluid is very dark

Submitted: 8 months ago.Category: GMC
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Answered in 7 minutes by:
11/22/2017
GMC Mechanic: Gary, ASE Certified Technician replied 8 months ago
Gary
Gary, ASE Certified Technician
Category: GMC
Satisfied Customers: 18,019
Experience: GCM master tech over 25 years
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Welcome! My name is ***** ***** I will do my best to assist you with this problem.

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GMC Mechanic: Gary, ASE Certified Technician replied 8 months ago

does the speedometer work ?

is the check engine light on ?

are there any codes set in the computer ?

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Customer reply replied 8 months ago
The speedodmeter works fine there are a few codes
GMC Mechanic: Gary, ASE Certified Technician replied 8 months ago

can you tell me the code numbers ?

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Customer reply replied 8 months ago
p0461 p0455 p0300 p0128
GMC Mechanic: HDGENE, Master Auto Technician replied 8 months ago
HDGENE
HDGENE, Master Auto Technician
Category: GMC
Satisfied Customers: 6,588
Experience: Master Auto Technican
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Hello, how many miles are on this vehicle? Does the scan tool you are using have the ability to look at live sensor data? Does the check engine light flash when it looses power?

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Customer reply replied 8 months ago
Na it is just on it has around 90k miles on it the scan tool was at Oriely auto parts they did a scan for me. I just wanna know if its a possible tranny replacement or not
GMC Mechanic: HDGENE, Master Auto Technician replied 8 months ago

None of those codes shown are transmission codes. P0300 is the only code showing a random misfire. Its possible there is an issue with the transmission range sensor only reading its in manual first gear. This is where a scan tool will come in to diagnose it properly. If it thinks its in manual 1st instead of drive, it will not upshift and wind out in gear. Otherwise it can be due to a lack of fuel pressure/engine running lean or a clogged catalytic convertor. The first codes are for the evaporative emission system and the P0128 is for a stuck open thermostat. If the trans fluid looks badly burnt or black it can be related to the trans itself which would indicate the need for a major overhaul of the trans or a replacement.

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GMC Mechanic: HDGENE, Master Auto Technician replied 8 months ago

If you need more help please let me know. If I answered your questions please use the 5 stars above to leave a positive rating.

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GMC Mechanic: HDGENE, Master Auto Technician replied 8 months ago

Do you need more help with this concern?

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