FLASHING D and R on trans selector ..help! - Chevy and GMC Duramax Diesel Forum
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post #1 of 10 (permalink) Old 11-18-2019, 03:48 PM Thread Starter
 
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FLASHING D and R on trans selector ..help!

I usually let truck warm up 10 mins or so before driving. This morning i didnt have that much time. Ran maybe 4 minutes at most. Got down the road 2 miles and went into neutral on its own and the D started Flashing on and off and it wouldnt move a bit. Switched to reverse and same thing. Let it sit for about 5 mins and started it and acted perfectly and drove it. Went home let it set 4 hours or so. Start it up after a little warm up 7 or 8 mins and runs perfectly. The temp here today was about 42 degrees F. Check engine light came on and i scanned it with my cheapo diag tool. showing codes 877, 848, 700. Thanks guys 919 438 4338

any suggestion or similar happen to anyone? please let me know thanks!

Raleigh NC
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post #2 of 10 (permalink) Old 11-18-2019, 03:59 PM Thread Starter
 
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2016 with 48k miles.
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post #3 of 10 (permalink) Old 11-18-2019, 04:07 PM
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Garage
High trans temp at sensor
Low trans pressure circiut
DTransmission Control System Malfunction

What causes the P0700 code?
Faulty transmission control module
Transmission valve body fault
Shift solenoid issues
Open or short in the wiring harness

What causes the P0848 code?
Some common causes of a P0848 trouble code include a faulty transmission fluid pressure sensor, bad electronic pressure control solenoid, and blockage within the hydraulic lines of the transmission. Mechanical failure of the transmission can also lead to the storage of this code by the PCM. Mechanical failure can result from a low fluid condition or dirty and contaminated fluid within the transmission. A low fluid condition or dirty transmission fluid can also cause the PCM to store the trouble code. Though rare, another culprit could be the PCM itself.

What causes the PO877 code?

Possible causes Faulty Transmission Fluid Pressure Sensor/Switch 'D'
Transmission Fluid Pressure Sensor/Switch 'D'
harness is open or shorted
Transmission Fluid Pressure Sensor/Switch 'D' circuit poor electrical connection


Not a mechanic, just mechanically maligned.

2016 Chevy Colorado Z71 Trail Boss Duramax CCSB
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post #4 of 10 (permalink) Old 11-18-2019, 04:33 PM Thread Starter
 
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thx man. anyone else ever have or see this problem?
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post #5 of 10 (permalink) Old 11-19-2019, 03:04 AM
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Just went through something very similar except my tranny would not shift out of first gear.

Bad TCM.

09 GMC SLT Dually
Steel Gray Metallic
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post #6 of 10 (permalink) Old 11-25-2019, 11:28 PM
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Mine did this just today. CEL is still on. Got it home. I don’t have a scanner so into the Dealership for diagnosing and whatever. 2016 30,200 miles.

Ken
2016 Silverado 2500HD LTZ 4x4 Crew cab
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post #7 of 10 (permalink) Old 11-30-2019, 04:32 PM
 
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Quote:
Originally Posted by KenW56148 View Post
Mine did this just today. CEL is still on. Got it home. I donít have a scanner so into the Dealership for diagnosing and whatever. 2016 30,200 miles.
Mine did it today. Had 3 stops at stores came out of the last one and wouldnt go into gear forward or reverse. Had to have it towed to the dealer. Truck only has 8k on it.

cdfinney
2018 GMC 2500 denali
Duramax
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post #8 of 10 (permalink) Old 12-03-2019, 12:52 PM
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Update: Dealerships tech stated found fluid low. No leaks. Apparently I have not checked fluid properly...... according to them. (Big note of non OEM filter on vehicle).

Ken
2016 Silverado 2500HD LTZ 4x4 Crew cab
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post #9 of 10 (permalink) Old Today, 09:12 PM
 
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Quote:
Originally Posted by cdfinney View Post
Mine did it today. Had 3 stops at stores came out of the last one and wouldnt go into gear forward or reverse. Had to have it towed to the dealer. Truck only has 8k on it.
Slight update as the dealers diesel techs had some days off. It looks like the issue is internal to the transmission. The dealer has already floated the idea of a new one. Supposedly was taken apart today, but never heard back.

cdfinney
2018 GMC 2500 denali
Duramax
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post #10 of 10 (permalink) Old Today, 09:52 PM
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Happened on mine in the first 10K miles. They rebuilt the pump on the Allison. Up to 70K now and it has never happened again.

2017 Sierra 2500HD Denali Dmax
2011 Silverado 3500HD Dually Dmax
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