u/puzzledman22

Bought new sierra 1500 elevation , every service done at the dealer. Never towed anything heavy, never off road.

Symptoms started around in 2024 transmission hot idle engine popped up - took it to the dealer and dealer replaces the valve module and shift lever under warranty .

Fast forward to last week same message popped up drive straight to the dealer but this time it was out of warranty they tore down the transmission unit and gave me a heavy qoute around 18k usd to overhaul and change valve head , few clutch and transmission lever.

Here’s where it’s stuck. The dealer says they can’t identify the cause even after the teardown and told me replacing these damaged parts is all thats possible from their side but im worried this will most certaily happen in another 10 or 15k miles
Have anyone gone through this ?

Back in 2024, I got a "Transmission Hot - Idle Engine" message. The dealer replaced the valve module and shift lever under warranty.

Last week, the exact same message returned. Now out of warranty, the dealer tore down the transmission and quoted 18k USD to overhaul it (valve head, clutch packs, shift lever).

Has anyone else dealt with this, or had success escalating a repeat issue like this to corporate? Maybe had similar issue but found the root cause ?

was driving on the highway recently when I hit a relatively small bump. Immediately after, the car lost complete electrical power and everything just went dark.

I called Maruti Roadside Assistance, and luckily, they arrived pretty quickly. After diagnosing the issue, he told me The ECU box had literally unplugged itself.

He plugged it back in, checked the holder, and assured me that everything is still in "factory state." His only advice? Try not to hit potholes or bumps at high speeds because there isn't really a permanent way to "lock" it down further.

Has anyone else dealt with this? It feels like a massive safety issue if a some bumps can just disconnect the brain of the car. Is there a way to secure it better, or is this just a known quirk I have to live with?

Mileage- 7k kms

Model - 2024 full option AT

Never went heavy off roads or abused the vehicle the ways supposed to.

2023 Sierra 1500 (5.3, 10L80) — trans failed twice before reaching 39k miles