- May 16, 2026
- 4
- 1
Hi everyone,
I just bought a used 2025 Colorado ZR-2 w/just 3200 miles yesterday.
She's in mint condition w/o a scratch and the original owner traded her in due to wanting a bigger truck, which he bought.
I went and christened her offroad yesterday, testing everything doing so w/the only major issue being the Front and Rear lockers not staying locked.
The transfer case worked OK, both switching into 4Hi while driving or at a complete stop, and 4 Lo, switching it at a complete stop w/the transmission in Neutral.
Next comes the Lockers, when I went and switched the Rear Locker in at 4Hi, while moving slowly, the indicator would show it locked in, sometimes taking a few seconds to do so, and for a short period of time driving, worked, but then all of a sudden, it would kick back out into 2Hi. Tried it either at a complete stop, and while slowly moving. Tried it several times, no changes there.
Next with the Front and Rear Lockers in 4Lo, it would Lock in after the indicator light flashed a few times, but not too soon after, while driving, either switch into the Rear Locker only, and then back into unlocked there entirely.
One time going downhill on some slippery gravel, it worked for a while, but not too soon afterwards, kick back out into unlocked.
Anything that I'm doing wrong here? I'm getting no error indicators if there are any to be shown.
Then there was the highway fuel mileage.
Driving on the highway w/my speed set at 70 mph in cruise, the mileage varied from a low of 13 mpg to a high of 18. It was windy, where it seemed run at 13 mpg, but once the wind died down, I got a high of 18.
From my research, I thought the ZR-2 got a high of 20 Highway. Once again, the truck has only 3200 miles on the engine, if that's broken in enough.
I don't know what engine oil was installed by the dealer.
I was running 91 Octane fuel, Chevron my preference.
Thanks
I just bought a used 2025 Colorado ZR-2 w/just 3200 miles yesterday.
She's in mint condition w/o a scratch and the original owner traded her in due to wanting a bigger truck, which he bought.
I went and christened her offroad yesterday, testing everything doing so w/the only major issue being the Front and Rear lockers not staying locked.
The transfer case worked OK, both switching into 4Hi while driving or at a complete stop, and 4 Lo, switching it at a complete stop w/the transmission in Neutral.
Next comes the Lockers, when I went and switched the Rear Locker in at 4Hi, while moving slowly, the indicator would show it locked in, sometimes taking a few seconds to do so, and for a short period of time driving, worked, but then all of a sudden, it would kick back out into 2Hi. Tried it either at a complete stop, and while slowly moving. Tried it several times, no changes there.
Next with the Front and Rear Lockers in 4Lo, it would Lock in after the indicator light flashed a few times, but not too soon after, while driving, either switch into the Rear Locker only, and then back into unlocked there entirely.
One time going downhill on some slippery gravel, it worked for a while, but not too soon afterwards, kick back out into unlocked.
Anything that I'm doing wrong here? I'm getting no error indicators if there are any to be shown.
Then there was the highway fuel mileage.
Driving on the highway w/my speed set at 70 mph in cruise, the mileage varied from a low of 13 mpg to a high of 18. It was windy, where it seemed run at 13 mpg, but once the wind died down, I got a high of 18.
From my research, I thought the ZR-2 got a high of 20 Highway. Once again, the truck has only 3200 miles on the engine, if that's broken in enough.
I don't know what engine oil was installed by the dealer.
I was running 91 Octane fuel, Chevron my preference.
Thanks
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