P0700 on GMC vehicles
47 owner complaints filed with NHTSA about GMC vehicles mention P0700 (Transmission Control System (MIL Request)) - across 8 models. Below is where it shows up, by model and year.
Can you drive with it? P0700 itself is a messenger; drivability depends on the transmission code behind it. Erratic shifting means minimize driving.
Symptoms, likely causes in order and realistic repair costs are on the main P0700 page - they do not differ much by brand. This page shows what is specific to GMC: which models and years actually report it.
GMC models reporting P0700
The number next to each year is how many NHTSA complaints for that car mention P0700. Owners rarely quote trouble codes when complaining, so real occurrence is many times higher - use these numbers to compare years, not as totals.
What GMC owners report
“While entering the freeway at approximately 45 MPH not towing the rear wheels locked for a second, truck went into the Limp mood, and dash said reduce speed, service transmission. Dealer pulled codes, P0700 and P0747...the order says cause document #6998510."replace spacer plate, check balls and valve." Correction: DTC P0747 set Dealer told me the put the new updated valve in but I don't see that on the repair order? I asked about the GM extended warranty ( I think it's 10 years, 150,000 miles). they said it didn't apply to my vehicle?”2023 GMC Sierra 1500 · Jan 2026
“ECM - Engine System code P0700 and TCM - Transmission System code U0073. The truck went in to first gear and wouldn't go over 5 MPH on the highway. The dealer is saying it can't be replicated but it's happened multiple times to the vehicle in the past week. The truck was taken to the dealership and inspected but they claim nothing is wrong. The check engine light came on as well as the aforementioned codes.”2023 GMC Sierra 1500 · Nov 2025
P0700 on other makes
Makes with enough NHTSA reports of P0700 for their own page.
Counts are NHTSA owner complaints whose text mentions P0700 - owner-reported and unverified. Always confirm with a diagnosis of your specific vehicle.