Carlexica

P0700: Transmission Control System (MIL Request)

A generic powertrain (engine and transmission) trouble code, same meaning on every brand.

Fix within weeks

P0700 itself is a messenger; drivability depends on the transmission code behind it. Erratic shifting means minimize driving.

$80 - $900
typical repair range
256
NHTSA complaints mention this code
93,000
median mileage when reported, mi

Symptoms

  • Check engine light with transmission symptoms
  • Harsh, delayed, or missed shifts
  • Transmission stuck in one gear (limp)

Likely causes, most common first

  1. Any fault stored in the transmission control module
  2. Low or degraded transmission fluid
  3. Shift solenoid or sensor faults inside the transmission

Read P0700 yourself before paying for diagnosis

A basic Bluetooth OBD-II scanner ($20-40) plugs into the port under the dashboard and shows this code with live sensor data on your phone - useful both for confirming the fix and for talking to a shop from an informed position.

What is going on and how it gets diagnosed

P0700 carries no diagnosis of its own - it is the transmission computer raising its hand to say it has stored codes of its own. The engine module turns on the light; the actual story lives in the transmission module.

Any scan that stops at P0700 is incomplete: insist on transmission-module codes. Meanwhile the humble fluid check remains the highest-value first step for any shifting complaint - level, color, smell.

Repair options and cost

TCM code readout (the real diagnosis)$80 - $180
Fluid service$150 - $400
Solenoid replacement$300 - $900

Typical US independent-shop ranges, parts and labor. Dealers run higher; regional labor rates vary.

Owner reports mentioning P0700

“Was driving on highway when all of the lights on my dash illuminated. Eventually I got a warning for oil at temp alarm. Was giving code P2757 and P0700. Looks like this a common issue in Subarus but doesn't look like it covers anything after 2020.”2021 Subaru Crosstrek · Jul 2026
“An internal transmission Output Shaft Speed Sensor (OSS) failure causes the vehicle to enter "limp mode" and shift violently, creating a risk of rear-end collisions or loss of control, according to the report. A GM dealer confirmed diagnostic codes P0722 and P0700, isolating the issue to an internal component after an inspection of the external wiring harness.”2022 Chevrolet Silverado 1500 · Jul 2026
“Had issues transitioning to reverse, drove vehicle to the dealership. While driving on a busy road vehicle went into limp mode and had to pull over. Vehicle needed to be towed to the dealership. Dealership was able to verify vehicle was unable to reverse. They also found P0700 and P0776 error codes. They also used service bulletin 22-NA-258. We had not noticed excessively harsh shifting prior to this event. Had to replace components in the valve body”2022 Chevrolet Tahoe · Mar 2026
Show 7 more owner reports
“Will pulling camper, truck lurched with hard shift at around 35mph and caused a sudden slow down in traffic. Truck then went into limp mode with engine light illuminated. Pulled over to turn vehicle off and restart. Attempted to gain speed again and similar lurch with hard shift at around 35-40mph. Vehicle again in reduced power mode. Was able to ease truck to dealer where code reader showed P0700 and P0747. This was similar to issue found in recall for model years 2020-2022 with GM 10L1000 transmissions. There has been a technical service bulletin issue by GM regarding models years 21-25 but no recall. Dealer has ordered parts for TSB but repair not performed yet.”2023 Chevrolet Silverado 2500 · Feb 2026
“2017 Buick envision failed an annual smog check with OBD trouble codes: P0700; P2535; and U0100. P0700 is related to a transmission issue.”2017 Buick Envision · Jan 2026
“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
“Our vehicle experienced total transmission failure with no warning while I was driving on a narrow country road. The car shifted into neutral, and I was unable to go anywhere, so I sat in the middle of the road with hazard lights on in a state of panic. We had the car towed to a nearby Honda dealership and were informed of the transmission failure, which was identified through a diagnostic test. Codes that failed were listed as: P0730; P0700; P07A6; P07A8; P07A4. I have owned the car for one year and three months (purchased October 2024 for $34,000). I am being told it is just past the power train warranty, and Honda is not offering any assistance in covering the repair cost - $10,000.”2022 Honda Passport · Jan 2026
“Car went to limp mode, hard shifting very suddenly. Transmission system failed. No reverse. Computer codes p0700 p0777 p18A1 inspected at Chevy service center and needs valve body replacement. No warnings, lights, alerts, hard shifts previously.”2022 Chevrolet Tahoe · Dec 2025
“- started shutting shutting off at while in drive. - started having reduced power - started idiling high while driving - initially there was no codes - last night I drove, I put in drive gear but it was delayed so I had to keep moving from park to drive for it to full go into drive - the codes came P0325 P0505 P0507 P0700 P1101 P2714 After I was driving up an incline the car stopped moving forward and started reversing backwards. One other independent shop advised they were able to produce but couldn't figure out the problem because no code were shown at the time. There has been many people having the same issues I started off with and I found the forum to file a report .”2019 Chevrolet Malibu · Nov 2025
“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

Cars that report P0700 most often

Based on mentions of this code in NHTSA owner complaints.

2008 GMC Acadia8 mentions in complaints2022 Chevrolet Silverado 15007 mentions in complaints2008 Buick Enclave4 mentions in complaints2006 Dodge Charger4 mentions in complaints2010 Chevrolet Equinox4 mentions in complaints2016 GMC Sierra 15004 mentions in complaints2005 Jeep Grand Cherokee4 mentions in complaints2006 Chrysler 300C4 mentions in complaints2008 Saturn Vue4 mentions in complaints2007 Suzuki Forenza4 mentions in complaints2016 Chevrolet Silverado 15004 mentions in complaints2024 Chevrolet Silverado 15004 mentions in complaints

Frequently asked questions

Can I drive with P0700?

P0700 itself is a messenger; drivability depends on the transmission code behind it. Erratic shifting means minimize driving.

How much does it cost to fix P0700?

Typical US repair costs range from $80 for the simplest fix (tcm code readout (the real diagnosis)) to $900 in the worst case. The right number depends on which cause your car has - see the causes list.

Definition per SAE J2012 standard nomenclature. Symptoms, causes and costs are editorial guidance - always confirm with a diagnosis of your specific vehicle.