P0700: Transmission Control System (MIL Request)
What Does P0700 Mean?
P0700 is a diagnostic trouble code indicating: Transmission Control System (MIL Request). This code relates to the transmission system. It has been reported in NHTSA complaints across 30 different vehicle models.
The automatic transmission is controlled by the TCM using input from speed sensors, temperature sensors, and pressure sensors. When the TCM detects a fault, it may activate limp mode (2nd or 3rd gear only). Shift solenoids are electromagnetic valves inside the valve body controlling hydraulic fluid flow. Modern transmissions use 4-8 solenoids in combination for each gear. Solenoid failures are often caused by contaminated fluid — worn clutch material and degraded fluid create varnish that sticks solenoids. Always check transmission fluid first: level, color (red/pink good, brown/black bad), and smell (burnt = internal damage). Transmission DTCs escalate fast — a $200 solenoid fix can become a $3000-$5000 rebuild if ignored.
Symptoms of P0700
- ⚠️ Check engine/transmission warning light on
- ⚠️ Harsh, delayed, or erratic shifting
- ⚠️ Transmission stuck in one gear (limp mode)
- ⚠️ No upshift or no downshift
- ⚠️ Transmission slipping
- ⚠️ RPM flares between shifts
Common Causes
- 🔍 Faulty shift solenoid
- 🔍 Contaminated transmission fluid
- 🔍 Wiring issue between TCM and solenoid
- 🔍 Valve body wear
- 🔍 TCM internal failure
P0700 Reports by Year
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"Two incidents occurred: 1) On 12-6-21, while travelling in the high speed lane, my wife's car shut down causing her to become stranded on the side of the highway. The first system report from the incident can be found attached as indicated permanent transmission codes of P0716 and P0700. Our body s"
— Honda Pilot owner, 12/06/2021
"I'VE HAD MY USED 2005 CHEVY EQUINOX FOR LESS THAN A YEAR AND HAVE NOT HAD ANY PROBLEMS WITH IT UNTIL YESTERDAY. I HAD DRIVEN 32 MILES TO VISIT A RELATIVE AND PARKED THE CAR FOR THE REST OF THE EVENING. THE FOLLOWING DAY, I WENT TO TAKE A RIDE WITH MY FAMILY, AND THE REDUCED ENGINE POWER AND CHECK "
— Chevrolet Equinox owner, 08/02/2014
"THE TIMING CHAIN AND GUIDES WENT BAD AT ONLY 110K MILES. AND IF IT WAS RECALLED LIKE THE 2009 CHEVY TRAVERSE WAS THEN I WOULDN'T HAVE HAD TO FIX IT. IT HAS THE SAME MOTOR. IT IS THE 3.6L MOTOR. BECAUSE IT IS THE SPORTS MODEL. IT WAS THROWING P0008 P0018 P0017 AND TWO TRANSMISSION CODES SO I BELIEVE "
— Chevrolet Equinox owner, 05/12/2020
Source: NHTSA Complaints Database
Most Reported Vehicles for P0700
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | GMC ACADIA | |
| 2 | CHEVROLET EQUINOX | |
| 3 | CHEVROLET MALIBU | |
| 4 | CHRYSLER 300 | |
| 5 | CHEVROLET TAHOE | |
| 6 | CHEVROLET CRUZE | |
| 7 | CHEVROLET CAMARO | |
| 8 | DODGE CHARGER | |
| 9 | CHRYSLER PACIFICA | |
| 10 | CHEVROLET TRAVERSE | |
| 11 | CHEVROLET COLORADO | |
| 12 | JEEP COMMANDER | |
| 13 | SUBARU OUTBACK | |
| 14 | GMC TERRAIN | |
| 15 | SUBARU FORESTER |
P0700 Reports by Vehicle
Detailed NHTSA complaint analysis for each vehicle model.
Diagnostic Tips
- Scan all modules, save freeze-frame data, and clear unrelated history codes before focusing on P0700.
- Confirm whether companion codes are present first; they often identify the root cause sooner than the headline DTC.
- Prioritize inspection around power train and the most common failure path for this code family.
- Perform a voltage-drop and continuity check on the affected circuit and verify 5V reference/ground stability under load.
- After each repair step, complete one drive cycle and verify readiness monitors instead of judging success after a quick idle test.
- If the code keeps returning on high-incidence platforms (for example GMC ACADIA), check TSB patterns and wiring/connector fitment before major part replacement.
Common Mistakes to Avoid
- ❌ Skipping freeze-frame review and losing the exact RPM/load conditions when the fault set.
- ❌ Replacing modules before checking grounds, voltage drop, and harness rub-through near heat/vibration points.
- ❌ Clearing P0700 and returning the car before monitors complete — this often creates repeat visits.
- ❌ Treating intermittent wiring or connector faults as permanent component failure without wiggle testing.
Frequently Asked Questions
What is a shift solenoid?
Can I drive in limp mode?
How much for solenoid replacement?
Can fluid change fix it?
Reported Repair Costs for P0700
Based on 7 owner-reported repair costs from NHTSA complaints.
⚠️ These are owner-reported costs, not estimates. Actual costs vary by location, labor rates, and root cause. Source: NHTSA complaints database.
What To Do Next
Possible Fixes
- 🔧 Replace shift solenoid or pack
- 🔧 Transmission fluid flush with manufacturer fluid
- 🔧 Repair wiring to transmission
- 🔧 Replace valve body
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.