Transmission Control System Malfunction
The P0700 code means the vehicle's onboard diagnostic system has detected: Transmission Control System Malfunction. This is a serious severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- medium
- Estimated cost
- $50-$200 for solenoids; $500-$3,500 for transmission rebuild
Common Misconceptions / Fact Check
-
Commonly claimedP0700 tells you exactly what is wrong with the transmission.
VerifiedIt does not. P0700 is only a general flag that the transmission control module has stored a fault and turned on the light. The actual fault is in the companion code (for example a P07xx/P0Bxx); read those to diagnose it.
Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.
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Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.
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Common Symptoms
- Check Engine Light and transmission warning light on
- Harsh or erratic shifting
- Vehicle may be stuck in one gear (limp mode)
- Transmission slipping
Probable Causes (Ranked by Likelihood)
- Fault in the transmission control module (TCM) or its circuits High
- Hydraulic fault in the transmission (solenoid, pressure) High
- Wiring fault in transmission control circuit Moderate
- Low or contaminated transmission fluid Moderate
Step-by-Step Diagnostic Procedure
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P0700 is a generic indicator: it means the TCM has detected a fault and illuminated the MIL. Always scan for additional transmission-specific codes (P07xx range) which will identify the exact fault.
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Check transmission fluid level and condition. Dark, burnt-smelling fluid indicates serious wear.
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Inspect the transmission wiring harness at the transmission connector for damaged or corroded pins.
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With additional codes, diagnose the specific solenoid, sensor, or circuit identified.
Common Fixes by Vehicle
What techs usually find when diagnosing P0700 on specific vehicles — tap your vehicle for the fix and the exact part:
2007-2019 Dodge Ram/Charger/Chrysler 300 easy (sensor), hard (solenoid pack) DIY
P0700 is a generic transmission code -- you need to pull the specific trans codes (P07xx) with a scanner. On Chrysler/Dodge, the most common root cause is the transmission output speed sensor (Mopar 4800878) or solenoid pack failure. Check the ATF fluid condition first -- dark or burnt fluid indicates internal damage.
Labor: 30 min (speed sensor), 2 hours (solenoid pack)2010-2019 Chevrolet Equinox/GMC Terrain 2.4L/3.6L easy (fluid), hard (internal repair) DIY
P0700 on GM vehicles often accompanies P0717 or P0776. The 6T40/6T45 transmission has a known issue with wave plate failure causing a hard 1-2 shift. GM TSB #18-NA-025. Check for trans codes first. If the trans is slipping, a rebuild may be needed. Fluid change with ACDelco Dexron VI is a good first step if fluid is dark.
Labor: 30 min (fluid change)2005-2017 Nissan Altima/Pathfinder CVT easy (fluid), hard (CVT replacement) DIY
P0700 on Nissan CVT transmissions is a red flag for CVT failure. Nissan JATCO CVT units are known to fail around 80-120K miles. Check for shuddering and whining. Nissan extended the CVT warranty to 10 years/120K on some models. Check with the dealer before paying out of pocket. A CVT fluid drain and fill with NS-3 fluid can buy time.
Labor: 30 min (fluid drain and fill)2008-2019 Honda Accord/Civic CVT/Automatic easy (fluid) DIY
P0700 on Honda often points to the transmission range switch (Neutral safety switch) or a failed torque converter lockup solenoid. Pull the specific sub-codes first. Honda ATF-DW1 fluid is the only approved fluid -- do not use generic Dexron. A fluid drain and fill (3x3 method) often resolves early shift problems.
Labor: 30 min (fluid change)Frequently Asked Questions
Does P0700 mean my transmission is ruined?
Not necessarily. P0700 is a gateway code that just means a transmission fault exists. Read the accompanying specific codes. Many P0700 issues are caused by a single failed solenoid or sensor and are relatively inexpensive to fix.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P0700 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
See All Codes & Fixes for Your Vehicle
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