OBD-II Code · Transmission
P0700
Transmission Control System Malfunction
Severity
high
Left alone, this one tends to take other parts with it.
Can you drive it
Not for long
Driving on this one risks further damage. Get it to a shop rather than carrying on with it.
Indicative cost (USD)
$100–$3,500
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
General transmission system fault — a companion code should also be set to indicate the specific issue.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
- Transmission warning light
- Rough shifting
- Limp mode
Likely causes
- Low trans fluidMost common
- Failed solenoid
- Wiring issue
- Internal transmission damage
Read the full diagnostic procedureP0700 isn't really a diagnostic code in the traditional sense — it's a MIL request from the Transmission Control Module (TCM) telling the Engine Cont…
P0700 isn't really a diagnostic code in the traditional sense — it's a MIL request from the Transmission Control Module (TCM) telling the Engine Control Module (ECM) that the TCM has set its own code and wants the check-engine light turned on. You'll always find P0700 paired with a more specific transmission code (P0715, P0731, P0741, P0796, etc.) when you scan the TCM module directly, and a generic OBD-II scanner that only reads ECM codes will leave you blind.
The shop-floor rule on any P0700
pull out a bidirectional scanner that talks to TCM/PCM separately (Snap-on, Autel, OEM tools), or you're chasing ghosts. Before you touch anything electrical, check the transmission fluid level on a warm engine with the trans in PARK or NEUTRAL per the FSM — and look at the color and smell. Pink/red and clean smells like new ATF; brown and burnt-smelling means clutch material is in suspension and you have an internal problem regardless of what code paired with the P0700. A burned-fluid finding can save the customer a $200 solenoid swap that won't fix anything because the clutches are already cooked.
Vehicle-specific patterns2006-2010 Chrysler/Dodge with the 62TE 6-speed (Town & Country, Journey, Avenger) constantly throws P0700 alongside solenoid-pack codes — the integra…
- 2006-2010Chrysler/Dodge with the 62TE 6-speed (Town & Country, Journey, Avenger) constantly throws P0700 alongside solenoid-pack codes — the integrated TCM-on-the-valve-body design cooks itself from heat soak, and Chrysler's TSB 21-014-11 covers the solenoid-pack/TCM replacement as a single unit (around $450-700 part).
- 2004-2008Ford F-150/Expedition with the 4R75E pairs P0700 with P0715/P0720 from corroded transmission harness connectors at the case pass-through — pop the connector, look for green fuzz on the pins, clean and dielectric-grease before condemning anything inside.
- 2007-2013GM trucks with the 6L80/6L90 (Silverado, Tahoe, Yukon) throws P0700 with internal-mode-switch codes when the TEHCM (integrated TCM in the pan) fails; GM service bulletin recommends fluid + filter + TEHCM as a package.
- 2003-2009Toyota with the U660E/A750 trans (Camry V6, Highlander, Sienna) rarely throws P0700 unless something serious has happened — Toyota TCM logic is conservative.
Estimated repair$150 (connector cleanup + relearn) to $4,500+ (full rebuild if fluid was burnt at intake).
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P0700 — frequently asked
What does a P0700 code mean?
General transmission system fault — a companion code should also be set to indicate the specific issue.
What causes a P0700 code?
Common causes: Low trans fluid; Failed solenoid; Wiring issue; Internal transmission damage.
What are the symptoms of a P0700 code?
Typical symptoms: Check engine light; Transmission warning light; Rough shifting; Limp mode.
Is it safe to drive with a P0700 code?
Not for long. Driving on this one risks further damage. Get it to a shop rather than carrying on with it. Estimated repair: $100-$3,500.
How do I diagnose a P0700 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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