OBD-II Car P0700 Error
What it means
P0700 is a generic 'informational' code meaning the transmission control module (TCM) has detected a malfunction somewhere in the transmission control system and has requested the engine computer turn on the check engine light. Importantly, P0700 itself does not tell you the specific problem — it is a pointer that one or more transmission-specific codes (often P07xx/P08xx) are stored in the TCM. Typical symptoms include the check engine light, harsh or delayed shifts, gear slipping, and the vehicle dropping into 'limp mode' (locked in one gear, limited RPM) to protect the transmission.
The bottom line on the P0700 error
P0700 is not a specific fault — it is the transmission computer flagging that a deeper sub-code is stored, and because it can involve internal transmission damage this is not a DIY job. Replacing parts off P0700 alone is guessing; pull the companion code first, then take this to a qualified technician.
The safe, cheap step is to have the sub-code read and check the transmission fluid level. Beyond that — solenoids, valve body, or a rebuild reaching $2,000–$5,000+ — belongs with a specialist. Do not keep driving in limp mode or while slipping; it can turn a small fix into total failure.
P0700 snapshot
Our own at-a-glance triage of the P0700 error, from the verified data on this page. See error-code rankings → · How we score →
Common causes of the P0700 error
- An underlying transmission fault code stored in the TCM (P0700 is just the flag for it)
- Faulty transmission control module (TCM) or its wiring/connectors
- Low, burnt, or contaminated transmission fluid
- Failing shift solenoids or valve-body problems
- Faulty transmission speed/input/output sensors
- Internal mechanical wear in the transmission (worn clutches, metal debris)
Which OBD-II cars get the P0700 error
P0700 is a generic transmission-control flag that can appear on any vehicle with an electronically controlled automatic transmission, but it is reported frequently on Dodge/Chrysler/Jeep, Ford, GM, and Nissan/Infiniti models with higher mileage. Because it only points to a stored TCM sub-code, the underlying fault — and its severity — varies enormously by make and model.
How to fix the OBD-II Car P0700 error
- 1Read the companion (sub) codesP0700 alone is not actionable. Use a scan tool capable of reading transmission/TCM codes (a basic reader often shows only P0700). The accompanying codes — for example a specific shift-solenoid or speed-sensor code — tell you the real fault. Always start here before replacing anything.
- 2Check transmission fluid level and conditionLow, dark, or burnt-smelling fluid causes many transmission faults. Inspect the level per the manufacturer's procedure (some are sealed/no-dipstick units). Top off or service the fluid and filter with the exact specified fluid type; the wrong fluid can itself cause shift problems.
- 3Inspect wiring and connectorsCorroded or loose connectors at the TCM, solenoid pack, or transmission sensors commonly trigger control-system faults. Check for damaged harnesses, water intrusion, and poor grounds before condemning expensive internal parts.
- 4Address the specific failed componentBased on the sub-code, repair the identified part — a shift solenoid, speed sensor, valve body, or the TCM. Internal mechanical failures may require a transmission rebuild or replacement, which is professional-level work.
🧰 When to call a professional
Strongly consider a professional or transmission specialist for P0700. Pulling the manufacturer-specific sub-codes, diagnosing valve bodies/solenoids, and any internal transmission repair require dealer-level tools and expertise. See a pro right away if the car is in limp mode, slipping badly, or shifting harshly — continued driving can cause further, costly damage.
OBD-II P0700 vs OBD-II P0300 vs OBD-II P0420: how they compare
How this code stacks up against related error codes for difficulty, urgency, and cost.
| OBD-II P0700 | OBD-II P0300 | OBD-II P0420 | |
|---|---|---|---|
| DIY difficulty (1–5) | 4 | 3 | 3 |
| Urgency (1–5) | 4 | 4 | 2 |
| Typical cost | $$$ | $$ | $$$ |
How much does it cost to fix the P0700 error?
| DIY parts only | $50–$400 |
| Professional diagnosis & repair | $75–$1,000 |
| If major component | $2,000–$5,000+ |
Repair or replace?
This is the code where the repair-or-replace decision matters most, because the cost swings from a $100 fluid service or a $200–$500 shift solenoid all the way to a $2,500+ transmission rebuild. Always pull the companion sub-code before spending a cent — a large share of P0700 cases turn out to be a cheap sensor, solenoid, or fluid fix once the real fault is known. If diagnosis points to internal mechanical failure, weigh a rebuild against the value of the car; on an older, high-mileage vehicle a full replacement may not be worth it. Do not keep driving in limp mode or while slipping, as that can turn a small fix into a total failure.
Common replacement parts for the P0700 error
| Transmission fluid & filter service | $100–$250 | First step if fluid is low or burnt | |
| Speed/input/output sensor | $50–$200 | Common, inexpensive sub-code fix | |
| Shift solenoid / solenoid pack | $200–$500 | Frequent cause of shift faults | |
| Transmission control module (TCM) | $500–$1,000+ | Varies widely with programming |
Prices are typical retail ranges and vary by model and supplier — always confirm the exact part number for your appliance before buying. We are not linking parts for this code on purpose: it is a job for a qualified technician, and the right fix here starts with a diagnosis, not a purchase.
OBD-II P0700 error — FAQ
＋ − Is it safe to drive with this code?
Drive with caution and only briefly. Many vehicles enter 'limp mode' with P0700, locking into one gear (often 2nd or 3rd) and limiting speed to protect the transmission — that is meant for getting somewhere safely, not extended driving. If the transmission is slipping, overheating, or shifting violently, stop and have it towed; pushing it can turn a sensor fix into a full transmission failure.
＋ − How much does it cost to fix?
It depends entirely on the underlying sub-code. A speed sensor or fluid service may be $150–$500. Shift solenoids or a valve body can run $400–$1,000+. A TCM replacement varies widely with programming. If the transmission needs a rebuild or replacement, costs commonly reach $2,000–$5,000 or more. Accurate diagnosis of the companion code is essential before spending money.
＋ − Why does my scanner only show P0700 and nothing specific?
Basic OBD-II readers often only read generic engine (powertrain) codes and cannot access the deeper transmission/TCM codes that explain the actual fault. P0700 is simply the TCM telling the engine computer to light the dashboard. You need a scan tool with transmission/manufacturer-specific capability (or a shop) to retrieve the codes that pinpoint the problem.
Sources & manufacturer references
This guide is independently written and not affiliated with OBD-II. Always unplug appliances before servicing and follow your model's manual. Error codes and steps can vary by model — when in doubt, consult a qualified technician.