OBD-II Code P0700 — What It Means & How to Fix It

What Does This Error Mean?

P0700 means the Transmission Control Module (TCM) has detected a problem and stored a trouble code. This is an informational code — it tells you to look at the transmission codes for the real problem. Think of P0700 as an alarm bell saying something is wrong with the transmission system. You need to read the transmission-specific codes to find out what is actually broken. Do not ignore this code — transmission problems can get much worse and more expensive if left alone.

Affected Models

All vehicles with automatic transmissions 1996+
Common in Dodge Ram and Chrysler vehicles
Common in Nissan Altima and Maxima (CVT)
Common in Chevrolet Impala and Malibu
Common in Jeep Grand Cherokee

Common Causes

Transmission solenoid failure causing shifting problems
Low or dirty transmission fluid affecting hydraulic pressure
Faulty transmission speed sensor sending incorrect data
Wiring problem between the TCM and transmission components
Internal transmission mechanical failure such as worn clutch packs

How to Fix It

Use an OBD-II scanner that can read transmission codes (not just engine codes). Many basic scanners only read engine codes. You need the transmission-specific code to know what is actually wrong.

Advanced scanners that read all modules cost $50 to $150. Some auto parts stores will scan for free.
Check the transmission fluid level and condition. With the engine running and warmed up, pull the dipstick. The fluid should be pink or light red. Dark brown or black fluid with a burnt smell indicates a problem.

Some newer vehicles do not have a dipstick. Check your owner's manual for the correct fluid check procedure.
If the fluid is low, top it off with the exact type specified in your owner's manual. Using the wrong transmission fluid can cause serious damage. If the fluid is dark and burnt, a fluid change may help.

Never overfill transmission fluid. Too much fluid causes foaming and shifting problems.
Check the transmission wiring harness connector. It is usually located on the side of the transmission. Look for corrosion, damaged pins, or a connector that has come loose from vibration.

Transmission connectors are exposed to road spray and can corrode over time, especially in snowy climates.
If the transmission-specific code points to a solenoid, speed sensor, or other component, address that specific issue. P0700 will clear automatically once the underlying transmission code is resolved.

Do not clear P0700 without fixing the underlying cause. It will return immediately.

When to Call a Professional

P0700 often points to transmission issues that require specialized knowledge and equipment. A transmission diagnostic scan costs $50 to $150. Solenoid replacement ranges from $200 to $600. If internal mechanical damage is found, transmission rebuild costs $1,500 to $3,500. Full transmission replacement runs $2,500 to $5,000. Get a proper diagnosis before authorizing expensive repairs.

Frequently Asked Questions

Is P0700 serious?

Yes, P0700 should be taken seriously. It means the transmission system has a problem that needs diagnosis. Driving with a transmission problem can cause further damage and turn a $300 repair into a $3,000 one. Get the specific transmission codes read as soon as possible.

Can I drive with P0700?

It depends on how the transmission is behaving. If shifting feels normal, you can drive carefully to a shop. If you feel harsh shifting, slipping, or the transmission stays in one gear, minimize driving. Some vehicles go into limp mode, which limits speed but protects the transmission.

Why does my scanner show P0700 but no other codes?

Your scanner probably only reads engine codes, not transmission codes. P0700 is stored in the engine computer as a flag that says check the transmission. The actual problem code is stored in the Transmission Control Module. You need a scanner that can read TCM codes to find the real issue.