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Error Code P1700 – Symptoms, Causes and Solutions

So your Nissan’s dashboard shows everyone’s least favorite visitor: the light. “check engine”. If the diagnostic device reads P1700is a power train error that means “Undetermined Transmission Failure.” Specifically, this occurs when the car has failed to neutralize or is defective in neutral.


More about Error Code P1700

The car’s transmission adapts the engine’s power to the drive wheels. In internal combustion engines, operation at a relatively high rotational speed is necessary, which is unsuitable for slow travel, starting and stopping.

The transmission reduces the highest number of revolutions of the engine at lower wheel revolutions, thus increasing engine torque in the process.

The transmission is usually connected to the engine crankshaft via a clutch or fluid coupling. Its output is transmitted through the driveshaft to one or more differentials that drive the wheels.

Reads: Error Code P1130 – Air/Fuel Ratio Sensor Range/Malfunction Bank 1 Sensor 1 (Toyota, Lexus)

Although a differential also provides downshifting, its primary function is to allow the wheels at each end of an axle to rotate at different speeds, which is necessary to prevent wheel slip during turns.

The PCM (Powertrain Control Module) Continuously monitors the TCM (transmission control module). In the event that the TCM detects an internal transmission problem, the trouble code will be set. P1700 OBDII diagnostic.


If you have had the diagnosis code OBD-II P1700, In a manual transmission Nissan, you’ve probably heard or felt a grinding noise in neutral. If the sound improves with the clutch depressed, there is likely major transmission damage.

If your vehicle is automatic or there are no noticeable signs other than the dashboard light, there is a greater chance that only a minor part of the transmission is damaged.


The code P1700 has a reputation for revealing two outcomes: either the transmission has massive problems and needs major repairs or a complete replacement, or there is something wrong and the car needs its transmission flushed and a general tune-up to run better and clear the trouble code. diagnosis.

How to wash a transmission

See what you need and follow the next steps.

Tools needed:

  • Jack and jack stands, or ramps
  • Screwdriver
  • Wrench
  • Socket
  • Drain Bucket: 5+ Gallon Capacity
  • Transmission fluid
  • Tunnel

Step 1: Vehicle Preparation

  • Get everything together and ready before you start – this is not a job you are going to want to leave and come back to, that would risk contamination.
  • Lift your vehicle into the air, safely. Do this only on a flat, paved surface.

Step 2: Drain the liquid

  • Remove the transmission dipstick
  • Locate where the transmission cooler lines enter the radiator and place your drain bucket underneath
  • Loosen the transmission cooler hose clamps and pull them back, removing the transmission cooler

Step 3: Cycle the liquid

  • Now you need to put the funnel on the dipstick tube and have the fluid ready
  • Start your car and notice how liquid begins to gush out at this point.
  • Quickly add 9 to 12 quarts of transmission fluid through the funnel

Step 4: Filling the Transmission Backup

  • Replace the transmission cooler
  • Lower your vehicle to the ground
  • Add up to 3 quarts of fluid while the vehicle is running – watch the dipstick reading for the exact amount, adding half a quart at a time

Please note that the transmission flush It is a somewhat controversial practice in the automotive world. However, if you are receiving this code and not others, it is likely that your fluid is contaminated and needs to be flushed and replaced.

Questions and answers

Q: Here’s a tough one- I have a 1996 C220 with an automatic transmission. Using an OBD reader to find out a check engine light showed a code P1700. I read a CD manual and found that the problem could be a faulty switching valve or an out-of-adjustment control pressure cable.

The cable fit seemed fine. Therefore, I replaced the switching valve, but the Check Engine it turned on again. I put the car on a lift to inspect the Vacuum Control Valve which is connected to the driver’s side of the transmission.

I found that the hose coming from the switching valve had come loose from the vacuum control valve (modulating pressure valve?). I reconnected the hose, cleared the code, and for the first time, the OBD sensor showed no stored faults.

However, about 1 month later the Check Engine light came on again, and the P1700 code appeared. My guess is that it is the Vacuum Control Valve (it is the same as the Modulating Pressure Valve).

I don’t think there’s much point in testing the valve because it’s probably broken, and I don’t have the special equipment to test it anyway. Has anyone else encountered similar problems, and if so what is the most common cause (apart from loose pipe) that causes a P1700 code on a C220?

A: Sorry I can’t help, I can only sympathize as I’m having the same reading..

I just bought a ’94 C220 and had it towed 816 miles and now when I start the car there is the red light. CHECK ENGINE and the red SRS lights are on.

After driving it for a while the red SRS light goes off and then after a bit more the red check engine light goes off and then there is a yellow ABS light that comes on and then the speedometer stops working.

This lasts a little bit and then the check engine lights and MR come back on (resulting in the speedometer working and the yellow ABS light going off). This process is repeated. Also, when the car is running and I am stopped the car shakes slightly.

Reading the diagnostic code only gave me the code P1700 (I guess I was expecting more of a code). I’ve read on the internet about the upshift delay switch valve but I’m really not sure and after putting on new tires, doing an oil change, and everything since I bought the car I’m a little strapped for money.


Thank you…

If you want to know other articles similar to Error Code P1700 – “Undetermined Transmission Failure” you can visit the category Fault Codes.


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