Nissan MM B2301 Code:

OBD-II Diagnostic Body (B) Trouble Code

Trouble In Nissan MM B2301 Possible Cause

The most likely cause of Nissan MM B2301 code being stored is a defective automatic transmission cooler control valve or valve position sensor. Other causes may include corroded, open, or shorted wiring or connectors, a loose control module ground strap, or broken ground wire.

Common Symptoms For Nissan MM B2301

  1. On most models the sensor either threads directly into the transmission housing or is mounted to the exterior of the transmission housing using bolts
  2. Engine and transmission ground cables, straps, and wires are sometimes left dangling after repairs are performed
  3. A suitable OBD-II scanner (or code reader), a digital volt/ohmmeter, and an oscilloscope will be most helpful in performing a successful diagnosis
  4. There are several tools which will be instrumental in attempting to successfully diagnose the conditions which contribute to this code being stored

Similar Problems

Fuel And Air Metering (Injector Circuit Malfunctions Only)
Control Module Throttle Actuator Position Performance
Cruise Vehicle Speed/Set Speed Difference Too High

Nissan MM B2301 Troubleshooting

Having one of the signs of a bad gasket is usually not enough to prove a failure of a gasket, but multiple symptoms are most likely the result of gasket failure. It is advisable to have the vehicle driven as little as possible whenever the symptoms occur. Depending on the symptoms, either have the gasket replaced or repaired.
The cost of replacing a gasket usually varies from one mechanic to the other. Replacing a gasket is quite expensive in modern engines due to their location and the amount of labor that is required to replace them. Nissan MM B2301 OBD2 reports a sensor fault, replacement of the sensor is unlikely to resolve the underlying problem. The fault is most likely to be caused by the systems that the sensor is monitoring, but might even be caused by the wiring to the sensor itself.

How to turn off Nissan MM B2301 check engine light ?

There are two ways to turn off the check engine light:

A repair technician can do so once repairs have been made.
The OBD II can automatically turn it off when it fails to detect the problem after several diagnostic cycles.

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