P2750 code definition
When the powertrain control module (PCM) receives an input signal from intermediate shaft speed sensor C that is incorrect in any way, it will record the P2750 code and turn on the Check Engine Light.
What the P2750 code means
The PCM relies on a number of factors to provide an accurate and effective shifting strategy, among which is the input from the intermediate shaft speed sensors. If any of these sensors gives a bad, intermittent, or erratic signal, the PCM will not be able to determine the proper shifting strategy, and a code will be recorded. Code P2750 refers to sensor C.
What causes the P2750 code?
There are a few problems that can trigger a P2750 code, including:
- A faulty output speed sensor
- A faulty input speed sensor
- A faulty intermediate shaft speed sensor
- Open, shorted, or damaged wiring harness, circuit, or connector(s)
- A faulty shift solenoid
- A faulty engine drivability sensor
- Contaminated or old transmission fluid
- A faulty valve body
- A faulty PCM (rare)
What are the symptoms of the P2750 code?
In addition to the Check Engine Light illuminating, the vehicle’s shifting may be delayed and/or harsh.
How does a mechanic diagnose the P2750 code?
After identifying the P2750 code and any related codes that the PCM has stored, the mechanic will begin with a visual inspection of all related parts and components. Starting with the wiring and connections, they’ll eliminate potential underlying causes for the code being stored, starting with the simplest, and moving on to more complex and expensive fixes. After each test and/or repair, they’ll clear all codes, restart the engine, and take the vehicle for a test drive to see if the code is resolved.
Common mistakes when diagnosing the P2750 code
Most commonly, the person attempting to diagnose the problem will make the mistake of assuming that it’s an issue with the engine misfiring, the fuel delivery system malfunctioning, or the vehicle speed malfunctioning. Another common misdiagnosis is the assumption that there’s something wrong with the internal workings of the transmission.
How serious is the P2750 code?
If your PCM is unable to deliver the proper shifting strategy, it can affect the drivability of your vehicle, as well as its fuel efficiency. Engine stalls and/or inappropriate shifts can also put you in potentially dangerous situations, as well.
What repairs can fix the P2750 code?
Depending on what’s actually causing the code to be stored, a range of repairs may resolve it, including:
- Replacing or repairing the input speed sensor.
- Replacing or repairing the output speed sensor.
- Replacing or repairing intermediate shaft speed sensor C.
- Flushing and replacing the transmission fluid
- Replacing the shift solenoid
- Replacing or repairing the engine drivability sensor
- Replacing or reprogramming the PCM (rare)
Additional comments for consideration regarding the P2750 code
Even if your transmission is not making erratic shifts, appearing to misfire, and/or stalling while driving or idling, the P2750 code is indicative of a potentially serious problem that should not be left unresolved. Furthermore, if you do not resolve this issue, the Check Engine Light will remain on, which will mean that your vehicle cannot legally pass an OBD-II emissions test, making it impossible to renew your registration.
Need help with a P2750 code?
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