What it means
The transmission control module detects that the intermediate shaft speed sensor A signal is outside its expected range or does not match expected performance.
At a glance
- Usually lights the check-engine light
How it works
Intermediate shaft speed sensor A reports the intermediate shaft's rotation speed to the TCM for shift-slip calculations and torque converter control. This range/performance code sets when a signal is present but its speed or behavior falls outside the expected range or does not agree with other transmission data.
Common causes
Most likely first.
- Aged Hall element with reduced amplitude
- Sensor element aged beyond calibration window
- Sensor mounting loose - signal damping
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
How to diagnose it
- Save freeze-frame data and compare sensor A's live speed with other transmission speed readings during the gear and conditions that set the code.
- Inspect intermediate shaft speed sensor A for secure mounting and check its connector and wiring for damage, looseness, or contamination.
- Check the sensor A circuit and signal quality using the manufacturer's procedure to distinguish a weak or distorted signal from a wiring fault.
- Verify sensor A's mounting and air gap, where applicable, against the manufacturer's specification.
- If the circuit and mounting are correct, test sensor A and compare its output with the manufacturer's specification before replacing it.
Common fixes
- Secure sensor A and correct its mounting or air gap if out of specification.
- Repair a loose, corroded, or damaged sensor A connector or wiring.
- Replace intermediate shaft speed sensor A if its signal remains outside specification.
- Address a confirmed transmission condition affecting shaft speed only after sensor and circuit checks.
Can I keep driving?
Drive gently and avoid towing or hard acceleration until diagnosed, since inaccurate shaft-speed data can disrupt shift and torque converter control. Stop if you experience slipping, shuddering, or unpredictable shifts.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.