Transmission Gear Shift Control Range Performance Problem
The transmission is not shifting properly due to a range performance issue.
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What it means (plain English)
The computer is not detecting the correct gear being selected based on inputs from the shifter and sensors, which may lead to incorrect shifting or no shifting at all.
What the computer is actually seeing
The ECM expects to see a correlation between the gear position sensor and the actual clutch or transmission input signals, often within a specific voltage range.
What a healthy reading looks like
Voltage levels from the gear position sensor should generally be between 0.5V (Park) and 4.5V (Drive), or a defined resistance based on gear position.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the transmission fluid level and condition. Ensure it's within the manufacturer's specifications and free of contaminants. Decision: Is fluid normal? Yes: Go to step 2. No: Top off or replace fluid and retest.
- 22. Inspect the wiring and connectors between the gear position sensor and the ECM. Look for signs of damage, corrosion, or loose connections. Decision: Is wiring intact? Yes: Go to step 3. No: Repair or replace damaged wiring and retest.
- 33. Test the gear position sensor with a multimeter. Check the voltage output in each gear position. Expected voltage should align with manufacturer specifications. Decision: Does the sensor output the correct voltage? Yes: Go to step 4. No: Replace the gear position sensor and retest.
- 44. If the previous steps are fine, check the transmission control module for error codes and its operational status. Decision: Is the TCM functioning properly? Yes: Further diagnosis needed. No: Replace the TCM and retest.
Common causes
- Faulty gear position sensor
- Wiring issues or shorts in harness
- Problems with the transmission control module (TCM)
- Transmission fluid contamination or low fluid level
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive if the transmission is not shifting properly as it can lead to further damage.
Will this code come back after clearing?
If the underlying issue isn't fixed, the code will likely return.
Why does this code appear with other transmission codes?
Transmission issues often have cascading effects; a problem with one part can trigger faults in others.
Working a real vehicle right now?
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