What Does P1722 Mean?
The automatic transmission diagnostic input signal is reading higher than expected voltage. This typically relates to a transmission range sensor or diagnostic circuit used during self-test procedures.
Common Causes
35%
Short to power in transmission diagnostic circuit wiring
30%
Faulty transmission range sensor or neutral safety switch
20%
Failed transmission control module or internal circuit fault
15%
Damaged connector pins causing short circuit at TCM
Diagnostic Steps
1
Step 1: Inspect transmission control module connector for bent pins, corrosion, or moisture intrusion
2
Step 2: Disconnect transmission range sensor and measure voltage at TCM diagnostic input pin
3
Step 3: Check wiring harness for chafing, pinching, or routing near hot exhaust components
4
Step 4: Test transmission range sensor resistance values in all gear positions per service manual specifications
5
Step 5: If all circuits test normal, suspect internal TCM failure and consider replacement or reprogramming
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
The automatic transmission diagnostic input signal is reading higher than expected voltage. This typically relates to a transmission range sensor or diagnostic circuit used during self-test procedures.
The most common cause of P1722 (Auto Trans Diagnosis Input Signal High Input) is: Short to power in transmission diagnostic circuit wiring
Typical repair costs for P1722 range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May prevent transmission from shifting properly or cause vehicle not to start due to safety interlock issues. Could result in unexpected transmission behavior.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1722 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission Control
Difficulty
Type
Manufacturer
Recommended Tools
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