What Does P1736 Mean?
The transmission control module has detected a malfunction in the second gear position switch circuit. This switch verifies second gear engagement. A circuit fault prevents proper gear position confirmation and transmission control.
Common Causes
40%
Defective second gear pressure switch or position sensor
25%
Wiring harness damage or corroded connector at switch
20%
Low or contaminated transmission fluid affecting pressure
10%
Internal valve body or second gear clutch pack issues
5%
TCM internal circuit failure
Diagnostic Steps
1
Step 1: Verify transmission fluid level and inspect for contamination or burning smell
2
Step 2: Inspect wiring and connectors to second gear pressure switch for physical damage
3
Step 3: Test second gear switch resistance and voltage output per specifications
4
Step 4: Use scan tool data to monitor switch status during gear changes and operation
5
Step 5: Replace second gear pressure switch if electrical testing shows fault
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
The transmission control module has detected a malfunction in the second gear position switch circuit. This switch verifies second gear engagement. A circuit fault prevents proper gear position confirmation and transmission control.
The most common cause of P1736 (Second Gear Switch Circuit Malfunction) is: Defective second gear pressure switch or position sensor
Typical repair costs for P1736 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause improper shifting, transmission limp mode, or inability to use certain gears. Can result in unexpected transmission behavior during driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1736 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Manufacturer
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