What Does P1733 Mean?
The Tiptronic or manual shift mode downshift switch circuit is shorted to ground. This prevents the transmission control module from receiving proper downshift requests from the steering wheel or shifter-mounted paddle or switch.
Common Causes
40%
Damaged wiring harness with insulation worn through to ground
30%
Failed Tiptronic downshift switch with internal short
15%
Corroded or moisture-damaged switch connector
10%
Damaged clock spring assembly (for steering wheel mounted switches)
5%
Transmission control module internal fault
Diagnostic Steps
1
Step 1: Disconnect Tiptronic downshift switch and check if short to ground clears at harness side
2
Step 2: Inspect wiring from switch through clock spring (if steering wheel mounted) for damage
3
Step 3: Test switch resistance in pressed and unpressed positions per specifications
4
Step 4: Check switch connector for moisture, corrosion, or pushed-back pins
5
Step 5: Trace circuit from switch to TCM looking for pinched or chafed wiring
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The Tiptronic or manual shift mode downshift switch circuit is shorted to ground. This prevents the transmission control module from receiving proper downshift requests from the steering wheel or shifter-mounted paddle or switch.
The most common cause of P1733 (Tiptronic Switch Down Circ. Short to Ground) is: Damaged wiring harness with insulation worn through to ground
Typical repair costs for P1733 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Manual downshift function will not work, but automatic transmission operation remains normal. Safe to drive with reduced manual control convenience.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1733 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission / Manual Shift Control
Difficulty
Type
Manufacturer
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