What Does P1739 Mean?
The tiptronic or manual shift mode upshift circuit is shorted to ground. This affects vehicles with manual shift capability in automatic transmissions. A ground short prevents proper upshift signal recognition.
Common Causes
35%
Damaged shifter wiring harness rubbing on metal causing short
30%
Faulty tiptronic upshift switch or button internal short
20%
Water intrusion or corrosion in shifter connector
10%
Damaged wiring under center console or shifter boot
5%
Transmission control module input circuit fault
Diagnostic Steps
1
Step 1: Inspect shifter area and center console for liquid spills or damage to wiring
2
Step 2: Remove shifter trim and inspect wiring harness for chafing or shorts to ground
3
Step 3: Test tiptronic upshift switch resistance and circuit continuity with multimeter
4
Step 4: Check for proper voltage at switch connector when switch is activated
5
Step 5: Repair or replace damaged wiring; replace tiptronic switch if internally shorted
Estimated Repair Cost
$100 - $400
Parts + labor, varies by vehicle and location
The tiptronic or manual shift mode upshift circuit is shorted to ground. This affects vehicles with manual shift capability in automatic transmissions. A ground short prevents proper upshift signal recognition.
The most common cause of P1739 (Tiptronic Switch up Circ. Short to Ground) is: Damaged shifter wiring harness rubbing on metal causing short
Typical repair costs for P1739 range from $100 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Manual shift mode may not function properly but automatic mode typically remains operational. Primarily a convenience issue with minimal safety impact.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1739 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Manufacturer
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