What Does P1796 Mean?
DTC P1796 indicates the vehicle speed signal circuit has a short to ground condition. The TCM or PCM has detected that the vehicle speed signal wire is being pulled to ground potential when it should be providing a varying frequency signal. This prevents the transmission from knowing how fast the vehicle is moving, causing incorrect shift points and possible limp mode.
Safety Warning
Loss of vehicle speed signal causes the transmission to shift incorrectly, the speedometer to read zero, and ABS/traction control to potentially malfunction, creating a significant driving hazard.
Common Causes
35%
Chafed or pinched vehicle speed sensor wiring shorting to chassis ground
25%
Failed vehicle speed sensor with internal short
20%
Damaged connector with moisture intrusion on the VSS circuit
10%
Short to ground in the instrument cluster or other module sharing the VSS signal
10%
TCM internal input circuit fault
Diagnostic Steps
1
Disconnect the vehicle speed sensor and measure resistance between the signal wire and ground at the TCM connector; infinite resistance expected (no continuity to ground).
2
If the short persists with the sensor disconnected, section-test the wiring harness to isolate the shorted segment.
3
Inspect the VSS wiring along its routing path for chafing against brackets, exhaust components, or transmission housing edges.
4
Check the VSS connector at the transmission for moisture, bent pins, or corrosion.
5
If wiring is intact, measure the VSS sensor resistance and compare to specification; replace if internally shorted.
Estimated Repair Cost
$80 - $500
Parts + labor, varies by vehicle and location
DTC P1796 indicates the vehicle speed signal circuit has a short to ground condition. The TCM or PCM has detected that the vehicle speed signal wire is being pulled to ground potential when it should be providing a varying frequency signal. This prevents the transmission from knowing how fast the ve...
The most common cause of P1796 (Vehicle Speed Signal Circ. Short to Ground) is: Chafed or pinched vehicle speed sensor wiring shorting to chassis ground
Typical repair costs for P1796 range from $80 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Loss of vehicle speed signal causes the transmission to shift incorrectly, the speedometer to read zero, and ABS/traction control to potentially malfunction, creating a significant driving hazard.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1796 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission / Vehicle Speed
Difficulty
Type
Manufacturer
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