What Does P1795 Mean?
DTC P1795 indicates a problem with the throttle position sensor input circuit as received by the Transmission Control Module. The TCM uses TPS data to determine shift timing and firmness, and this code means the signal is absent, erratic, or out of expected range. The transmission may default to a fixed shift schedule or enter limp mode.
Common Causes
30%
Faulty wiring or connector between the TPS and TCM
25%
Defective throttle position sensor
20%
Corroded or damaged TCM connector pins for the TPS circuit
15%
CAN bus communication error between PCM and TCM
10%
Failed TCM internal input circuit
Diagnostic Steps
1
Check for concurrent PCM throttle position codes (P0120–P0124); if present, address those first as the root cause.
2
Using a scan tool, compare the TPS reading seen by the PCM to the TPS reading seen by the TCM while slowly opening the throttle; they should track identically.
3
Inspect the wiring and connectors on the dedicated TPS signal wire running to the TCM for breaks, corrosion, or shorts.
4
Back-probe the TPS signal wire at the TCM connector and verify it sweeps smoothly from approximately 0.5V (closed) to 4.5V (wide open).
5
If the TPS signal is correct at the TCM connector, suspect internal TCM failure on the input buffer circuit.
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
DTC P1795 indicates a problem with the throttle position sensor input circuit as received by the Transmission Control Module. The TCM uses TPS data to determine shift timing and firmness, and this code means the signal is absent, erratic, or out of expected range. The transmission may default to a f...
The most common cause of P1795 (Throttle Position Input circuit to TCM) is: Faulty wiring or connector between the TPS and TCM
Typical repair costs for P1795 range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Without accurate throttle input, the transmission may shift at inappropriate times or with excessive firmness, potentially causing jerky driving or unintended acceleration characteristics.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1795 to identify the root cause.
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Powertrain
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Transmission
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