What Does P1772 Mean?
The throttle position signal circuit to the TCM has a short to voltage or ground. This causes incorrect transmission operation due to false throttle position readings.
Common Causes
45%
Wiring harness chafed or pinched causing short to ground or power
30%
Failed throttle position sensor with internal short circuit
15%
Water intrusion in connectors causing short circuit
10%
Transmission control module internal short circuit
Diagnostic Steps
1
Step 1: Disconnect TPS connector and check if code clears; if so, TPS is likely shorted internally
2
Step 2: Inspect wiring harness routing for pinch points, especially near moving parts or heat sources
3
Step 3: Measure resistance between TPS signal wire and ground, and between signal wire and voltage supply
4
Step 4: Check for water intrusion or corrosion in all connectors along the circuit
5
Step 5: If wiring and TPS test good, suspect TCM internal fault
Estimated Repair Cost
$150 - $750
Parts + labor, varies by vehicle and location
The throttle position signal circuit to the TCM has a short to voltage or ground. This causes incorrect transmission operation due to false throttle position readings.
The most common cause of P1772 (Throttle Position Sensor Circuit Shorted to Transmission Control Module) is: Wiring harness chafed or pinched causing short to ground or power
Typical repair costs for P1772 range from $150 to $750, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Transmission may shift erratically or enter limp mode. Vehicle is generally safe to drive but may exhibit poor performance and fuel economy.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1772 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control System
Difficulty
Type
Manufacturer
Recommended Tools
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