P1783 2022 GMC Sierra Code - Input Speed Sensor Direction Not Plausible Forward
Quick Answer
The P1783 code indicates that the Input Speed Sensor (ISS) is reporting a signal that is not consistent with expected values when the vehicle is in forward gear. Common causes include Faulty Transmission Input Speed Sensor, Open or shorted wiring in the Transmission Input Speed Sensor harness, Poor electrical connection in the Transmission Input Speed Sensor circuit. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1783 2022 GMC Sierra indicates Input Speed Sensor Direction Not Plausible Forward.
- Common causes
- Common causes include Faulty Transmission Input Speed Sensor, Open or shorted wiring in the Transmission Input Speed Sensor harness, Poor electrical connection in the Transmission Input Speed Sensor circuit.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P1783 2022 GMC Sierra Description
The P1783 code indicates that the Input Speed Sensor (ISS) is reporting a signal that is not consistent with expected values when the vehicle is in forward gear. The ISS is a critical component in the transmission system, as it measures the speed of the primary pulley and communicates this information to the Transmission Control Module (TCM). The TCM uses the data from the ISS to manage various functions, including line pressure, shift patterns, and the operation of the Torque Converter Clutch (TCC). When the TCM detects that the voltage from the ISS exceeds 4.75 volts for a duration of 0.8 seconds, it triggers the P1783 code.
Common Causes of P1783 2022 GMC Sierra
- Faulty Transmission Input Speed Sensor
- Open or shorted wiring in the Transmission Input Speed Sensor harness
- Poor electrical connection in the Transmission Input Speed Sensor circuit
- Defective Control Solenoid Valve Assembly
- Faulty Transmission Control Module (TCM)
Symptoms of P1783 2022 GMC Sierra
- Engine Light ON (or Service Engine Soon Warning Light)
- Erratic or harsh shifting between gears
- Transmission slipping or failing to engage properly
- Decreased fuel efficiency
- Unusual engine RPM fluctuations during driving
How to Fix P1783 2022 GMC Sierra
- Perform a visual inspection of the Input Speed Sensor and its wiring harness for damage or corrosion.
- Test the Input Speed Sensor using a multimeter to check for proper voltage and signal output.
- If the sensor is faulty, replace the Input Speed Sensor with a new one.
- Inspect and repair any damaged wiring or poor connections in the sensor circuit.
- Clear the diagnostic trouble codes and perform a road test to ensure the issue is resolved.
Cost to Fix P1783 2022 GMC Sierra
The cost to diagnose and repair the P1783 code typically ranges from $150 to $600, depending on the specific issue and whether parts need to be replaced. The Input Speed Sensor itself may cost between $50 and $150, while labor charges can vary significantly based on location, make/model, and engine type, with most shops charging between $80 to $150 per hour. Dealerships may charge higher rates, while independent shops might offer more competitive pricing.
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