What Does C1750 Mean?
The accelerator position sensor (APS/TPS) is reporting a voltage signal outside its expected operating range. This sensor tells the ECM how far the driver has pressed the accelerator pedal, and an out-of-range reading means the signal is either too high, too low, or erratic. This can cause limp mode, reduced power, or unpredictable throttle response.
Safety Warning
Vehicle may enter limp mode with severely reduced power or exhibit unpredictable throttle response. Do not drive until repaired — sudden loss of acceleration in traffic is dangerous.
Common Causes
35%
Faulty accelerator pedal position sensor with worn internal resistive element
25%
Damaged or corroded wiring harness between APS and ECM
20%
Poor ground connection at the APS sensor or ECM
15%
Failed 5V reference supply from ECM
5%
Water intrusion into the pedal assembly connector
Diagnostic Steps
1
Step 1: Monitor APS voltage with the scan tool while slowly pressing the pedal from idle to WOT — expect a smooth 0.5V to 4.5V sweep with no dropouts or jumps.
2
Step 2: Backprobe the 5V reference wire at the APS connector with a DVOM — confirm a steady 5.0V +/- 0.1V with key on, engine off.
3
Step 3: Check the ground circuit at the APS connector — should read less than 0.1 ohm resistance to a known good chassis ground.
4
Step 4: Wiggle-test the APS wiring harness while monitoring live data for signal dropouts or erratic readings.
5
Step 5: If wiring checks pass, replace the accelerator pedal position sensor assembly, clear codes, and verify smooth voltage sweep through full pedal travel.
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
The accelerator position sensor (APS/TPS) is reporting a voltage signal outside its expected operating range. This sensor tells the ECM how far the driver has pressed the accelerator pedal, and an out-of-range reading means the signal is either too high, too low, or erratic. This can cause limp mode...
The most common cause of C1750 (Accelerator Position Sensor Out of Range) is: Faulty accelerator pedal position sensor with worn internal resistive element
Typical repair costs for C1750 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may enter limp mode with severely reduced power or exhibit unpredictable throttle response. Do not drive until repaired — sudden loss of acceleration in traffic is dangerous.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1750 to identify the root cause.
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Quick Info
Category
Chassis
System
Electronic Throttle Control
Difficulty
Type
Manufacturer
Recommended Tools
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