C1750 — Accelerator Position Sensor Out of Range

Is it safe to drive with C1750?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

What are the symptoms of C1750?

Drivers most often notice: the affected system operates intermittently or not at all, possible limp mode depending on the affected component, increased fuel consumption in some cases, Check Engine Light on.

What is the most common cause of C1750?

The most common causes are: corroded, loose or damaged connector, poor ground connection, faulty sensor or actuator of the affected circuit.

Will C1750 clear itself?

Sometimes C1750 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What does OBD2 code C1750 mean?

OBD2 code C1750 flags a problem with the sensor and actuator circuits (accelerator position sensor out of range). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, poor ground connection, faulty sensor or actuator of the affected circuit.

When your vehicle's engine control module decides something is wrong with the accelerator position sensor circuit, it logs trouble code C1750. This specific OBD2 code points to a situation where the signal from the sensor falls outside the expected voltage range the module has programmed. In plain terms, the data the ECU is receiving from the throttle or accelerator position sensor doesn't match what it should see under the current operating conditions.

C1750 falls within the chassis-related diagnostic trouble codes, which typically cover issues outside the engine itself — things like braking, steering, and suspension components. The accelerator position sensor plays a role beyond just measuring pedal travel; it tells the ECU how much driver input is being requested, which directly affects throttle response, fuel delivery, and in some cases, transmission shifting behavior. When the module detects that the sensor's signal is erratic, missing, or reading out-of-range for a sustained period, it triggers C1750. The key point here is that this code does not set on a single bad reading. The module waits for the fault condition to repeat under specific operating conditions before it activates the check engine light and stores the code. The freeze frame data captured alongside C1750 — engine load, RPM, coolant temperature, and vehicle speed — pinpoints exactly when and under what circumstances the problem appeared. That information is critical when you replicate the fault during diagnosis.

Symptoms of C1750

The way C1750 manifests varies depending on which circuit within the accelerator position sensor system is affected and how severely it has failed. Most drivers notice one or more of the following:

• The affected system operates intermittently, or stops working entirely, depending on which sensor or actuator circuit is involved.
• Some vehicles enter a limp mode, limiting engine power and speed to protect drivetrain components until the issue is resolved.
• In certain cases, increased fuel consumption occurs because the engine management system cannot accurately read driver demand.
• The check engine light or a dedicated warning indicator illuminates on the instrument cluster.
• Throttle response feels sluggish or unpredictable, particularly under heavier acceleration.
• In rare instances, the vehicle may hesitate or stumble during acceleration.

Common Causes

Before assuming the accelerator position sensor itself has failed, work through the simpler and more frequent culprits. The most likely explanations for C1750 include:

• A poor or corroded ground connection at the sensor or the ECU, causing erratic signal readings.
• An open circuit — a broken wire — or a short to ground or power somewhere in the wiring harness feeding the sensor.
• A corroded, loose, or physically damaged connector that cannot maintain a reliable electrical connection.
• A blown fuse or a circuit that has lost power supply voltage.
• Wiring insulation worn through from heat, chafing, or road debris, leading to intermittent shorts.
• The accelerator position sensor itself reaching the end of its service life and producing out-of-range readings.

How to Diagnose C1750

Proper diagnosis requires a systematic approach, starting with stored data and working outward toward the physical components. Follow these steps:

1. Connect an OBD2 scanner to the vehicle's diagnostic port, verify that C1750 is present, and record all freeze frame data. This snapshot shows engine load, RPM, coolant temperature, and vehicle speed at the exact moment the fault was detected.
2. Scan for additional trouble codes. Related codes in the C0xxx range often point to the root cause — a short in an adjacent circuit, for example — and should be investigated alongside C1750. Check manufacturer technical service bulletins for your specific make and model, as many sensor-related faults have documented factory fixes or software calibrations.
3. Perform a thorough visual inspection of the wiring harness and connectors associated with the accelerator position sensor. Look for damaged insulation, corroded terminals, broken locking tabs, and any signs of moisture intrusion.
4. With the connector unplugged, measure reference voltage, ground resistance, and signal continuity at the component side of the harness. Compare your readings against manufacturer specifications.
5. Conduct a wiggle test on the harness while monitoring live data on your scanner. Any dropouts or sudden signal loss indicate a broken wire or loose connection that is sensitive to movement.
6. After clearing C1750, drive the vehicle through a complete drive cycle — including conditions matching the freeze frame data — and verify that the code does not return.

Repair Options and Costs

Tackle the most accessible and affordable fixes before committing to expensive part replacements. Typical repair scenarios for C1750, priced at independent shop labor rates in USD:

• Repair damaged wiring or replace corroded connectors in the sensor circuit: $80–$250
• Replace the faulty accelerator position sensor or related actuator component: $150–$500
• Control module diagnosis and repair when the ECM/PCM itself is at fault: $300–$1,000

The overall cost to resolve C1750 typically falls between $80 and $1,000, depending on which component is responsible. An accurate diagnosis before purchasing parts makes a significant difference — the most expensive scenario is rarely the first one you should check.

Driving Safety Verdict

In most vehicles equipped with this code, the car remains drivable. You may experience reduced throttle response or a limped performance mode, but the engine continues running. However, if C1750 is accompanied by stalling, failure to start, or warnings related to braking or steering systems, treat the situation as urgent and have the vehicle inspected immediately. Address the underlying fault at your earliest convenience to avoid being stranded or compromising safety-critical systems.

Related OBD2 Codes

• C1700: Left Rear Sensor Circuit Failure
• C1701: Left Rear Sensor Circuit Fault
• C1702: RightRear Sensor Circuit Short to Vbat
• C1703: Right Rear Sensor Circuit Failure
• C1704: Right Rear Sensor Circuit Fault
• C1705: Left Rear Center Sensor Circuit Short to Vbat