Code
C1507
HYUNDAI
C — Chassis
Accel Switch
Views:
UK: 10
EN: 34
RU: 16
AI status
Completed
Completed
100%
Causes
- Damaged or corroded accelerator/pedal switch
- Open or shorted wiring between pedal switch and control module
- Poor connector contact or bent terminal pins
- Water intrusion or contamination at pedal sensor/connector
- Blown fuse or poor power/ground to pedal/sensor
- Faulty engine/vehicle control module (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) may be lit
- Reduced or erratic throttle response; possible limp mode
- Cruise control disabled
- Vehicle may hesitate or refuse to accelerate normally
- Pedal position readouts in scan tool are out of range or jumpy
What to check
- Read stored and pending DTCs with a compatible scan tool; record freeze frame and live data
- Inspect pedal area: connector, wiring harness routing, clips, and for signs of rubbing or damage
- Visually inspect connectors for corrosion, bent pins, water ingress, or loose terminals
- Verify fuses and relays supplying the pedal sensor/system
- Observe live accelerator/pedal switch/pedal position sensor values while operating the pedal
- Perform wiggle test on harness and connector while watching live data for intermittent faults
Signal parameters
- Reference supply: typically 5 V reference from control module (check vehicle spec)
- Signal at rest: ~0.5–1.0 V (varies by design)
- Signal at full travel: ~4.0–4.5 V (varies by design)
- Open-circuit: OL or near 0 V / inconsistent reading
- Short-to-battery: ~5 V constant; short-to-ground: ~0 V constant
- Correlation: dual sensors (if present) should track each other within manufacturer tolerance
Diagnostic algorithm
- Connect scan tool; record C1507 and any related codes, freeze frame, and live data for pedal/switch
- Clear codes and attempt to reproduce fault while watching live data
- Perform visual inspection of pedal assembly, connector, and harness for damage or contamination
- With ignition ON (engine off), verify 5 V reference and ground at pedal connector using a multimeter
- Backprobe signal wire and operate pedal; confirm signal voltage changes smoothly from low to high and returns at idle
- If voltages are out of range, check continuity from pedal connector to control module and inspect for shorts to ground/battery
- If wiring and power/ground are good, bench-test or replace the accelerator switch/pedal assembly per service manual and re-test
- If fault remains after replacement, test/replace the vehicle control module as a last resort (follow manufacturer module replacement and programming procedures)
- After repairs, clear codes and perform road test to confirm repair
Likely causes
- Broken or frayed harness near pedal (mechanical wear)
- Intermittent connector due to corrosion or loose latch
- Short to battery or ground from chafed wire
- Failed accelerator switch inside pedal assembly
- Faulty reference 5V supply or ground at module
Fault status
Status
Accelerator/pedal switch circuit malfunction detected by the control module. Signal is out of expected range, intermittent, open, or shorted.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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