What Does P2124 Mean?
The PCM has detected an intermittent or erratic signal from accelerator pedal position sensor 'D'. This indicates a loose connection, intermittent wiring fault, or sensor failure that causes the signal to drop out or fluctuate unexpectedly.
Safety Warning
Vehicle may experience sudden throttle cut-out, unexpected limp mode activation, or erratic acceleration response. Highly dangerous to drive due to unpredictable behavior; immediate repair essential.
Common Causes
40%
Loose, corroded, or intermittently failing connector at pedal sensor
30%
Intermittent wiring fault such as broken wire strands or chafed insulation
25%
Failing accelerator pedal position sensor with intermittent internal fault
5%
PCM connector issue causing intermittent sensor input
Diagnostic Steps
1
Step 1: Perform wiggle test on pedal sensor connector and wiring harness while monitoring sensor 'D' voltage on scan tool; note any signal dropouts
2
Step 2: Inspect connector for corrosion, loose pins, moisture, or poor terminal tension; clean and secure as needed
3
Step 3: Check wiring harness routing for areas of potential chafing, pinching, or stress; inspect insulation carefully
4
Step 4: Monitor sensor 'D' output voltage over an extended test period including temperature changes and vehicle vibration conditions
5
Step 5: Replace accelerator pedal position sensor if intermittent fault cannot be isolated to wiring or connectors
Estimated Repair Cost
$100 - $700
Parts + labor, varies by vehicle and location
The PCM has detected an intermittent or erratic signal from accelerator pedal position sensor 'D'. This indicates a loose connection, intermittent wiring fault, or sensor failure that causes the signal to drop out or fluctuate unexpectedly.
The most common cause of P2124 (Throttle/Pedal Position Sensor/Switch "D" Circuit Intermittent) is: Loose, corroded, or intermittently failing connector at pedal sensor
Typical repair costs for P2124 range from $100 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may experience sudden throttle cut-out, unexpected limp mode activation, or erratic acceleration response. Highly dangerous to drive due to unpredictable behavior; immediate repair essential.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2124 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control
Difficulty
Type
Generic (SAE)
Recommended Tools
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