What Does P1624 Mean?
The accelerator pedal position sensor channel 1 has lost its 5-volt reference voltage supply from the PCM. This indicates an electrical problem in the sensor power circuit.
Safety Warning
Vehicle will enter limp mode with severely reduced power or may not accelerate at all. Engine may only idle. Creates dangerous driving condition and potential for being struck from behind.
Common Causes
35%
Damaged wiring or connector at accelerator pedal position sensor module
30%
Failed accelerator pedal position sensor assembly with internal circuit failure
20%
Short to ground in 5V reference circuit causing PCM to shut down voltage supply
10%
Corroded terminals or moisture intrusion in sensor connector
5%
PCM internal voltage regulator failure for sensor reference circuit
Diagnostic Steps
1
Step 1: Disconnect APP sensor connector and measure 5V reference voltage at harness side with key on
2
Step 2: Check for short to ground on reference voltage wire with sensor disconnected using ohmmeter
3
Step 3: Inspect sensor connector for bent pins, corrosion, or moisture and clean/repair as needed
4
Step 4: Measure APP sensor reference voltage at sensor pins with connector attached during wiggle test
5
Step 5: If voltage is present and stable, replace APP sensor assembly; if voltage is missing or unstable, repair harness or replace PCM
Estimated Repair Cost
$180 - $900
Parts + labor, varies by vehicle and location
The accelerator pedal position sensor channel 1 has lost its 5-volt reference voltage supply from the PCM. This indicates an electrical problem in the sensor power circuit.
The most common cause of P1624 (Pedal Position Sensor Potentiometer Supply Channel 1 Electrical) is: Damaged wiring or connector at accelerator pedal position sensor module
Typical repair costs for P1624 range from $180 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle will enter limp mode with severely reduced power or may not accelerate at all. Engine may only idle. Creates dangerous driving condition and potential for being struck from behind.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1624 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control
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