What Does P1625 Mean?
The accelerator pedal position sensor channel 2 has lost its 5-volt reference voltage supply from the PCM. This redundant sensor circuit failure confirms an electrical issue in the APP sensor system.
Safety Warning
Vehicle will enter limp mode with no throttle response or idle-only operation. Creates severe safety hazard in traffic. Do not drive until repaired.
Common Causes
35%
Failed accelerator pedal position sensor assembly affecting both channels
30%
Damaged wiring harness or connector with multiple circuit faults
20%
Short to ground in 5V reference circuit affecting channel 2 supply
10%
Severe corrosion or water intrusion in sensor connector affecting multiple pins
5%
PCM internal voltage regulator failure for sensor reference circuits
Diagnostic Steps
1
Step 1: Disconnect APP sensor connector and measure 5V reference voltage for channel 2 at harness side with key on
2
Step 2: Check for short to ground on both channel 1 and channel 2 reference voltage wires with sensor disconnected
3
Step 3: Inspect sensor connector thoroughly for contamination, corrosion, or physical damage to terminals
4
Step 4: Compare voltage readings between channel 1 and channel 2 reference circuits to identify if issue is sensor-side or PCM-side
5
Step 5: If both channels show voltage supply issues, check PCM connector and grounds; if isolated to one channel, replace APP sensor
Estimated Repair Cost
$180 - $950
Parts + labor, varies by vehicle and location
The accelerator pedal position sensor channel 2 has lost its 5-volt reference voltage supply from the PCM. This redundant sensor circuit failure confirms an electrical issue in the APP sensor system.
The most common cause of P1625 (Pedal Position Sensor Potentiometer Supply Channel 2 Electrical) is: Failed accelerator pedal position sensor assembly affecting both channels
Typical repair costs for P1625 range from $180 to $950, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle will enter limp mode with no throttle response or idle-only operation. Creates severe safety hazard in traffic. Do not drive until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1625 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control
Difficulty
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