Accelerator Pedal Position Sensor 1 Failure
Issues detected with Accelerator Pedal Position Sensor 1.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The accelerator pedal position sensor sends a signal to the engine control unit that indicates how far you are pressing the accelerator. If it's faulty, the computer can't properly regulate the engine's power output.
What the computer is actually seeing
The engine control unit expects a voltage between 0.5V (minimum pedal position) and 4.5V (maximum pedal position) from the accelerator pedal position sensor. If the signal is outside this range or absent, it will trigger a fault code.
What a healthy reading looks like
The expected output voltage from the accelerator pedal position sensor should be between 0.5V and 4.5V when the pedal is pressed.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check the wiring and connectors at the accelerator pedal position sensor for damage or corrosion. If found, repair or replace as needed. Decision: If wiring is good, go to step 2.
- 2Measure the voltage output from the accelerator pedal position sensor with the key on and engine off. Confirm output between 0.5V and 4.5V with the pedal at rest. If not, replace the sensor. Decision: If voltage is correct, go to step 3.
- 3Check the throttle control module for any fault codes or failures that could affect the accelerator pedal input. Decision: Clear codes and retest. If SPN 3708 returns, consider replacing the accelerator pedal position sensor.
Common causes
- Faulty accelerator pedal position sensor
- Damaged wiring or connectors to the sensor
- Malfunction in the throttle control system
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive with this code, as it may lead to unintended acceleration behavior.
Will this fault code come back after clearing?
Yes, if the underlying issue isn't fixed, the code will likely return after a short drive.
Why does this code seem to pair with SPN 3709?
SPN 3709 also relates to accelerator pedal position, indicating multiple issues with the pedal or related systems.
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