P2AD3 code meaning
Throttle/Pedal Position Sensor/Switch A/G Voltage Correlation
Powertrain system Generic code P2Axx codes Check engine light
What P2AD3 means
P2AD3 compares tracks A and G. In GM's 2023 scheme A is the first sensor of the bank 1 throttle body and G the second sensor of the bank 2 unit, so the pair links both throttles of a V engine and can reveal that one plate is not where the other suggests. Mercedes-Benz is the documented user: on M177 V8s from the 2015 AMG C63 to the 2025 Maybach GLS 600, P2AD300 reads as an implausible relation between the A and G position values. Bulletin LI07.10-P-080384 already listed it in version 2 (May 2026) and blames raised contact resistance in the connectors M16/60 and M16/61 of the two throttle actuators. When P2135 or P2136 are stored alongside, a shared cause in the connectors is more likely than two failed throttles.
P2AD3 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor1 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2AD3
- Check engine light on
- Possible loss of power or emergency throttle mode
Common causes of P2AD3
- Most likelyRaised contact resistance in the connectors of both throttle actuators
- PossibleOne throttle body with a faulty position sensor
- Less likelyFault on a shared sensor supply or ground
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Throttle position sensorThrottle position sensor gECM
What each part of P2AD3 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| A | Area: hybrid propulsion. |
| D3 | The exact fault in that area. |
What to do next
- Note P2AD3 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2AD3
What does P2AD3 mean?
P2AD3 means "Throttle/Pedal Position Sensor/Switch A/G Voltage Correlation". P2AD3 compares tracks A and G. It is a generic code, so it means the same on every make.
Is it safe to drive with P2AD3?
Drive gently and only to a workshop. With P2AD3 the car can go into limp mode (reduced power) to protect itself.
Will P2AD3 fail an emissions test?
Yes, it can. P2AD3 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2AD3 to fix?
Difficulty: medium. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P2AD3 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.