P2136
Throttle/Pedal Position Sensor/Switch A/C Voltage Correlation
Throttle / pedal position
Generic OBD-II
Low
What it means
P2136 means the "A" and "C" throttle or pedal position sensor signals no longer agree with each other. These sensors are paired so the ECM can cross-check them; when their voltages fail to correlate, the ECM stops trusting the throttle input and usually forces reduced power or limp mode until the fault is repaired.
Low
Can I keep driving? Drivable but limited — when two throttle/pedal sensors disagree the ECM usually forces reduced-power or limp mode, so throttle response stays weak until it is fixed.
Common symptoms
What you'll notice
- Check-engine light on, often with a reduced-power or wrench warning
- Reduced power output, sometimes limp mode
- Poor or erratic throttle response and hesitation
- Unstable idle
Common causes
Most likely first
- Faulty throttle/pedal position sensor (the A or C element disagreeing)Likely
- Open or shorted sensor wiring harnessCommon
- Poor electrical connection or corrosion at the sensor connectorCommon
- Dirty or carbon-filled throttle bore skewing one signalLess often
- Faulty ECM (least likely)Less often
How to diagnose & fix
Work through it in order
- With the key on and engine off, check the sensor connectors for a steady 5-volt reference and a good ground on both circuits.
- Inspect the sensor wiring and connectors for damage, corrosion, or loose pins.
- On a scan tool, compare the A and C signals through the full sweep — they should track together in a fixed relationship.
- Clean the throttle bore if carbon buildup is affecting one signal.
- Replace the throttle/pedal position sensor if the two elements will not correlate, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2136?+
For short trips only. Because the ECM cannot trust the throttle signal, it may cap power. Have it diagnosed before relying on the car.
Can I just clear P2136?+
It clears, but the moment the two sensor signals disagree again the code and limp mode return. Fix the sensor or wiring first.
Related codes
Often seen with P2136
Read & clear P2136 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX