P2136

Throttle/Pedal Position Sensor/Switch A/C Voltage Correlation

Q: 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.

Q: 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.

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.

Real-world scan data

Seen in

124

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Appears alongside · share of P2136 scans

P2133in 43.5% of scans

P2135in 42.7% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P2136 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX