P2135: Throttle/Pedal Position Sensor A/B Voltage Correlation
Electronic throttles use two position sensors that should always agree. They don't, so the computer limits power for safety.
Green, yellow, red: three ways P2135 can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Set once, power is normal.
Schedule a repair
Occasional limp mode. Replace or repair soon; it will get worse.
Stop and get help
Stuck in reduced power and can't keep up with traffic. Pull over and get help.
Symptoms you might notice
- Reduced power or limp mode
- Throttle feels dead
- Check engine and possibly traction lights
Common causes, cheapest first
- Worn sensor inside the throttle body
- Dirty or failing electronic throttle body
- Corroded connector
- Wiring damage
What you can check before calling
- Check the throttle body connector
- Note if it happens more in wet weather
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
Related codes
More engine sensors codes
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P2135 mean?
P2135 means "Throttle/Pedal Position Sensor A/B Voltage Correlation". Electronic throttles use two position sensors that should always agree. They don't, so the computer limits power for safety.
Can I drive with code P2135?
It depends on what the vehicle is doing. Green: Set once, power is normal. Yellow: Occasional limp mode. Replace or repair soon; it will get worse. Red: Stuck in reduced power and can't keep up with traffic. Pull over and get help.
What causes P2135?
The most common causes are: worn sensor inside the throttle body; dirty or failing electronic throttle body; corroded connector.
Is P2135 a serious code?
It can be. Stuck in reduced power and can't keep up with traffic. Pull over and get help.
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