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

What is P2135?

P2135 is a high-severity powertrain code indicating the throttle/pedal position sensors A and B are reporting conflicting voltage readings, which can cause drivability issues and trigger limp mode. This code appears most frequently in Ford Mustangs and Chevrolet Silverados based on owner reports. The average repair cost is $1,312, ranging from $8 to $905, with DIY repairs attempted in only 1% of cases.

Common Causes

• ●Faulty throttle position sensor (most common cause based on diagnostic patterns)
• ●Wiring harness damage or corrosion in sensor circuits
• ●Failed accelerator pedal position sensor
• ●Internal throttle body malfunction

Symptoms You May Notice

• ●Reduced engine power or limp mode activation
• ●Check engine light illumination with possible traction control light
• ●Erratic throttle response or hesitation during acceleration
• ●Engine stalling or rough idle

How to Fix It

• ●Replace throttle position sensor assembly ($200-$600, moderate difficulty)
• ●Repair or replace damaged wiring harness ($150-$400, moderate difficulty)
• ●Replace accelerator pedal position sensor ($100-$300, moderate difficulty)
• ●Replace entire throttle body assembly ($400-$900, moderate difficulty)