P2135Throttle Actuator Control

Throttle/Pedal Position Sensor A/B Voltage Correlation

P2135 means the two throttle position sensors (or throttle vs pedal) disagree beyond an allowed range, so the ECM cannot trust the throttle signal and often forces reduced-power limp mode.

🚗 Not recommended. This code can trigger limp mode and unpredictable throttle response.

HIGH

severity

🎯 Top Causes, Ranked by Likelihood

#1Failing throttle position sensor / throttle body$120-$500

45%

Worn TPS tracks inside the electronic throttle body are the most common cause.

#2Wiring or connector fault at the throttle body$50-$300

30%

Corroded pins or chafed wiring cause intermittent correlation faults.

#3Poor ground or ECM reference voltage issue$50-$400

15%

Check the 5V reference and sensor grounds before replacing parts.

#4Faulty ECM$200-$1200

10%

An internal ECM fault can misread the two sensor signals.

🩺 Common Symptoms

Reduced power / limp mode
Check engine light
Erratic or unresponsive throttle
Rough or surging idle
Possible stalling

💰 Repair Cost: DIY vs Shop

DIY Cost

$60-$500

Shop Cost

$200-$800

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P2135

1Read live data for both TPS/APP signals and watch for a mismatch

2Inspect the throttle body connector and wiring for damage

3Test the 5V reference and ground circuits

4Clean or replace the throttle body and relearn idle

❓ Frequently Asked Questions

Can I drive with a P2135 code?

Avoid it. P2135 often puts the car in limp mode with reduced power, which is unsafe in traffic. Diagnose it promptly.

How much does it cost to fix P2135?

A throttle body or TPS replacement typically runs $200-$800 at a shop, or $60-$500 in parts if you DIY.

Will P2135 cause limp mode?

Yes. Because the ECM cannot trust the throttle signal, it commonly forces reduced-power limp mode as a safety measure.

🔗 Related Codes

P2138P2122P2127P0121P0221