CarFaultIQ

P2135

P2135: Throttle/Pedal Position Voltage Correlation

Updated Last reviewed December 26, 2026By CarFaultIQ Editorial Team

Verify with official recall databases, service records, a mechanic inspection, and local market data before relying on this summary.

At a glance

Quick diagnostic answer

The throttle and pedal position signals disagree with each other.

SeverityHigh UrgencyUrgency not yet verified EvidenceSource notes available
OBD code
P2135
System/category
Fuel & Air Metering
Severity
High
Structured severity term
Urgency
Urgency not yet verified
Can I drive?
Drive only to a repair shop
Best driven only to a repair shop if throttle response is predictable; tow it if it surges, stalls, or will not accelerate normally.
Repair/cost band
$$$ · Major
Can range from a sensor or connector repair to a throttle-body or pedal assembly repair, so diagnose before approving parts.
Vehicle applicability
Generic OBD-II code across many makes and models; confirm service information for the exact vehicle.
Current applicability note is free text

Computed rule output may be more cautious than stored content and is never used to soften safety-critical risks.

Short answer

P2135 usually means the throttle and pedal position signals disagree with each other. Best driven only to a repair shop if throttle response is predictable; tow it if it surges, stalls, or will not accelerate normally. Check for reduced-power messages and inspect throttle-body and pedal connectors before replacing either assembly.

SeverityHighDrive?Drive only to a repair shopRepairProfessional

Key takeaways

  • P2135 points to a detected condition, not an automatic parts order.
  • Best driven only to a repair shop if throttle response is predictable; tow it if it surges, stalls, or will not accelerate normally.
  • Check for reduced-power messages and inspect throttle-body and pedal connectors before replacing either assembly.
  • Use scan data and a visual inspection before replacing sensors.

At a glance

Question Short answer Next move
Can I drive? Best driven only to a repair shop if throttle response is predictable; tow it if it surges, stalls, or will not accelerate normally. Keep trips short if it runs normally; stop if symptoms get worse.
Likely cost Can range from a sensor or connector repair to a throttle-body or pedal assembly repair, so diagnose before approving parts. Get a written diagnosis before buying parts.
Check first Check for reduced-power messages and inspect throttle-body and pedal connectors before replacing either assembly. Start with the cheap visible checks.

Can I still drive with this?

Drive only to a repair shop

Best driven only to a repair shop if throttle response is predictable; tow it if it surges, stalls, or will not accelerate normally.

SeverityHigh

High

Diagnostic flow

  1. What it meansThe throttle and pedal position signals disagree with each other.
  2. Check this firstScan for related throttle and pedal codes.
  3. Likely causeThrottle-body sensor fault
  4. Can you drive?Drive only to a repair shop

P2135 is one of the throttle codes to take seriously. The computer is comparing two position signals and they do not agree.

That can trigger reduced power, poor acceleration, or a throttle response that does not feel normal. In traffic, that is more than annoying.

Check for reduced-power messages and inspect throttle-body and pedal connectors before replacing either assembly.

Structured DTC reference

What P2135 means

The two throttle position signals disagree

A trouble code identifies the circuit or monitored condition that failed its test. It does not, by itself, identify the failed part or prove the same cause on every vehicle.

Cause categories to discriminate

  • Sticking throttle
  • Throttle sensor reading wrong

These are structured diagnostic hypotheses, not a parts-replacement list. Vehicle context, symptoms, operating conditions, and test results determine which remain supported.

Severity and drivability

The code alone is not enough to assign one universal severity or “safe to drive” answer. Stop driving for loss of braking or steering, severe overheating, oil-pressure loss, a fuel leak or fire risk, or any rapidly worsening safety symptom.

Add the symptom contextChoose the vehicle

What it means

The throttle and pedal position signals disagree with each other.

Common symptoms

  • Reduced power message
  • Hesitation or no acceleration
  • Check-engine light
  • Possible stalling

Likely causes

  • Throttle-body sensor fault
  • Accelerator pedal sensor fault
  • Connector or wiring problem
  • Throttle body needing relearn or replacement

Diagnosis steps

  1. Scan for related throttle and pedal codes.
  2. Inspect the throttle-body connector and wiring.
  3. Inspect the pedal-position sensor connector.
  4. Compare sensor A and B voltages with service information.

What a mechanic should check

A mechanic should compare both throttle/pedal signal tracks and inspect wiring before replacing a throttle body or pedal assembly.

Vehicle applicability

Generic OBD-II code across many makes and models; confirm service information for the exact vehicle.

Repair actions / cost band

$$$ · Major

Can range from a sensor or connector repair to a throttle-body or pedal assembly repair, so diagnose before approving parts.

P2135 — vehicles with official records naming this code

P2135 is named in NHTSA-published manufacturer communications or investigations for 50 vehicle families, including:

A code named in a manufacturer communication means the document refers to it for those vehicles. It is not a diagnosis of any car, and it does not mean the code is common on that vehicle.

Frequently asked questions

What does P2135 mean?

the throttle and pedal position signals disagree with each other.

Is P2135 safe to drive with?

Best driven only to a repair shop if throttle response is predictable; tow it if it surges, stalls, or will not accelerate normally.

What should I check first?

Check for reduced-power messages and inspect throttle-body and pedal connectors before replacing either assembly.

Continue exploring

Related codes

Known faults that trigger this code

Related symptoms

Keep going

Next diagnostic step

Check warning lights Use the dashboard light to decide what to do now. Trace the symptom Match what you can see, hear, smell, or feel. Find vehicle coverage Check model-year problem windows and related faults.

Source & evidence notes

  • What this is based on: generic OBD-II code references, EPA OBD background, and standard diagnostic practice.
  • This page is not based on complaint counts, repair-cost averages, or CarFaultIQ owner submissions.
  • Sources used: CarParts P2135 reference; KBB P2135 reference; US EPA OBD background.
  • URLs: https://www.carparts.com/blog/p2135-code-throttle-pedal-position-sensor-switch-a-b-voltage-correlation/; https://www.kbb.com/obd-ii/p2135/; https://19january2021snapshot.epa.gov/state-and-local-transportation/vehicle-emissions-board-diagnostics-obd_.html.
  • Confirm the exact diagnosis with live scan data, the owner manual, or service information for the specific vehicle.