Throttle/pedal position sensor A/B voltage correlation
The controller detected disagreement between redundant throttle-position or pedal-position signals beyond its allowed relationship.
Conditions that can produce P2135
These are diagnostic branches, not a ranked parts list. Prevalence and testing order depend on the exact vehicle and failure scene.
- Throttle-position tracks disagree
- Pedal-position tracks disagree
- 5-volt reference or sensor-ground problem
- Connector fretting, water, or harness damage
- Throttle body mechanical or internal fault
What to inspect next
- Do not rely on a vehicle with unpredictable or reduced throttle response
- Identify whether the definition applies to throttle or pedal tracks on the exact vehicle
- Graph both redundant signals through a controlled sweep
- Test reference, ground, terminals, and harness before replacement
Evidence that strengthens the answer
Verify the repair
Preserve the pre-repair record, document exactly what changed, then repeat the relevant operating condition safely. Confirm no current or pending fault returns, review permanent-code and readiness state where applicable, and state which tests or modules remained unavailable.
This page explains a commonly standardized code at a general level. Confirm the exact definition, module, status, test conditions, thresholds, wiring, and service process for the vehicle application using current official information.