Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation
There’s a mismatch between throttle position sensor outputs A and B.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The computer compares two sensors that tell it how far the gas pedal is pressed. If these sensors don’t agree, it assumes there's a problem and triggers a code.
What the computer is actually seeing
The Engine Control Module (ECM) monitors two throttle position sensors (TPS); when their voltage outputs differ significantly (usually more than 0.3 volts under similar conditions), it sets this code.
What a healthy reading looks like
Both TPS signals should ideally range between 0.5 V (at rest) and 4.5 V (fully pressed) and should correspond closely.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check the throttle body for carbon buildup or wear, clean if necessary.
- 2Inspect the wiring and connectors leading to the TPS for damage or corrosion.
- 3Using a multimeter, check the voltage from TPS A and B with the ignition on but engine off. Both should be between 0.5 V and 4.5 V.
- 4If voltages are correct, check for continuity in circuit between the TPS and ECM.
- 5Replace faulty TPS sensors if misalignment or inconsistent voltage is detected, unless wiring is the issue.
Common causes
- Dirty or faulty throttle body
- Wiring issues or damaged connectors
- Faulty throttle position sensors
- Air intake leaks or restrictions
- ECM software issues
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, it's not safe. This code can cause the vehicle to enter limp mode, reducing power.
Will this code come back after a repair?
If it’s properly diagnosed and repaired, it shouldn’t return unless there’s another underlying issue.
Why does this code show up with other codes?
There’s often a failure in the throttle position system that triggers multiple errors simultaneously.
Working a real vehicle right now?
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